Preparation Methods of Nanoparticles: Energy Related Applications

**77**

**Chapter 5**

**Abstract**

Ultrasound-Assisted Preparation

Methods of Nanoparticles for

Energy-Related Applications

*Christos Vaitsis, Maria Mechili, Nikolaos Argirusis,* 

*Antonis Zorpas and Christos Argirusis*

*Eirini Kanellou, Pavlos K. Pandis, Georgia Sourkouni,* 

Ultrasound (US) technology is already into the research field providing a powerful tool of producing nanomaterials or being implicated in decoration procedures of catalyst supports for energy applications and material production. Toward this concept, low or/and high-frequency USs are used for the production of nanoparticles, the decoration of catalytic supported powders (carbon-based, titania, and alumina) with nanoparticles, and the production of metal-organic frameworks (MOFs). MOFs are porous, crystalline materials, which consist of metal centers and organic linkers. Those structures demonstrate high surface area, open metal sites, and large void space. All the above produced materials are used in heterogeneous catalysis, electrocatalysis, photocatalysis, and energy storage. Batteries and fuel cells are popular systems for electrochemical energy storage, and significant progress has been made in nanostructured energy materials in order to improve these storage devices. Nanomaterials have shown favorable properties, such as enhanced kinetics

and better efficiency as catalysts for the oxygen reduction reaction (ORR).

**Keywords:** ultrasound, sonochemistry, nanomaterials, batteries, fuel cells,

which depends on the nature of the liquid and the US frequency.

Over the last decades, sonochemistry has been a fast developing branch of chemistry, which revolves around the ultrasound (US) effect and acoustic cavitation. USs include frequencies above the audible limit of human hearing (20 kHz). The effects of high-energy US arise from the acoustic cavitation rather than interactions of acoustic waves and matter at a molecular or atomic level. The pressure fluctuations generated by US in a liquid medium lead to the formation, growth, and implosive collapse of bubbles. More specifically, the liquid continuously expands (negative pressure) and compresses (positive pressure) until it reaches a critical diameter,

The collapse of the bubble is almost an adiabatic process, and it results in a massive buildup of energy within the bubble. The microscopic bubbles can also collapse near the surface of the solid substrate and activate it, split larger particles to smaller

photocatalysis, metal-organic frameworks

**1. Introduction: sonochemistry**

### **Chapter 5**

## Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications

*Christos Vaitsis, Maria Mechili, Nikolaos Argirusis, Eirini Kanellou, Pavlos K. Pandis, Georgia Sourkouni, Antonis Zorpas and Christos Argirusis*

### **Abstract**

Ultrasound (US) technology is already into the research field providing a powerful tool of producing nanomaterials or being implicated in decoration procedures of catalyst supports for energy applications and material production. Toward this concept, low or/and high-frequency USs are used for the production of nanoparticles, the decoration of catalytic supported powders (carbon-based, titania, and alumina) with nanoparticles, and the production of metal-organic frameworks (MOFs). MOFs are porous, crystalline materials, which consist of metal centers and organic linkers. Those structures demonstrate high surface area, open metal sites, and large void space. All the above produced materials are used in heterogeneous catalysis, electrocatalysis, photocatalysis, and energy storage. Batteries and fuel cells are popular systems for electrochemical energy storage, and significant progress has been made in nanostructured energy materials in order to improve these storage devices. Nanomaterials have shown favorable properties, such as enhanced kinetics and better efficiency as catalysts for the oxygen reduction reaction (ORR).

**Keywords:** ultrasound, sonochemistry, nanomaterials, batteries, fuel cells, photocatalysis, metal-organic frameworks

### **1. Introduction: sonochemistry**

Over the last decades, sonochemistry has been a fast developing branch of chemistry, which revolves around the ultrasound (US) effect and acoustic cavitation. USs include frequencies above the audible limit of human hearing (20 kHz). The effects of high-energy US arise from the acoustic cavitation rather than interactions of acoustic waves and matter at a molecular or atomic level. The pressure fluctuations generated by US in a liquid medium lead to the formation, growth, and implosive collapse of bubbles. More specifically, the liquid continuously expands (negative pressure) and compresses (positive pressure) until it reaches a critical diameter, which depends on the nature of the liquid and the US frequency.

The collapse of the bubble is almost an adiabatic process, and it results in a massive buildup of energy within the bubble. The microscopic bubbles can also collapse near the surface of the solid substrate and activate it, split larger particles to smaller

ones or deagglomerate nanoparticles. Other than the elevated temperature and pressure, those localized hotspots can result in powerful cavitation-generated shock waves and microjets, which can cause effective stirring/mixing of the adjusted layer of liquid [1, 2].

The first region is the interior of the bubble itself, which can be visualized as a micro-/nano-reactor, dictated by extreme temperature (>5000 K) and pressure conditions (>1000 atm) along with rapid heating/cooling rates (1010 K/s). The second one is the interface between the bubble and the bulk solvent. The reaction efficiency of nonvolatile solutes depends on their hydrophobicity, which determines their ability to accumulate at the gas-liquid interface [3]. The third region is the vicinity of the bubble, where the bulk solution is at ambient temperature, and free radicals can form in the hot regions.

### **2. Batteries**

As the globe encounters constant rise of energy demand to survive, the need to exploit efficiently renewable energy sources is vital. Electrochemical energy production can be a promising power source, while electrochemical devices constitute an energy storage option as well. Among these devices, batteries possess commensurate attention the last decades, due to their various applications and potential [4].

A battery cell, regardless its shape and configuration, is a device consisted of two electrodes, the anode and the cathode, an electrolyte between them having the role of the ionic conductor and a separator positioned between the electrodes that converts chemical energy to electricity or the reverse if the cell is rechargeable. Thus, the performance of the cell depends on the properties of all the components and the consistency of the system [5]. Τhe current challenges are to advance the energy density of batteries, extend their conversion efficiency and rechargeability, and eliminate the charging time and cost while meeting the safety and environmental standards [5, 6].

In this direction, research has been emphasized toward developing nanostructured materials and implementing them in batteries as they deliver enriched performance, which is unapproachable by conventional materials. Some crucial aspects about nanomaterials are their large electrochemically active surface area, their electronic and ionic conductivity, thermal and mechanical endurance, and flexibility [7, 8]. In order to ameliorate redox reaction rates and accelerate kinetic mechanisms, a wide range of methods have been proposed including the possible incorporation of nanomaterials in each component of a cell [9].

Though the effectiveness of nanomaterials remains undisputed, only a minority of them is currently commercially utilized apparently as a result of the high cost to synthesize and manufacture them [7]. Sonochemistry may provide feasible tools to resolve many obstacles concerning the cost, safety, and environmental liability while fabricating the nanomaterials for batteries. As an example, we refer to Gu et al., who give a nice overview of graphene preparation by exfoliation in liquid media by using US as energy source and compared the results with those from other methods [10]. Graphene has excellent electrical, chemical, and mechanical properties and can, for example, boost the activity of electrodes especially of the oxygen electrodes in Zn-air batteries [11–13].

### **2.1 Li-batteries and Li-ion batteries**

High intensity USs have been used to prepare iron-graphene hybrid electrodes for Li-batteries, whereby it was found that the ultrasonication step is of key

**79**

devices [32].

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

importance for obtaining hybrid electrode material with small particle size and

s<sup>−</sup><sup>1</sup>

hindering its practical applications and must be tackled [15–17]. The preparation of nanomaterials for cathodes in Li-ion batteries (LIBs) has been proved to be one of the effective ways to overcome the problem of the slow Li diffusion and facilitate the reaction kinetics on the cathode. It is well known that porous structures can also increase the electrode/electrolyte interface area ensuring effective electrolyte permeation in cathode materials and substantially improve the performance of LiFePO4 and thus of the LIBs [17, 18]. It has been demonstrated that the adoption of ultrasonic-assisted impinging stream reaction is an effective method to produce positive electrode precursor particles for LIBs with high electrochemical

(NH4)Fe2(PO4)2(OH)·2H2O has been prepared as positive electrode material for LIBs. The ultrasonication step was followed by a hydrothermal treatment step [20]. Apart from LiFePO4, the preparation of Li-Mn-O electrode materials for second-

Mn3O4 is used as a precursor in the preparation of LiMn2O4 and can be synthesized using US in a direct step. Co3O4 used as key material in energy applications can be prepared by the same procedure [23]. Co3O4 nanoparticles (NPs) can be obtained by sonochemical synthesis also out of ionic liquids or azo ligands, using Co(CH3COO)2·2H2O as starting material [24, 25]. In both reports, the diameter of

A plethora of carbon morphologies has been extensively investigated as potential material appropriate for anode electrode in LIBs. Carbon spheres constitute an example applicable in LIBs [26, 27]. It has been demonstrated that the use of US provides an opportunity to prepare the mentioned material in a nontoxic accessible manner under mild conditions and competent dimensions (150–400 nm) [28]. Furthermore, recently Kumar et al. [29] outlined the progress in sonochemical synthesis of carbon dots, while Gedanken et al. [30] presented an advanced hybrid electrode of Cu foil coated by a layer of Sn@C-dots@Sn NPs ranging from 50 to 200 nm. These NPs were formed via sonication and contributed in promising

A novel approach for the preparation of electrodes is the use of composite materials based on graphene. Therefore, Fe(III) oxide was sonochemically coprecipitated on graphene nanosheets in order to obtain nanocomposites for rechargeable Li batteries with stable charge-discharge kinetics for ca. 120 cycles [31]. Wu et al. also prepared magnetite NPs on reduced graphene by using a one-pot US-assisted method. These nanocomposites allow for high performance lithium ion storage

Reduced graphene oxide (RGO) nanosheets dispersed under ultrasonic irradiation in NV (Ni3(VO4)2) NPs prove to eliminate their agglomeration; thus, the highly conductive electrode fabricated by the composite NV/RGO can preserve 88% of its

) after 1000 cycle tests [33].

ary Li-batteries has been examined. Kim et al. fabricated mesoporous LiMn2O4 nanospheres with upgraded properties and observed their performance in 50 cycles [21]. Sonochemical treatment of the surface of a corresponding Li-Mn-O electrode by coating particles with a porous film of MgO enhances its electrochemical proper-

the particle size of Co3O4 could be decreased lower than 50 nm.

Olivine-structured LiFePO4 is a very promising cathode material; has benefits such as nontoxicity, low cost of raw materials, and good structural stability at high temperature; is safe; and has relatively high-specific capacity (170 mA h g<sup>−</sup><sup>1</sup>

) with

) is

/Li) [15, 16]. However, the low dif-

to 10<sup>−</sup><sup>8</sup>

S cm<sup>−</sup><sup>1</sup>

) of the Li-ions lead to a poor rate perfor-

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

outstanding capacity and cyclability [14].

fusion coefficients (10<sup>−</sup>17 to 10−14 cm2

ties, especially in high temperatures [22].

cycling endurance of the cell.

initial capacity (117.22 mA h g<sup>−</sup><sup>1</sup>

performance [19].

a flat discharge-charge potential (3.45 V vs. Li<sup>+</sup>

mance of LiFePO4, and the poor electronic conductivity (10<sup>−</sup><sup>9</sup>

### *Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

importance for obtaining hybrid electrode material with small particle size and outstanding capacity and cyclability [14].

Olivine-structured LiFePO4 is a very promising cathode material; has benefits such as nontoxicity, low cost of raw materials, and good structural stability at high temperature; is safe; and has relatively high-specific capacity (170 mA h g<sup>−</sup><sup>1</sup> ) with a flat discharge-charge potential (3.45 V vs. Li<sup>+</sup> /Li) [15, 16]. However, the low diffusion coefficients (10<sup>−</sup>17 to 10−14 cm2 s<sup>−</sup><sup>1</sup> ) of the Li-ions lead to a poor rate performance of LiFePO4, and the poor electronic conductivity (10<sup>−</sup><sup>9</sup> to 10<sup>−</sup><sup>8</sup> S cm<sup>−</sup><sup>1</sup> ) is hindering its practical applications and must be tackled [15–17]. The preparation of nanomaterials for cathodes in Li-ion batteries (LIBs) has been proved to be one of the effective ways to overcome the problem of the slow Li diffusion and facilitate the reaction kinetics on the cathode. It is well known that porous structures can also increase the electrode/electrolyte interface area ensuring effective electrolyte permeation in cathode materials and substantially improve the performance of LiFePO4 and thus of the LIBs [17, 18]. It has been demonstrated that the adoption of ultrasonic-assisted impinging stream reaction is an effective method to produce positive electrode precursor particles for LIBs with high electrochemical performance [19].

(NH4)Fe2(PO4)2(OH)·2H2O has been prepared as positive electrode material for LIBs. The ultrasonication step was followed by a hydrothermal treatment step [20].

Apart from LiFePO4, the preparation of Li-Mn-O electrode materials for secondary Li-batteries has been examined. Kim et al. fabricated mesoporous LiMn2O4 nanospheres with upgraded properties and observed their performance in 50 cycles [21]. Sonochemical treatment of the surface of a corresponding Li-Mn-O electrode by coating particles with a porous film of MgO enhances its electrochemical properties, especially in high temperatures [22].

Mn3O4 is used as a precursor in the preparation of LiMn2O4 and can be synthesized using US in a direct step. Co3O4 used as key material in energy applications can be prepared by the same procedure [23]. Co3O4 nanoparticles (NPs) can be obtained by sonochemical synthesis also out of ionic liquids or azo ligands, using Co(CH3COO)2·2H2O as starting material [24, 25]. In both reports, the diameter of the particle size of Co3O4 could be decreased lower than 50 nm.

A plethora of carbon morphologies has been extensively investigated as potential material appropriate for anode electrode in LIBs. Carbon spheres constitute an example applicable in LIBs [26, 27]. It has been demonstrated that the use of US provides an opportunity to prepare the mentioned material in a nontoxic accessible manner under mild conditions and competent dimensions (150–400 nm) [28].

Furthermore, recently Kumar et al. [29] outlined the progress in sonochemical synthesis of carbon dots, while Gedanken et al. [30] presented an advanced hybrid electrode of Cu foil coated by a layer of Sn@C-dots@Sn NPs ranging from 50 to 200 nm. These NPs were formed via sonication and contributed in promising cycling endurance of the cell.

A novel approach for the preparation of electrodes is the use of composite materials based on graphene. Therefore, Fe(III) oxide was sonochemically coprecipitated on graphene nanosheets in order to obtain nanocomposites for rechargeable Li batteries with stable charge-discharge kinetics for ca. 120 cycles [31]. Wu et al. also prepared magnetite NPs on reduced graphene by using a one-pot US-assisted method. These nanocomposites allow for high performance lithium ion storage devices [32].

Reduced graphene oxide (RGO) nanosheets dispersed under ultrasonic irradiation in NV (Ni3(VO4)2) NPs prove to eliminate their agglomeration; thus, the highly conductive electrode fabricated by the composite NV/RGO can preserve 88% of its initial capacity (117.22 mA h g<sup>−</sup><sup>1</sup> ) after 1000 cycle tests [33].

*Nanotechnology and the Environment*

radicals can form in the hot regions.

of liquid [1, 2].

**2. Batteries**

tal standards [5, 6].

ones or deagglomerate nanoparticles. Other than the elevated temperature and pressure, those localized hotspots can result in powerful cavitation-generated shock waves and microjets, which can cause effective stirring/mixing of the adjusted layer

The first region is the interior of the bubble itself, which can be visualized as a micro-/nano-reactor, dictated by extreme temperature (>5000 K) and pressure conditions (>1000 atm) along with rapid heating/cooling rates (1010 K/s). The second one is the interface between the bubble and the bulk solvent. The reaction efficiency of nonvolatile solutes depends on their hydrophobicity, which determines their ability to accumulate at the gas-liquid interface [3]. The third region is the vicinity of the bubble, where the bulk solution is at ambient temperature, and free

As the globe encounters constant rise of energy demand to survive, the need to exploit efficiently renewable energy sources is vital. Electrochemical energy production can be a promising power source, while electrochemical devices constitute an energy storage option as well. Among these devices, batteries possess commensurate attention the last decades, due to their various applications and potential [4]. A battery cell, regardless its shape and configuration, is a device consisted of two electrodes, the anode and the cathode, an electrolyte between them having the role of the ionic conductor and a separator positioned between the electrodes that converts chemical energy to electricity or the reverse if the cell is rechargeable. Thus, the performance of the cell depends on the properties of all the components and the consistency of the system [5]. Τhe current challenges are to advance the energy density of batteries, extend their conversion efficiency and rechargeability, and eliminate the charging time and cost while meeting the safety and environmen-

In this direction, research has been emphasized toward developing nanostructured materials and implementing them in batteries as they deliver enriched performance, which is unapproachable by conventional materials. Some crucial aspects about nanomaterials are their large electrochemically active surface area, their electronic and ionic conductivity, thermal and mechanical endurance, and flexibility [7, 8]. In order to ameliorate redox reaction rates and accelerate kinetic mechanisms, a wide range of methods have been proposed including the possible

Though the effectiveness of nanomaterials remains undisputed, only a minority of them is currently commercially utilized apparently as a result of the high cost to synthesize and manufacture them [7]. Sonochemistry may provide feasible tools to resolve many obstacles concerning the cost, safety, and environmental liability while fabricating the nanomaterials for batteries. As an example, we refer to Gu et al., who give a nice overview of graphene preparation by exfoliation in liquid media by using US as energy source and compared the results with those from other methods [10]. Graphene has excellent electrical, chemical, and mechanical properties and can, for example, boost the activity of electrodes especially of the oxygen

High intensity USs have been used to prepare iron-graphene hybrid electrodes

for Li-batteries, whereby it was found that the ultrasonication step is of key

incorporation of nanomaterials in each component of a cell [9].

electrodes in Zn-air batteries [11–13].

**2.1 Li-batteries and Li-ion batteries**

**78**

Polyacrylonitrile (PAN) can be used as a component of solid composite electrolyte lithium battery [34]. A sonochemical method has been used to prepare negative electrode materials containing encapsulated intermetallic NPs in PAN. The use of US leads to very small particles of CoSn2, which favors the formation of amorphous Li-Co-Sn and CoSn2 alloys, while the carbonaceous matrix helps to maintain the small particle size. The resulting CoSn2-carbonaceous phase electrode (CoSn2@C) shows improved electrochemical behavior and is stable upon cycling (ca. 450 mA h g<sup>−</sup><sup>1</sup> after 50 cycles) in comparison with reports on pure crystalline CoSn2 [35].

Cu2O-based graphene composites have been prepared and tested for use as anode materials in lithium ion batteries [36] with superior performance than Cu2O and can be used also for photocatalytic applications, sensors, and energy storage, especially for supercapacitors [37].

Various reports investigate copper (II) oxide (CuO) and CuO/carbon composites as a possible anode material for LIBs [38–41]. Studies exploiting sonochemical methods for fabricating these materials involve the synthesis of copper complexes in an ultrasonic bath and the following calcination of compounds between 400 and 500°C. In this way, CuO particle size can be decreased until 12.1 nm. However, the specific structure and dimensions of particles differ depending on the precursor and the treatment conditions [42–44]. Hajnorouzi proposed a new method called "direct sonoelectrochemistry" incorporating ultrasonic irradiation in the process of electrolysis of a Cu tip and a physical top-down method, "US ablation" with Cu foil as the starting material to produce CuO NPs [45]. In comparison with conventional electrochemical methods, the produced amount of NPs was increased, and their dimensions were controlled, while the total time of preparation was reduced.

Nanoporous silicon structures are considered to be an attractive material in the design of LIBs as they have a large theoretical specific capacity [46–48]. Bedini et al. reported the synthesis of hydrogenated amorphous Si NPs under ultrasonic irradiation in mild conditions [49]. The product was highly porous with dimensions of particle ranging from 1.5 to 50 nm.

Two-dimensional molybdenum disulfide (MoS2) NPs have high potential implementation not only in LIBs but also in sodium-ion [50], Li-sulfur [50], zincion [50, 51], and Mg batteries [52]. Liquid-phase ultrasonic exfoliation method can be an attractive process to disperse nanosheets of MoS2 in various solvents [53]. One more layered 2D material that can be obtained with the contribution of US is V2O5 nanosheets according to Li et al., who fabricated and evaluated the electrochemical performance of the respective electrode [54].

Among the oxides of manganese, manganese dioxide (MnO2) finds application as energy storage material in alkaline batteries, rechargeable lithium batteries, and dry cells. Highly dispersed and nonagglomerated nano a-MnO2 with a needle form of 1–2 nm diameter and up to 50 nm length have been synthesized by ultrasonication of an aqueous manganese(ΙΙΙ)acetate solution with pH close to 7 followed by mild drying [55]. Reduction of KMnO4 has been also investigated as an alternative manner to exploit ultrasonic irradiation to prepare MnO2 [56, 57]. Okitsu et al. [56] provided useful data in order to comprehend the mechanism of basification, assisted by H2O2 molecules formed during sonication, while Gnana Sundara Raj et al. [57] used also polyethylene glycol so as to achieve reduction and prepare spherical MnO2 particles with dimensions from 10 up to 20 nm. This proved to exhibit proper electrochemical endurance (after 500 cycles, 87% of the initial capacitance was preserved, while in the end of 1000 cycles, 78% of the initial specific capacitance was preserved).

**81**

**3. Fuel cells**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

Not always is it possible to obtain the result one is looking for, during the preparation of nanomaterials using US. Ganesh Kumar et al. did not obtain lithiated manganese oxide suitable for lithium batteries by treating Mn(III) salts using US and hot-hydrolysis, but the study showed the superiority of the ultrasonication regarding the adjustment of particle properties [58]. In another attempt of the same group, LiNi0.5Mn1.5O4 was synthesized sonochemically as cathode with high redox

Zinc-air batteries (ZABs) exhibit a high energy density being at the same time a low-cost product. Therefore, a tremendous interest is present in meeting the demands for flexible and portable electronics. A novel porous-structured poly vinyl alcohol (PVA)-based nanocomposite gel polymer electrolyte (GPE) with silica (SiO2) was synthesized and used as electrolyte in a flexible ZAB. The fabricated porous material

and improved thermal and mechanical properties under ambient condition, and the ZAB showed an excellent cyclability, discharge performance, and power density [60]. It has been reported that cerium metallic particles deposited on Zn anode for alkali batteries lead to an improved electrochemical performance, whereby US power and sonication time influence strongly the battery efficiency, increase the corrosion resistance of the anode, and suppress the Zn-dendrite formation [61]. Regarding the oxygen reduction reaction (ORR), highly efficient cathodes for ZABs have been prepared based by decorating Fe2P on 3D N,P-codoped porous carbon. The later has been prepared using pore-forming agents [62]. Further, bimetallic oxides like perovskites can be immobilized on different substrates and used as air electrodes in ZABs. As an example, one can use nafion, which has antifouling properties and is very interesting in electrochemical application owing to its interesting electronic and catalytic properties. As an example, we refer to Chen

Nickel-iron layered double hydroxide (NiFe LDH) constitutes one more competitive catalyst with potential use in air cathodes, due to its layered structure. Sonication-assisted liquid exfoliation has been proposed to be competent to deliver highly functional NiFe LDH/CB nanosheets considering their oxygen evolution

Xie et al. prepared active cathodes for Ag2V4O11/Li battery systems through a reaction between V2O5 gel and Ag2O powder, which has been accelerated by using US [65]. The prepared cathodes (Ag2V4O11 and Ag1.4V3O8) exhibited superior electrochemical properties as compared to the ones prepared by this solid-state method. In Li-S batteries, the sulfur host plays an important role. With respect to this, hierarchically ordered micro/mesoporous carbon (HPC) has been prepared by US-assisted spray pyrolysis obtaining HPC-S cathodes, which exhibited an excellent

An electrochemical mechanism for the direct combustion (chemical oxidation) of fuels, which bypasses the intermediate stage of heat generation (so-called "cold

et al., who have immobilized SrWO3 on nafion by using US [63].

cycle retention of 77% in tests with 500 cycles at 2.4°C [66, 67].

), excellent water retention capability,

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

potential for LIBs with better cyclability [59].

exhibited a high ionic conductivity (57.3 mS cm<sup>−</sup><sup>1</sup>

(OER) catalytic properties and stability [64].

**2.3 Other battery systems**

**2.2 Zn-air and Zn alkali batteries**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

Not always is it possible to obtain the result one is looking for, during the preparation of nanomaterials using US. Ganesh Kumar et al. did not obtain lithiated manganese oxide suitable for lithium batteries by treating Mn(III) salts using US and hot-hydrolysis, but the study showed the superiority of the ultrasonication regarding the adjustment of particle properties [58]. In another attempt of the same group, LiNi0.5Mn1.5O4 was synthesized sonochemically as cathode with high redox potential for LIBs with better cyclability [59].

### **2.2 Zn-air and Zn alkali batteries**

*Nanotechnology and the Environment*

especially for supercapacitors [37].

preparation was reduced.

particle ranging from 1.5 to 50 nm.

performance of the respective electrode [54].

specific capacitance was preserved).

(ca. 450 mA h g<sup>−</sup><sup>1</sup>

CoSn2 [35].

Polyacrylonitrile (PAN) can be used as a component of solid composite electrolyte lithium battery [34]. A sonochemical method has been used to prepare negative electrode materials containing encapsulated intermetallic NPs in PAN. The use of US leads to very small particles of CoSn2, which favors the formation of amorphous Li-Co-Sn and CoSn2 alloys, while the carbonaceous matrix helps to maintain the small particle size. The resulting CoSn2-carbonaceous phase electrode (CoSn2@C) shows improved electrochemical behavior and is stable upon cycling

Cu2O-based graphene composites have been prepared and tested for use as anode materials in lithium ion batteries [36] with superior performance than Cu2O and can be used also for photocatalytic applications, sensors, and energy storage,

in an ultrasonic bath and the following calcination of compounds between 400 and 500°C. In this way, CuO particle size can be decreased until 12.1 nm. However, the specific structure and dimensions of particles differ depending on the precursor and the treatment conditions [42–44]. Hajnorouzi proposed a new method called "direct sonoelectrochemistry" incorporating ultrasonic irradiation in the process of electrolysis of a Cu tip and a physical top-down method, "US ablation" with Cu foil as the starting material to produce CuO NPs [45]. In comparison with conventional electrochemical methods, the produced amount of NPs was increased, and their dimensions were controlled, while the total time of

Various reports investigate copper (II) oxide (CuO) and CuO/carbon composites as a possible anode material for LIBs [38–41]. Studies exploiting sonochemical methods for fabricating these materials involve the synthesis of copper complexes

Nanoporous silicon structures are considered to be an attractive material in the design of LIBs as they have a large theoretical specific capacity [46–48]. Bedini et al. reported the synthesis of hydrogenated amorphous Si NPs under ultrasonic irradiation in mild conditions [49]. The product was highly porous with dimensions of

Two-dimensional molybdenum disulfide (MoS2) NPs have high potential implementation not only in LIBs but also in sodium-ion [50], Li-sulfur [50], zincion [50, 51], and Mg batteries [52]. Liquid-phase ultrasonic exfoliation method can be an attractive process to disperse nanosheets of MoS2 in various solvents [53]. One more layered 2D material that can be obtained with the contribution of US is V2O5 nanosheets according to Li et al., who fabricated and evaluated the electrochemical

Among the oxides of manganese, manganese dioxide (MnO2) finds application as energy storage material in alkaline batteries, rechargeable lithium batteries, and dry cells. Highly dispersed and nonagglomerated nano a-MnO2 with a needle form of 1–2 nm diameter and up to 50 nm length have been synthesized by ultrasonication of an aqueous manganese(ΙΙΙ)acetate solution with pH close to 7 followed by mild drying [55]. Reduction of KMnO4 has been also investigated as an alternative manner to exploit ultrasonic irradiation to prepare MnO2 [56, 57]. Okitsu et al. [56] provided useful data in order to comprehend the mechanism of basification, assisted by H2O2 molecules formed during sonication, while Gnana Sundara Raj et al. [57] used also polyethylene glycol so as to achieve reduction and prepare spherical MnO2 particles with dimensions from 10 up to 20 nm. This proved to exhibit proper electrochemical endurance (after 500 cycles, 87% of the initial capacitance was preserved, while in the end of 1000 cycles, 78% of the initial

after 50 cycles) in comparison with reports on pure crystalline

**80**

Zinc-air batteries (ZABs) exhibit a high energy density being at the same time a low-cost product. Therefore, a tremendous interest is present in meeting the demands for flexible and portable electronics. A novel porous-structured poly vinyl alcohol (PVA)-based nanocomposite gel polymer electrolyte (GPE) with silica (SiO2) was synthesized and used as electrolyte in a flexible ZAB. The fabricated porous material exhibited a high ionic conductivity (57.3 mS cm<sup>−</sup><sup>1</sup> ), excellent water retention capability, and improved thermal and mechanical properties under ambient condition, and the ZAB showed an excellent cyclability, discharge performance, and power density [60].

It has been reported that cerium metallic particles deposited on Zn anode for alkali batteries lead to an improved electrochemical performance, whereby US power and sonication time influence strongly the battery efficiency, increase the corrosion resistance of the anode, and suppress the Zn-dendrite formation [61].

Regarding the oxygen reduction reaction (ORR), highly efficient cathodes for ZABs have been prepared based by decorating Fe2P on 3D N,P-codoped porous carbon. The later has been prepared using pore-forming agents [62]. Further, bimetallic oxides like perovskites can be immobilized on different substrates and used as air electrodes in ZABs. As an example, one can use nafion, which has antifouling properties and is very interesting in electrochemical application owing to its interesting electronic and catalytic properties. As an example, we refer to Chen et al., who have immobilized SrWO3 on nafion by using US [63].

Nickel-iron layered double hydroxide (NiFe LDH) constitutes one more competitive catalyst with potential use in air cathodes, due to its layered structure. Sonication-assisted liquid exfoliation has been proposed to be competent to deliver highly functional NiFe LDH/CB nanosheets considering their oxygen evolution (OER) catalytic properties and stability [64].

### **2.3 Other battery systems**

Xie et al. prepared active cathodes for Ag2V4O11/Li battery systems through a reaction between V2O5 gel and Ag2O powder, which has been accelerated by using US [65]. The prepared cathodes (Ag2V4O11 and Ag1.4V3O8) exhibited superior electrochemical properties as compared to the ones prepared by this solid-state method.

In Li-S batteries, the sulfur host plays an important role. With respect to this, hierarchically ordered micro/mesoporous carbon (HPC) has been prepared by US-assisted spray pyrolysis obtaining HPC-S cathodes, which exhibited an excellent cycle retention of 77% in tests with 500 cycles at 2.4°C [66, 67].

### **3. Fuel cells**

An electrochemical mechanism for the direct combustion (chemical oxidation) of fuels, which bypasses the intermediate stage of heat generation (so-called "cold

combustion"), allows for the direct conversion of chemical energy of a fuel to electrical energy without the losses due to the Carnot process. This direct energy conversion is possible in devices called fuel cells, and the underlying electrochemical mechanism has analogies in living beings [68].

There are several types of fuel cells, mostly categorized based on the used electrolyte. A second classification is based on the temperature needed by the electrolyte to achieve sufficient ionic conductivity and one speaks about low-, intermediate-, and high-temperature fuel cells.

### **3.1 Low-temperature fuel cells**

The most important reaction in fuel cells is the provision with enough oxidant in order to keep the reaction running and thus the electricity production at the maximum level. This reaction is the reduction of the oxygen molecule (oxygen reduction reaction—ORR) as this is the source of the ions either to be transported through the solid electrolyte in solid oxide fuel cells (SOFCs) or to react with the protons arriving through the electrolyte in polymer electrolyte membrane (PEM) fuel cells.

In PEMs, the operating temperature is low, and therefore, the kinetics of the ORR is not high enough without the use of catalysts [69].

We prepared using the sonoelectrochemical method a Pt and carbon blackbased nanocomposite as electrocatalyst for PEM fuel cells. We used pulsed electrodeposition in combination with pulsed ultrasonication to obtain Pt NPs on carbon black substrates, and we have shown the beneficial role of polyvinylpyrrolidone (PVP) against the agglomeration of the produced NPs [70].

Despite the reports of many research groups that Pt-based materials are considered to be the best electrocatalyst for ORR in fuel cells, there is no doubt that their reserves in nature are very limited making them expensive. Further, their durability is not as high as needed to use them in commercial applications. Therefore, reduction of the Pt consumption and most importantly their replacement with nonprecious metal catalysts in the ORR are considered essential. Therefore, the development of non-Pt or metal-free ORR electrocatalysts is extremely important and urgent [71].

Pd-based catalysts are one of the most attractive choices for the replacement of Pt catalysts as their cost is significantly lower, and at the same time, they possess a high catalytic activity for ORR not only because of the Pd itself but also due to synergistic effects between the Pd and the other components and supports [72]. Until now, different Pd-based composite materials have been proposed and investigated as catalysts for ORR [73, 74].

A very useful overview on sonochemically prepared multicomponent electrocatalytic materials for low-temperature fuel cells is given by Lee and Kwon [75]. Most of the efforts are focusing on the partial replacement of Pt by low-cost metals, for example, Ni [76], or the Pt replacement by Pd and respective nanoalloys with low-cost metals (Mn and Fe as core-shell with Pd) as well [77]. Carbon-supported Sn NPs for electrochemical applications and especially for improving the kinetics of the ORR have been sonochemically synthesized and showed high reduction overpotential for the ORR mainly due to the high surface area of the resulting carbonsupported Sn electrode [78].

Further improvement in the catalytic activity of the developed catalysts is expected through core-shell architecture materials and also through the use of active supports with high porosity leading to high active centers on the catalyst surface. Unique Pd@Pt/C core-shell NPs as methanol-tolerant catalysts have been prepared by Zheng et al. in a sonochemical multistep approach [79]. The high

**83**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

performance of the Pd3Pt/C catalyst is ascribed to the unique combination of preferable growth of the Pd (1 1 1) plane, small particle size (∼4 nm), unique core/

compared to commercial catalysts with reduced methanol crossover [80].

Alternative electrocatalytic materials for the ORR have been also prepared starting from biomass and turned out to be promising alternatives to noble metal catalytic materials. The resulting catalysts exhibit an excellent catalytic activity as

Also, oxides of transition metals have been sonochemically prepared as electrocatalysts for the ORR. Highly active porous MnO2 with superior electrocatalytic activity as compared to commercial Pt/C catalyst has been sonochemically prepared and tested by Zuo et al. as a promising catalyst for direct methanol fuel cells [81]. US has been used also for the preparation of electrolyte membranes for PEMs. Nanocomposite membranes based on sulfonated polybenzimidazole (PBI) with cellulose and silica precursors have been made with improved mechanical properties

Zuo et al. prepared a composite cathode material for alkaline fuel cells based on MoS2 decorated with Pd using a simple sonochemical route [83]. They found that the new electrocatalyst has better performance than commercial Pt/C catalysts.

Fuel cells working at temperatures higher than 500°C are referred to as intermediate (<700°C) and high temperature (700–850°C) fuel cells. These are proton conducting ceramic fuel cells (PCFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). In all these fuel cells, the ORR is important, but in general, the use of catalysts is not necessary on the cathode side because of the high

In SOFCs, the ORR is as important as mentioned in the PEM section, but here the temperature is high enough to accelerate the ORR without the use of specific catalysts [84]. SOFC cathodes must be efficient mixed ionic-electronic conductors (MIECs) as they need to transport both electrons and ions especially in intermedi-

Once the cathode reaction is providing a sufficient amount of oxygen ions in SOFCs, the anode material is of outmost importance as it has to catalyze the oxida-

One of the critical components for such a device is hydrogen, which is the fuel to be oxidized. Hydrogen can be produced by not only the classical methods such as reforming of hydrocarbons, gasification of coal or heavy oil fractions, and electrolysis using renewable or nuclear energy sources but also sonochemically and sonoelectrochemically, as reported in a recent review [86]. Other groups have developed electrocatalysts for hydrogen evolution using US. High intensity ultrasonic irradiation of AlNi alloy has led to an electrocatalyst for water splitting with high surface area and changes in its composition, which can be controlled by the selection of the right fluid during sonication [87]. Nitrogen doped reduced graphene oxide supported on N-titania as efficient catalysts for the production of hydrogen through water splitting has been prepared in a combined sonochemical/

As oil and natural gas supply is well established, feeding SOFCs directly with natural gas would be an ideal solution [89]. For natural gas fed SOFCs, the catalytic activity of the anode materials is critical as it needs not only to accelerate the oxidation reaction but also to prevent poisoning of the active centers by coking and sulfur and to be stable against other components that may be contained in the natural gas.

shell structure, and the electronic effects between Pd and Pt.

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

and decreased methanol permeability [82].

**3.2 High-temperature fuel cells**

service temperatures.

tion reaction.

ate SOFCs (IT-SOFCs) [85].

hydrothermal step [88].

### *Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

performance of the Pd3Pt/C catalyst is ascribed to the unique combination of preferable growth of the Pd (1 1 1) plane, small particle size (∼4 nm), unique core/ shell structure, and the electronic effects between Pd and Pt.

Alternative electrocatalytic materials for the ORR have been also prepared starting from biomass and turned out to be promising alternatives to noble metal catalytic materials. The resulting catalysts exhibit an excellent catalytic activity as compared to commercial catalysts with reduced methanol crossover [80].

Also, oxides of transition metals have been sonochemically prepared as electrocatalysts for the ORR. Highly active porous MnO2 with superior electrocatalytic activity as compared to commercial Pt/C catalyst has been sonochemically prepared and tested by Zuo et al. as a promising catalyst for direct methanol fuel cells [81].

US has been used also for the preparation of electrolyte membranes for PEMs. Nanocomposite membranes based on sulfonated polybenzimidazole (PBI) with cellulose and silica precursors have been made with improved mechanical properties and decreased methanol permeability [82].

Zuo et al. prepared a composite cathode material for alkaline fuel cells based on MoS2 decorated with Pd using a simple sonochemical route [83]. They found that the new electrocatalyst has better performance than commercial Pt/C catalysts.

### **3.2 High-temperature fuel cells**

*Nanotechnology and the Environment*

**3.1 Low-temperature fuel cells**

cal mechanism has analogies in living beings [68].

intermediate-, and high-temperature fuel cells.

ORR is not high enough without the use of catalysts [69].

(PVP) against the agglomeration of the produced NPs [70].

combustion"), allows for the direct conversion of chemical energy of a fuel to electrical energy without the losses due to the Carnot process. This direct energy conversion is possible in devices called fuel cells, and the underlying electrochemi-

There are several types of fuel cells, mostly categorized based on the used electrolyte. A second classification is based on the temperature needed by the electrolyte to achieve sufficient ionic conductivity and one speaks about low-,

The most important reaction in fuel cells is the provision with enough oxidant in order to keep the reaction running and thus the electricity production at the maximum level. This reaction is the reduction of the oxygen molecule (oxygen reduction reaction—ORR) as this is the source of the ions either to be transported through the solid electrolyte in solid oxide fuel cells (SOFCs) or to react with the protons arriving through the electrolyte in polymer electrolyte membrane (PEM) fuel cells. In PEMs, the operating temperature is low, and therefore, the kinetics of the

We prepared using the sonoelectrochemical method a Pt and carbon blackbased nanocomposite as electrocatalyst for PEM fuel cells. We used pulsed electrodeposition in combination with pulsed ultrasonication to obtain Pt NPs on carbon black substrates, and we have shown the beneficial role of polyvinylpyrrolidone

Despite the reports of many research groups that Pt-based materials are considered to be the best electrocatalyst for ORR in fuel cells, there is no doubt that their reserves in nature are very limited making them expensive. Further, their durability is not as high as needed to use them in commercial applications. Therefore, reduction of the Pt consumption and most importantly their replacement with nonprecious metal catalysts in the ORR are considered essential. Therefore, the development of non-Pt or metal-free ORR electrocatalysts is extremely important

Pd-based catalysts are one of the most attractive choices for the replacement of Pt catalysts as their cost is significantly lower, and at the same time, they possess a high catalytic activity for ORR not only because of the Pd itself but also due to synergistic effects between the Pd and the other components and supports [72]. Until now, different Pd-based composite materials have been proposed and investigated

A very useful overview on sonochemically prepared multicomponent electrocatalytic materials for low-temperature fuel cells is given by Lee and Kwon [75]. Most of the efforts are focusing on the partial replacement of Pt by low-cost metals, for example, Ni [76], or the Pt replacement by Pd and respective nanoalloys with low-cost metals (Mn and Fe as core-shell with Pd) as well [77]. Carbon-supported Sn NPs for electrochemical applications and especially for improving the kinetics of the ORR have been sonochemically synthesized and showed high reduction overpotential for the ORR mainly due to the high surface area of the resulting carbon-

Further improvement in the catalytic activity of the developed catalysts is expected through core-shell architecture materials and also through the use of active supports with high porosity leading to high active centers on the catalyst surface. Unique Pd@Pt/C core-shell NPs as methanol-tolerant catalysts have been prepared by Zheng et al. in a sonochemical multistep approach [79]. The high

**82**

and urgent [71].

as catalysts for ORR [73, 74].

supported Sn electrode [78].

Fuel cells working at temperatures higher than 500°C are referred to as intermediate (<700°C) and high temperature (700–850°C) fuel cells. These are proton conducting ceramic fuel cells (PCFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). In all these fuel cells, the ORR is important, but in general, the use of catalysts is not necessary on the cathode side because of the high service temperatures.

In SOFCs, the ORR is as important as mentioned in the PEM section, but here the temperature is high enough to accelerate the ORR without the use of specific catalysts [84]. SOFC cathodes must be efficient mixed ionic-electronic conductors (MIECs) as they need to transport both electrons and ions especially in intermediate SOFCs (IT-SOFCs) [85].

Once the cathode reaction is providing a sufficient amount of oxygen ions in SOFCs, the anode material is of outmost importance as it has to catalyze the oxidation reaction.

One of the critical components for such a device is hydrogen, which is the fuel to be oxidized. Hydrogen can be produced by not only the classical methods such as reforming of hydrocarbons, gasification of coal or heavy oil fractions, and electrolysis using renewable or nuclear energy sources but also sonochemically and sonoelectrochemically, as reported in a recent review [86]. Other groups have developed electrocatalysts for hydrogen evolution using US. High intensity ultrasonic irradiation of AlNi alloy has led to an electrocatalyst for water splitting with high surface area and changes in its composition, which can be controlled by the selection of the right fluid during sonication [87]. Nitrogen doped reduced graphene oxide supported on N-titania as efficient catalysts for the production of hydrogen through water splitting has been prepared in a combined sonochemical/ hydrothermal step [88].

As oil and natural gas supply is well established, feeding SOFCs directly with natural gas would be an ideal solution [89]. For natural gas fed SOFCs, the catalytic activity of the anode materials is critical as it needs not only to accelerate the oxidation reaction but also to prevent poisoning of the active centers by coking and sulfur and to be stable against other components that may be contained in the natural gas.

In our group, several efforts have been made in order to improve the preparation methods of SOFCs [90–94] and SOFC materials [95, 96] with a focus on the anode compartment [97–99]. Emphasis was given on the implementation of US in order to reduce the preparation time or to follow a facile and/or alternative path for materials with improved properties. In most cases, we prepared nanomaterials because they offer special properties to the fuel cells as they are catalytically active to a wide range of chemical reactions. One can prepare novel SOFC anodes by decorating state-of-the-art anode powder with nanometric metals and metal oxides [100]. We decorated anode materials based on GDC/Nickel and YSZ/Nickel cermets with molybdenum and tungsten oxide NPs and improved the catalytic activity and stability of the resulting composite anodes against coking and sulfur poisoning [101].

Not only electrodes for SOFCs have been made using ultrasonication but also electrolytes. Okkay et al. prepared samaria doped ceria (SDC—Ce0.8Sm0.2O1.9) using an US-assisted coprecipitation method [102]. It has been found that the lattice parameter of the produced nanomaterial increased with increasing ultrasonic acoustic power and is linearly related to the ionic conductivity of the resulting electrolyte after sintering at 1200°C. Pinjari and Pandit prepared sonochemically at room temperature ceria nanopowders with particle size less than 30 nm with clear benefits regarding energy efficiency and reaction time as compared to the conventional preparation method [103]. Sonochemistry has been also used to prepare Ce(III) nano-sized precursors for nanoceria [104].

### **3.3 Other electrocatalytic applications**

USs can be used not only in batteries and fuel cells but also in many other electrochemical and sonoelectrochemical applications. Ultrasonication has been used for the preparation of electrocatalysts for the direct electrooxidation of ethanol. A facile US-assisted method was proposed to fabricate the Pd-Pt alloy/multiwalled carbon nanotube (Pd-Pt/CNTs) nanocomposites for the ethanol and methanol electrooxidation reaction in alkaline media [105].

In another attempt, a catalyst made of graphene supported Ag decorated Pd NPs with exceptional activity and uniformity. In this respect, it has been shown that graphene is very important as substrate as it minimizes the coalescence of the NPs, which would decrease both the surface area and the electrocatalytic activity [106]. A multifunctional nanostructured electrocatalyst has been prepared by replacing carbon copper nanowires by Pd resulting to Pd@CuNWs and supported them by multiwalled carbon nanotubes (MWCNTs) using chitosan (CH) as a binder. Electrochemical catalytic activity and durability evaluation results proved the superiority of the resulting Pd@CuNWs/MWCNTs/CH regarding electrocatalytic activity and long-term stability compared to Pd/MWCNTs and commercial Pd/C electrocatalysts for ethanol electrooxidation [107].

An overview on fundamental studies of sonochemical and sonoelectrochemical nanomaterial preparation is given in recent publications of our group on fuel cells [108, 109] and others on nanomaterials [110].

Silica gels have been considered as appropriate matrices for the preparation of complex center doped materials for a variety of applications such as controlledrelease carrier implantable materials for low weight drugs in biological systems and as substitute materials for membrane processes in fuel cells [111, 112].

Ultrasonication can be used for the atomization of methanol in order to have a smooth and continuous feed in direct methanol fuel cells, leading to a high and stable open circuit voltage (OCV) [113] or to enable improvement of direct methanol fuel cells using sonication in parallel with a novel cell design with integrated ultrasonic transducer [114].

**85**

surface [134].

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

Photocatalysis is a phenomenon based on redox reactions, which take place at the surface of a semiconductor material under UV or visible light irradiation. The photocatalytic activity of the catalyst depends on its ability to create electron-hole pairs, which are then taking part in a redox reaction to generate hydroxyl and superoxide radicals, which are able to undergo secondary reactions [115].

The improvement of the photocatalytic efficiency is a strategy, which was developed to push the absorption onset of TiO2 toward longer wavelengths (anatase band gap, 3.2 eV) by doping TiO2 with anions and/or cations and metal ions [116–118]. Zinc oxide can be either a n-type or a p-type semiconductor with a wide band gap (Eg ≈ 3.3 eV at 300 K), while its composites are very interesting materials because of possible synergistic effects on photoelectrochemical properties and photocatalytic activity [119, 120]. The primary ways to improve the photocatalytic effect can incorporate a sonocatalytic technique [121], doping [122], or stratified

The photocatalytic degradation of organic pollutants such as dyes, pesticides, and pharmaceutical waste is a crucial application for the safety of the ecological system, mainly due to their toxicity and degradation complexity. The main application areas in catalysis are photocatalytic electrolysis of water, environmental protection, and solar cells. The pollutants in wastewater can be roughly divided into organic and inorganic pollutants, where organic compounds can be degraded by TiO2

Converting CO2 waste into valuable carbon fuels is undoubtedly one of the most viable and economical alternatives to reduce the CO2 emissions and resolve the energy crisis. UV irradiation and visible light have been used as sources of excitement for semiconductor catalysts to produce energy-bearing products such as methane, methanol, carbon monoxide, formic acid, and formaldehyde. Photocatalytic reduction of CO2 can not only reduce the carbon dioxide emissions but also solve the energy crisis [126–128]. Some of the catalysts that can be used for the photocatalytic reduction of CO2 include WO3 [120], ZnIn2S4 [129], CdS [130],

Stucchi et al. used sonochemistry to both form NPs from the precursor and achieve a good distribution on the TiO2 decoration surface [117]. In fact, US energy accelerates the diffusion of the dissolved substance into the reaction system and also affects the selective adsorption of the surfactant on copper, causing elongation or compression in certain directions, thus affecting the morphology of the particles. The utilization of Cu, CuO, and Cu2O NPs on TiO2 surface can greatly enhance the

CdS/TiO2 can be prepared at a relatively low temperature (70°C) with small particle sizes (11 nm) using US in a short time (1.5 h) [130]. On the other hand, the use of conventional methods requires at least 20–24 h and elevated temperatures (200–400°C). The properties of complex core-shell materials are combinations of the properties of both materials in the core and the shell. Those materials can be used in photovoltaic cells, optical sensor photocatalysts, and catalysts. In addition, CdS/TiO2 NPs can selectively bind heavy metal ions, such as Cr (VI), on their

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

**4.1 Environmental and energy applications**

Cu2O [117], CuInS2 [131, 132], and BiVO4 [133].

**4.2 Sonochemical synthesis of nanocatalysts**

photodegradation of acetone and acetaldehyde [118].

photocatalytic technology [125].

**4. Photocatalysis**

films [123, 124].

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

### **4. Photocatalysis**

*Nanotechnology and the Environment*

Ce(III) nano-sized precursors for nanoceria [104].

electrooxidation reaction in alkaline media [105].

electrocatalysts for ethanol electrooxidation [107].

[108, 109] and others on nanomaterials [110].

ultrasonic transducer [114].

**3.3 Other electrocatalytic applications**

In our group, several efforts have been made in order to improve the preparation methods of SOFCs [90–94] and SOFC materials [95, 96] with a focus on the anode compartment [97–99]. Emphasis was given on the implementation of US in order to reduce the preparation time or to follow a facile and/or alternative path for materials with improved properties. In most cases, we prepared nanomaterials because they offer special properties to the fuel cells as they are catalytically active to a wide range of chemical reactions. One can prepare novel SOFC anodes by decorating state-of-the-art anode powder with nanometric metals and metal oxides [100]. We decorated anode materials based on GDC/Nickel and YSZ/Nickel cermets with molybdenum and tungsten oxide NPs and improved the catalytic activity and stability of the resulting composite anodes against coking and sulfur poisoning [101]. Not only electrodes for SOFCs have been made using ultrasonication but also electrolytes. Okkay et al. prepared samaria doped ceria (SDC—Ce0.8Sm0.2O1.9) using an US-assisted coprecipitation method [102]. It has been found that the lattice parameter of the produced nanomaterial increased with increasing ultrasonic acoustic power and is linearly related to the ionic conductivity of the resulting electrolyte after sintering at 1200°C. Pinjari and Pandit prepared sonochemically at room temperature ceria nanopowders with particle size less than 30 nm with clear benefits regarding energy efficiency and reaction time as compared to the conventional preparation method [103]. Sonochemistry has been also used to prepare

USs can be used not only in batteries and fuel cells but also in many other electrochemical and sonoelectrochemical applications. Ultrasonication has been used for the preparation of electrocatalysts for the direct electrooxidation of ethanol. A facile US-assisted method was proposed to fabricate the Pd-Pt alloy/multiwalled carbon nanotube (Pd-Pt/CNTs) nanocomposites for the ethanol and methanol

In another attempt, a catalyst made of graphene supported Ag decorated Pd NPs

An overview on fundamental studies of sonochemical and sonoelectrochemical nanomaterial preparation is given in recent publications of our group on fuel cells

Silica gels have been considered as appropriate matrices for the preparation of complex center doped materials for a variety of applications such as controlledrelease carrier implantable materials for low weight drugs in biological systems and

Ultrasonication can be used for the atomization of methanol in order to have a smooth and continuous feed in direct methanol fuel cells, leading to a high and stable open circuit voltage (OCV) [113] or to enable improvement of direct methanol fuel cells using sonication in parallel with a novel cell design with integrated

as substitute materials for membrane processes in fuel cells [111, 112].

with exceptional activity and uniformity. In this respect, it has been shown that graphene is very important as substrate as it minimizes the coalescence of the NPs, which would decrease both the surface area and the electrocatalytic activity [106]. A multifunctional nanostructured electrocatalyst has been prepared by replacing carbon copper nanowires by Pd resulting to Pd@CuNWs and supported them by multiwalled carbon nanotubes (MWCNTs) using chitosan (CH) as a binder. Electrochemical catalytic activity and durability evaluation results proved the superiority of the resulting Pd@CuNWs/MWCNTs/CH regarding electrocatalytic activity and long-term stability compared to Pd/MWCNTs and commercial Pd/C

**84**

Photocatalysis is a phenomenon based on redox reactions, which take place at the surface of a semiconductor material under UV or visible light irradiation. The photocatalytic activity of the catalyst depends on its ability to create electron-hole pairs, which are then taking part in a redox reaction to generate hydroxyl and superoxide radicals, which are able to undergo secondary reactions [115].

The improvement of the photocatalytic efficiency is a strategy, which was developed to push the absorption onset of TiO2 toward longer wavelengths (anatase band gap, 3.2 eV) by doping TiO2 with anions and/or cations and metal ions [116–118]. Zinc oxide can be either a n-type or a p-type semiconductor with a wide band gap (Eg ≈ 3.3 eV at 300 K), while its composites are very interesting materials because of possible synergistic effects on photoelectrochemical properties and photocatalytic activity [119, 120]. The primary ways to improve the photocatalytic effect can incorporate a sonocatalytic technique [121], doping [122], or stratified films [123, 124].

### **4.1 Environmental and energy applications**

The photocatalytic degradation of organic pollutants such as dyes, pesticides, and pharmaceutical waste is a crucial application for the safety of the ecological system, mainly due to their toxicity and degradation complexity. The main application areas in catalysis are photocatalytic electrolysis of water, environmental protection, and solar cells. The pollutants in wastewater can be roughly divided into organic and inorganic pollutants, where organic compounds can be degraded by TiO2 photocatalytic technology [125].

Converting CO2 waste into valuable carbon fuels is undoubtedly one of the most viable and economical alternatives to reduce the CO2 emissions and resolve the energy crisis. UV irradiation and visible light have been used as sources of excitement for semiconductor catalysts to produce energy-bearing products such as methane, methanol, carbon monoxide, formic acid, and formaldehyde. Photocatalytic reduction of CO2 can not only reduce the carbon dioxide emissions but also solve the energy crisis [126–128]. Some of the catalysts that can be used for the photocatalytic reduction of CO2 include WO3 [120], ZnIn2S4 [129], CdS [130], Cu2O [117], CuInS2 [131, 132], and BiVO4 [133].

### **4.2 Sonochemical synthesis of nanocatalysts**

Stucchi et al. used sonochemistry to both form NPs from the precursor and achieve a good distribution on the TiO2 decoration surface [117]. In fact, US energy accelerates the diffusion of the dissolved substance into the reaction system and also affects the selective adsorption of the surfactant on copper, causing elongation or compression in certain directions, thus affecting the morphology of the particles. The utilization of Cu, CuO, and Cu2O NPs on TiO2 surface can greatly enhance the photodegradation of acetone and acetaldehyde [118].

CdS/TiO2 can be prepared at a relatively low temperature (70°C) with small particle sizes (11 nm) using US in a short time (1.5 h) [130]. On the other hand, the use of conventional methods requires at least 20–24 h and elevated temperatures (200–400°C). The properties of complex core-shell materials are combinations of the properties of both materials in the core and the shell. Those materials can be used in photovoltaic cells, optical sensor photocatalysts, and catalysts. In addition, CdS/TiO2 NPs can selectively bind heavy metal ions, such as Cr (VI), on their surface [134].

The irradiation of W(CO)6 in diphenylmethane in the presence of an Ar-O2 mixture for 3 h can lead to tungsten oxide NPs consisting of both orthomolecular and monoclinic WO2, partial oxidation of which produces tricyclic WO3 [135]. WO3 acts as a catalyst in reducing CO2 in fuels (CH4 and CH3OH) with significant catalytic efficiency [136]. The introduction of CdS on WO3 can enhance carbon dioxide adsorption and increase CH4 selectivity, while the existence of two different regions can minimize undesirable back reactions of the photocatalytic products [137]. Those material CdS/WO3 can also use for the photocatalytic degradation of organic dye rhodamine B [138].

Xin et al. synthesized ZnIn2S4 nanosheets with hexagonal and cubic structures. The samples were prepared and used to form methyl formate by photochemically reducing CO2 to methanol. The efficiency of the hexagonal form was better than the cubic one. In addition, both hexagonal and cubic nanosheets exhibited much higher activity than ZnIn2S4 microspheres prepared by the hydrothermal method [129]. The ZnIn2S4-In2O3 structure is effectively used as a photocatalyst in CO2 reduction, by offering a large surface area for CO2 adsorption, while it exhibits abundant active sites for surface catalysis, leading to significant CO production rate and high stability [139].

Copper can also be used to prepare a CuInS2 NP structure. The study of various parameters, such as the different crystallographic structures of sulfur, the concentration of precursors, the reaction time, and the power of ultrasonic radiation on the morphology and particle size, showed that the crystallinity of sulfur plays an important role in the morphology of CuInS2 [131, 132]. Reducing CO2 to solar fuel can be essential for both decreasing CO2 emissions and increasing energy production. This photoelectrochemical reduction of CO2 to methanol is carried out by using p-CuInS2 as a photocathode [140].

BiVO4 NPs can be synthesized sonochemically at room temperature at different pH values (3, 5, and 10) of the original precursor without further heat treatment. The morphologies of the final samples are different depending on the pH value of the original precursor. The BiVO4 sample, which was prepared at a higher pH value, has an advantage in photocatalytic performance. The excellent photocatalytic efficiency can be attributed to the superior crystallinity and the large active surface of the BiVO4 structure [133], while its photocatalytic activity was studied during the degradation of organic dyes [134].

### **5. Metal-organic frameworks**

### **5.1 Properties and applications**

Metal-organic frameworks (MOFs) are a new class of porous crystalline hybrid materials that have achieved a tremendous growth over the last decades, with attention not only in chemistry but also in general science and technology. They consist of inorganic metal-based centers (ions or clusters) and organic ligands, assembled through strong coordination bonds in order to create an open crystalline framework with permanent porosity.

These ordered crystalline structures possess physicochemical properties, such as high surface area, open metal sites, and large void space. The easy tuning of the shape, size, and chemical nature of pores has led to unique chemical versatility and various morphologies, such as micro- or nano-spheres, -cubes, -sheets, and -rods [141–143]. Furthermore, accessing the molecular adsorption sites has opened the way to host-guest interactions and the ability to capture materials in both

**87**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

chemisorption and physisorption states [144]. Due to their controllable composition and targeted preparation, MOFs can be manipulated, so they can be used in

MOFs have been very promising in a wide spectrum of applications, ranging from the well-known gas storage/adsorption [145] and separation [146], catalysis [147], sensing [148], and dye/toxic material removal [149] to recently rising fields, such as luminescence [150], membranes [151], and drug delivery [152]. In terms of energy-related applications, they have been used for solar energy conversion [153],

MOFs have been traditionally synthesized either at room temperature [157] or via a hydrothermal/solvothermal approach by using electrical heating, an oil bath, or an autoclave at high temperatures, for a prolonged time of hours or even days. Recently, new methods have arisen to avoid these conditions. Similar to conventional, as a heating-based technique, microwaves (MWs) have lately been used widely for the synthesis of MOFs [158, 159], by offering phase selectivity, fast crystallization, and control over the crystal morphology. Electrochemical [160] and mechanochemical syntheses [161] are alternative methods, which appeared in 2005 and 2006, respectively. Other than the above popular methods, slow diffusion [162], reverse micelle [163], and combinations like sonoelectrochemical [164] have

This section is focused on the effect that US synthesis conditions have on the final product along with the use of sonochemically prepared MOFs in environmental applications with regard to harmful substance removal. (Zn3BTC2)·12H2O (BTC = 1,3,5-benzenetricarboxylate) was the first MOF that was successfully prepared by applying a sonochemical method in 2008 [165], followed by MOF-5 [166] and ZnBDC (BDC = 1,4-benzenedicarboxylate) [167] later that year.

In order to reveal the determining factors of the reaction rates, a kinetic study was performed in 2010, by comparing conventional, microwave, and US syntheses [168]. Fe-MIL-53 was chosen for the comparison due to its mild synthesis conditions. The average reaction time to obtain the product is 1.5–3 days at 70–80°C for the conventional synthesis, 1.5–2.5 h at 60–70°C for microwaves, and 0.5–1 h at 50–70°C for the US, which is a result of increased preexponential factors in the

Synthesis conditions can heavily affect the quality of crystals, the particle size, the surface area, and the morphology; thus, various studies have been published in an effort to optimize the reaction time, US power, solvent ratios, reagent concentration, and modulators/additives and achieve the best results in targeted applications

The contamination of the environment is becoming an aggravating problem [171, 172]. As a result of the accelerated expansion of chemical, pharmaceutical, and agricultural industries, many hazardous compounds, such as dyes, antibiotics, and pesticides, reach the aquatic environment. Therefore, many scientists have dedicated their work for the production of materials that can remove harmful substances.

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

supercapacitors [154], batteries [155], and fuel cells [156].

specific applications.

**5.2 Synthesis methods**

been tested as well.

**5.3 MOF synthesis via US**

sonochemical method.

**5.4 US advantages on MOFs**

[169, 170].

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

chemisorption and physisorption states [144]. Due to their controllable composition and targeted preparation, MOFs can be manipulated, so they can be used in specific applications.

MOFs have been very promising in a wide spectrum of applications, ranging from the well-known gas storage/adsorption [145] and separation [146], catalysis [147], sensing [148], and dye/toxic material removal [149] to recently rising fields, such as luminescence [150], membranes [151], and drug delivery [152]. In terms of energy-related applications, they have been used for solar energy conversion [153], supercapacitors [154], batteries [155], and fuel cells [156].

### **5.2 Synthesis methods**

*Nanotechnology and the Environment*

organic dye rhodamine B [138].

and high stability [139].

using p-CuInS2 as a photocathode [140].

the degradation of organic dyes [134].

**5. Metal-organic frameworks**

**5.1 Properties and applications**

with permanent porosity.

The irradiation of W(CO)6 in diphenylmethane in the presence of an Ar-O2 mixture for 3 h can lead to tungsten oxide NPs consisting of both orthomolecular and monoclinic WO2, partial oxidation of which produces tricyclic WO3 [135]. WO3 acts as a catalyst in reducing CO2 in fuels (CH4 and CH3OH) with significant catalytic efficiency [136]. The introduction of CdS on WO3 can enhance carbon dioxide adsorption and increase CH4 selectivity, while the existence of two different regions can minimize undesirable back reactions of the photocatalytic products [137]. Those material CdS/WO3 can also use for the photocatalytic degradation of

Xin et al. synthesized ZnIn2S4 nanosheets with hexagonal and cubic structures. The samples were prepared and used to form methyl formate by photochemically reducing CO2 to methanol. The efficiency of the hexagonal form was better than the cubic one. In addition, both hexagonal and cubic nanosheets exhibited much higher activity than ZnIn2S4 microspheres prepared by the hydrothermal method [129]. The ZnIn2S4-In2O3 structure is effectively used as a photocatalyst in CO2 reduction, by offering a large surface area for CO2 adsorption, while it exhibits abundant active sites for surface catalysis, leading to significant CO production rate

Copper can also be used to prepare a CuInS2 NP structure. The study of various parameters, such as the different crystallographic structures of sulfur, the concentration of precursors, the reaction time, and the power of ultrasonic radiation on the morphology and particle size, showed that the crystallinity of sulfur plays an important role in the morphology of CuInS2 [131, 132]. Reducing CO2 to solar fuel can be essential for both decreasing CO2 emissions and increasing energy production. This photoelectrochemical reduction of CO2 to methanol is carried out by

BiVO4 NPs can be synthesized sonochemically at room temperature at different pH values (3, 5, and 10) of the original precursor without further heat treatment. The morphologies of the final samples are different depending on the pH value of the original precursor. The BiVO4 sample, which was prepared at a higher pH value, has an advantage in photocatalytic performance. The excellent photocatalytic efficiency can be attributed to the superior crystallinity and the large active surface of the BiVO4 structure [133], while its photocatalytic activity was studied during

Metal-organic frameworks (MOFs) are a new class of porous crystalline hybrid materials that have achieved a tremendous growth over the last decades, with attention not only in chemistry but also in general science and technology. They consist of inorganic metal-based centers (ions or clusters) and organic ligands, assembled through strong coordination bonds in order to create an open crystalline framework

These ordered crystalline structures possess physicochemical properties, such as high surface area, open metal sites, and large void space. The easy tuning of the shape, size, and chemical nature of pores has led to unique chemical versatility and various morphologies, such as micro- or nano-spheres, -cubes, -sheets, and -rods [141–143]. Furthermore, accessing the molecular adsorption sites has opened the way to host-guest interactions and the ability to capture materials in both

**86**

MOFs have been traditionally synthesized either at room temperature [157] or via a hydrothermal/solvothermal approach by using electrical heating, an oil bath, or an autoclave at high temperatures, for a prolonged time of hours or even days. Recently, new methods have arisen to avoid these conditions. Similar to conventional, as a heating-based technique, microwaves (MWs) have lately been used widely for the synthesis of MOFs [158, 159], by offering phase selectivity, fast crystallization, and control over the crystal morphology. Electrochemical [160] and mechanochemical syntheses [161] are alternative methods, which appeared in 2005 and 2006, respectively. Other than the above popular methods, slow diffusion [162], reverse micelle [163], and combinations like sonoelectrochemical [164] have been tested as well.

### **5.3 MOF synthesis via US**

This section is focused on the effect that US synthesis conditions have on the final product along with the use of sonochemically prepared MOFs in environmental applications with regard to harmful substance removal. (Zn3BTC2)·12H2O (BTC = 1,3,5-benzenetricarboxylate) was the first MOF that was successfully prepared by applying a sonochemical method in 2008 [165], followed by MOF-5 [166] and ZnBDC (BDC = 1,4-benzenedicarboxylate) [167] later that year.

In order to reveal the determining factors of the reaction rates, a kinetic study was performed in 2010, by comparing conventional, microwave, and US syntheses [168]. Fe-MIL-53 was chosen for the comparison due to its mild synthesis conditions. The average reaction time to obtain the product is 1.5–3 days at 70–80°C for the conventional synthesis, 1.5–2.5 h at 60–70°C for microwaves, and 0.5–1 h at 50–70°C for the US, which is a result of increased preexponential factors in the sonochemical method.

Synthesis conditions can heavily affect the quality of crystals, the particle size, the surface area, and the morphology; thus, various studies have been published in an effort to optimize the reaction time, US power, solvent ratios, reagent concentration, and modulators/additives and achieve the best results in targeted applications [169, 170].

### **5.4 US advantages on MOFs**

The contamination of the environment is becoming an aggravating problem [171, 172]. As a result of the accelerated expansion of chemical, pharmaceutical, and agricultural industries, many hazardous compounds, such as dyes, antibiotics, and pesticides, reach the aquatic environment. Therefore, many scientists have dedicated their work for the production of materials that can remove harmful substances.

Abbasi et al. compared the sonochemical synthesis of HKUST-1 with a mechanochemical one [173]. The majority of the mechanochemically prepared particles had a size of at least 60 nm, while the US led to particles mainly around 35–65 nm. Their adsorption efficiency was tested via the removal of two dyes. After 24 h, 19.52% of methylene blue and 10.86% of crystal violet had been adsorbed by the mechanochemical MOFs, while the US one had managed to remove 31.91 and 27.43%, respectively. The increased adsorption of methylene blue could be explained due to its smaller size, so it can be captured more easily than crystal violet.

In order to improve the methylene blue adsorption performance of TMU-23, a composite was prepared with graphene oxide (GO) in a US bath within 60 min at room temperature [174]. About 30 mg of GO-TMU-23 (10% GO) was added in 20 mL of 10 ppm aqueous solution, as well as 27 mg TMU-23 and 3 mg GO were also examined separately for comparison purposes. After only 2 min, TMU-23, GO, and GO-TMU-23 have removed 50, 47, and 89% of MB, respectively, while after 15 min, they have removed 78, 90, and 97%, respectively. Another GO composite is GO-Ni-BTC, which was prepared via an US-assisted ball milling technique [175]. Water was used as the only solvent as the coupling effect of mechanical force and ultrasonic waves can promote the reaction without an organic solvent. The Ni-BTC and GO-Ni-BTC were compared by studying the thermodynamics, along with adsorption kinetics by using the congo red dye, resulting in capacities of 2046 and 2489 mg/g, respectively.

[Zn(ATA)(BPD)]∞ nanoplates (ATA = 2-aminoterephthalic acid, BPD = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) were prepared at room temperature in a US bath within the optimized duration of 120 min [176]. The addition of triethylamine accelerated the crystal growth, and crystals could get separated after 60 min, but 120 min was still needed to receive fully uniform nanoplates. The modulator implementation led to an increase in 2,4-dichlorophenol adsorption from 68 to 91%. Pyridine had also been tested as a modulator agent during the synthesis of [Zn(TDC)(4-BPMH)]n·n(H2O) (TDC = 2,5-thiophene dicarboxylic acid, 4-BPMH=N,N-bis-pyridin-4-yl-methylene-hydrazine) [177]. Its addition led to better morphology of uniform sheet-shaped nanoplates with a thickness of 20–35 nm instead of NPs without order, while it also increased the removal efficiency of dichlorophenol and amoxicillin from 92.5 to 95% and from 87 to 94.5%, respectively, after 3 h.

The adsorption of rifampicin (antibiotic drug) [178] and imatinib (anti-cancer drug) [179] was tested as well with HKUST-1. The MOF was prepared by both a sonochemical method within 60 min and a conventional one after 24 h at 80°C. The US synthesized particles had an average size of 80 nm, while the majority of the conventional ones had a size over 150 nm. Regarding the uptake properties, the former could adsorb 26.6% of rifampicin after 3 h and 98% after 48 h, while the latter could reach 19% and 59.6%, respectively. Similarly, although a greater time period was needed, after 144 h, 96.7% of imatinib was adsorbed by the US HKUST-1 and 81.1% by the conventional one.

### **6. Conclusions**

Among the several types of fuel cells, the use of nanoparticles has been implemented for improving the ORR in cathodes and the stability and poisoning of the anodic catalysts enhancing mainly the mass transfer phenomena. US-assisted preparation methods have been enabling more facile and cost-effective preparation methods of producing mono- and bimetallic nanoparticles in the absence and presence of various surfactants than conventional methods of preparations. The

**89**

limitations.

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

produced nanoparticles were decorated onto cathode surfaces used in low- and high-temperature fuel cells acting synergistically with the surface toward an enhanced catalytic activity. The use of US and/or sono(electro)chemical methods also produces a controllable variety in the shape of the exposed planar sites of the moieties onto electrode surfaces and was proven to be a powerful tool for reducing metal precursors to mono- or/and bimetallic nanoparticles. Especially, in the case of carbon-supported nanocatalysts, the use of US, in general, has been proposed toward a high-value product production to meet the needs of energy applications. US-assisted preparation methods are also a very promising tool in developing highly efficient materials for batteries. Significant efforts have been focused on creating functional nanomaterials in a variety of morphologies while decreasing the time and cost of preparation for meeting the commercial requirements. Substantial research has been reported in the field of Li and Li-ion batteries, where certain materials were directly tested in custom-made batteries with promising performance. Concerning other battery systems such as zinc-based and metal-air batteries, research showed promising results, although various nanomaterial candidates for electrodes, electrolytes, or catalysts have been prepared but not thoroughly tested. A more focused research trend in implementing the synthesized US-assisted nanomaterials in battery applications is currently toward a complete range definition of characteristics and stability in order to overcome possible failures and

In terms of environmental studies, semiconductor nanoparticles and composites prepared via US technology have shown promising results toward photocatalysis. Carbon dioxide reduction has achieved great process on both the reaction mechanisms and the pathways; thus, such materials can display better product selectivity. Finally, USs have opened the way to fast and facile synthesis of metal-organic frameworks by further offering smaller particle size and enhanced morphologies. Compared to conventional methods, the accelerated nucleation and crystallization times have made sonochemistry very attractive over the last few years, although proper handling is necessary in regard to synthesis conditions for the acquisition

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

and optimization of desired properties.

### *Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

produced nanoparticles were decorated onto cathode surfaces used in low- and high-temperature fuel cells acting synergistically with the surface toward an enhanced catalytic activity. The use of US and/or sono(electro)chemical methods also produces a controllable variety in the shape of the exposed planar sites of the moieties onto electrode surfaces and was proven to be a powerful tool for reducing metal precursors to mono- or/and bimetallic nanoparticles. Especially, in the case of carbon-supported nanocatalysts, the use of US, in general, has been proposed toward a high-value product production to meet the needs of energy applications.

US-assisted preparation methods are also a very promising tool in developing highly efficient materials for batteries. Significant efforts have been focused on creating functional nanomaterials in a variety of morphologies while decreasing the time and cost of preparation for meeting the commercial requirements. Substantial research has been reported in the field of Li and Li-ion batteries, where certain materials were directly tested in custom-made batteries with promising performance. Concerning other battery systems such as zinc-based and metal-air batteries, research showed promising results, although various nanomaterial candidates for electrodes, electrolytes, or catalysts have been prepared but not thoroughly tested. A more focused research trend in implementing the synthesized US-assisted nanomaterials in battery applications is currently toward a complete range definition of characteristics and stability in order to overcome possible failures and limitations.

In terms of environmental studies, semiconductor nanoparticles and composites prepared via US technology have shown promising results toward photocatalysis. Carbon dioxide reduction has achieved great process on both the reaction mechanisms and the pathways; thus, such materials can display better product selectivity.

Finally, USs have opened the way to fast and facile synthesis of metal-organic frameworks by further offering smaller particle size and enhanced morphologies. Compared to conventional methods, the accelerated nucleation and crystallization times have made sonochemistry very attractive over the last few years, although proper handling is necessary in regard to synthesis conditions for the acquisition and optimization of desired properties.

*Nanotechnology and the Environment*

2489 mg/g, respectively.

respectively, after 3 h.

81.1% by the conventional one.

**6. Conclusions**

Abbasi et al. compared the sonochemical synthesis of HKUST-1 with a mechanochemical one [173]. The majority of the mechanochemically prepared particles had a size of at least 60 nm, while the US led to particles mainly around 35–65 nm. Their adsorption efficiency was tested via the removal of two dyes. After 24 h, 19.52% of methylene blue and 10.86% of crystal violet had been adsorbed by the mechanochemical MOFs, while the US one had managed to remove 31.91 and 27.43%, respectively. The increased adsorption of methylene blue could be explained due to

In order to improve the methylene blue adsorption performance of TMU-23, a composite was prepared with graphene oxide (GO) in a US bath within 60 min at room temperature [174]. About 30 mg of GO-TMU-23 (10% GO) was added in 20 mL of 10 ppm aqueous solution, as well as 27 mg TMU-23 and 3 mg GO were also examined separately for comparison purposes. After only 2 min, TMU-23, GO, and GO-TMU-23 have removed 50, 47, and 89% of MB, respectively, while after 15 min, they have removed 78, 90, and 97%, respectively. Another GO composite is GO-Ni-BTC, which was prepared via an US-assisted ball milling technique [175]. Water was used as the only solvent as the coupling effect of mechanical force and ultrasonic waves can promote the reaction without an organic solvent. The Ni-BTC and GO-Ni-BTC were compared by studying the thermodynamics, along with adsorption kinetics by using the congo red dye, resulting in capacities of 2046 and

its smaller size, so it can be captured more easily than crystal violet.

[Zn(ATA)(BPD)]∞ nanoplates (ATA = 2-aminoterephthalic acid, BPD = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) were prepared at room temperature in a US bath within the optimized duration of 120 min [176]. The addition of triethylamine accelerated the crystal growth, and crystals could get separated after 60 min, but 120 min was still needed to receive fully uniform nanoplates. The modulator implementation led to an increase in 2,4-dichlorophenol adsorption from 68 to 91%. Pyridine had also been tested as a modulator agent during the synthesis of [Zn(TDC)(4-BPMH)]n·n(H2O) (TDC = 2,5-thiophene dicarboxylic acid, 4-BPMH=N,N-bis-pyridin-4-yl-methylene-hydrazine) [177]. Its addition led to better morphology of uniform sheet-shaped nanoplates with a thickness of 20–35 nm instead of NPs without order, while it also increased the removal efficiency of dichlorophenol and amoxicillin from 92.5 to 95% and from 87 to 94.5%,

The adsorption of rifampicin (antibiotic drug) [178] and imatinib (anti-cancer drug) [179] was tested as well with HKUST-1. The MOF was prepared by both a sonochemical method within 60 min and a conventional one after 24 h at 80°C. The US synthesized particles had an average size of 80 nm, while the majority of the conventional ones had a size over 150 nm. Regarding the uptake properties, the former could adsorb 26.6% of rifampicin after 3 h and 98% after 48 h, while the latter could reach 19% and 59.6%, respectively. Similarly, although a greater time period was needed, after 144 h, 96.7% of imatinib was adsorbed by the US HKUST-1 and

Among the several types of fuel cells, the use of nanoparticles has been implemented for improving the ORR in cathodes and the stability and poisoning of the anodic catalysts enhancing mainly the mass transfer phenomena. US-assisted preparation methods have been enabling more facile and cost-effective preparation methods of producing mono- and bimetallic nanoparticles in the absence and presence of various surfactants than conventional methods of preparations. The

**88**

*Nanotechnology and the Environment*

### **Author details**

Christos Vaitsis1 , Maria Mechili1 , Nikolaos Argirusis2 , Eirini Kanellou1,4, Pavlos K. Pandis1 , Georgia Sourkouni3 , Antonis Zorpas4 and Christos Argirusis1,3\*

1 School of Chemical Engineering, National Technical University of Athens, Zografou, Greece

2 mat4nrg – Gesellschaft für Materialien und Energieanwendungen mbH, Germany

3 TU Clausthal, Clausthaler Zentrum für Materialtechnologie, Germany

4 Faculty of Pure and Applied Sciences, Open University of Cyprus, Nicosia, Cyprus

\*Address all correspondence to: amca@chemeng.ntua.gr

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**91**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

2017;**353**:113-141. DOI: 10.1016/j.

Jia Z, Cui C, et al. Method of ultrasound-assisted liquid-phase exfoliation to prepare graphene. Ultrasonics Sonochemistry. 2019;**58**:104630. DOI: 10.1016/j.

[11] Bolotin KI, Sikes KJ, Jiang Z, Klima M, Fudenberg G, Hone J, et al. Ultrahigh electron mobility in suspended graphene. Solid State Communications. 2008;**146**(9-10): 351-355. DOI: 10.1016/j.ssc.2008.02.024

[12] Balandin A, Bao W, Calizo I,

[13] Lee C, Wei X, Kysar JW, Hone J. Measurement of the elastic properties and intrinsic strength of monolayer graphene. Science. 2008;**321**(5887): 385-388. DOI: 10.1126/science.1157996

[14] Gonzalez JR, Menendez R, Alcantara R, Nacimiento F, Tirado JL, Zhecheva E, et al. High-intensity ultrasonication as a way to prepare graphene/amorphous iron oxyhydroxide hybrid electrode with high capacity in lithium battery. Ultrasonics

Sonochemistry. 2015;**24**:238-246. DOI:

[15] Padhi AK, Nanjundaswamy KS, Masquelier C, Okada S, Goodenough JB. Effect of structure on the Fe3/Fe2 redox couple. Journal of the Electrochemical Society. 1997;**144**(5):1609-1613. DOI:

10.1016/j.ultsonch.2014.12.001

[16] Ding Y, Jiang Y, Xu F, Yin J, Ren H, Zhuo Q, et al. Preparation of nano-structured LiFePO4/graphene composites by co-precipitation method.

10.1149/1.1837649

DOI: 10.1021/nl0731872

Teweldebrhan D, Miao F, Lau J. Superior thermal conductivity of single-layer graphene. Nano Letters. 2008;**8**:902-907.

ultsonch.2019.104630

[10] Gu X, Zhao Y, Sun K, Vieira CLZ,

ccr.2017.10.005

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

[1] Mason TJ, Lorimer JP. Applied Sonochemistry: The Uses of Power Ultrasound in Chemistry and Processing. Weinheim: Wiley; 2002. p. 303. DOI: 10.1002/352760054X

[2] Suslick KS. Sonochemistry. Science. 1990;**247**(4949):1439-1445. DOI: 10.1126/science.247.4949.1439

[3] Henglein A. Sonochemistry: Historical developments and modern aspects. Ultrasonics. 1987;**25**(1):6-16. DOI: 10.1016/0041-624x(87)90003-5

[4] Winter M, Brodd R. What are

DOI: 10.1021/cr020730k

10.1002/adfm.201902499

[7] Pomerantseva E, Bonaccorso F, Feng X, Cui Y, Gogotsi Y. Energy storage: The future enabled by nanomaterials. Science.

2019;**366**(6468). DOI: 10.1126/science.

[8] Ibrahim ID, Sadiku ER, Jamiru T, Hamam Y, Alayli Y, Eze AA. Prospects of nanostructured composite materials for energy harvesting and storage. Journal of King Saud University - Science. 2020;**32**(1):758-764. DOI:

10.1016/j.jksus.2019.01.006

[9] Kumar P, Kim K-H, Bansal V, Kumar P. Nanostructured materials: A progressive assessment and future direction for energy device applications. Coordination Chemistry Reviews.

Education; 2001

aan8285

batteries, fuel cells, and supercapacitors? Chemical Reviews. 2004;**104**:4245-4269.

[5] Linden D, Reddy T. Handbook of Batteries. New York: McGraw-Hill

[6] Ryu J, Song WJ, Lee S, Choi S, Park S. A game changer: Functional nano/ micromaterials for smart rechargeable batteries. Advanced Functional Materials. 2019;**30**(2):1902499. DOI:

**References**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

### **References**

*Nanotechnology and the Environment*

**90**

Cyprus

**Author details**

Christos Vaitsis1

Pavlos K. Pandis1

Zografou, Greece

, Maria Mechili1

, Georgia Sourkouni3

\*Address all correspondence to: amca@chemeng.ntua.gr

provided the original work is properly cited.

, Nikolaos Argirusis2

2 mat4nrg – Gesellschaft für Materialien und Energieanwendungen mbH, Germany

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

1 School of Chemical Engineering, National Technical University of Athens,

3 TU Clausthal, Clausthaler Zentrum für Materialtechnologie, Germany

4 Faculty of Pure and Applied Sciences, Open University of Cyprus, Nicosia,

, Antonis Zorpas4

, Eirini Kanellou1,4,

and Christos Argirusis1,3\*

[1] Mason TJ, Lorimer JP. Applied Sonochemistry: The Uses of Power Ultrasound in Chemistry and Processing. Weinheim: Wiley; 2002. p. 303. DOI: 10.1002/352760054X

[2] Suslick KS. Sonochemistry. Science. 1990;**247**(4949):1439-1445. DOI: 10.1126/science.247.4949.1439

[3] Henglein A. Sonochemistry: Historical developments and modern aspects. Ultrasonics. 1987;**25**(1):6-16. DOI: 10.1016/0041-624x(87)90003-5

[4] Winter M, Brodd R. What are batteries, fuel cells, and supercapacitors? Chemical Reviews. 2004;**104**:4245-4269. DOI: 10.1021/cr020730k

[5] Linden D, Reddy T. Handbook of Batteries. New York: McGraw-Hill Education; 2001

[6] Ryu J, Song WJ, Lee S, Choi S, Park S. A game changer: Functional nano/ micromaterials for smart rechargeable batteries. Advanced Functional Materials. 2019;**30**(2):1902499. DOI: 10.1002/adfm.201902499

[7] Pomerantseva E, Bonaccorso F, Feng X, Cui Y, Gogotsi Y. Energy storage: The future enabled by nanomaterials. Science. 2019;**366**(6468). DOI: 10.1126/science. aan8285

[8] Ibrahim ID, Sadiku ER, Jamiru T, Hamam Y, Alayli Y, Eze AA. Prospects of nanostructured composite materials for energy harvesting and storage. Journal of King Saud University - Science. 2020;**32**(1):758-764. DOI: 10.1016/j.jksus.2019.01.006

[9] Kumar P, Kim K-H, Bansal V, Kumar P. Nanostructured materials: A progressive assessment and future direction for energy device applications. Coordination Chemistry Reviews.

2017;**353**:113-141. DOI: 10.1016/j. ccr.2017.10.005

[10] Gu X, Zhao Y, Sun K, Vieira CLZ, Jia Z, Cui C, et al. Method of ultrasound-assisted liquid-phase exfoliation to prepare graphene. Ultrasonics Sonochemistry. 2019;**58**:104630. DOI: 10.1016/j. ultsonch.2019.104630

[11] Bolotin KI, Sikes KJ, Jiang Z, Klima M, Fudenberg G, Hone J, et al. Ultrahigh electron mobility in suspended graphene. Solid State Communications. 2008;**146**(9-10): 351-355. DOI: 10.1016/j.ssc.2008.02.024

[12] Balandin A, Bao W, Calizo I, Teweldebrhan D, Miao F, Lau J. Superior thermal conductivity of single-layer graphene. Nano Letters. 2008;**8**:902-907. DOI: 10.1021/nl0731872

[13] Lee C, Wei X, Kysar JW, Hone J. Measurement of the elastic properties and intrinsic strength of monolayer graphene. Science. 2008;**321**(5887): 385-388. DOI: 10.1126/science.1157996

[14] Gonzalez JR, Menendez R, Alcantara R, Nacimiento F, Tirado JL, Zhecheva E, et al. High-intensity ultrasonication as a way to prepare graphene/amorphous iron oxyhydroxide hybrid electrode with high capacity in lithium battery. Ultrasonics Sonochemistry. 2015;**24**:238-246. DOI: 10.1016/j.ultsonch.2014.12.001

[15] Padhi AK, Nanjundaswamy KS, Masquelier C, Okada S, Goodenough JB. Effect of structure on the Fe3/Fe2 redox couple. Journal of the Electrochemical Society. 1997;**144**(5):1609-1613. DOI: 10.1149/1.1837649

[16] Ding Y, Jiang Y, Xu F, Yin J, Ren H, Zhuo Q, et al. Preparation of nano-structured LiFePO4/graphene composites by co-precipitation method. Electrochemistry Communications. 2010;**12**(1):10-13. DOI: 10.1016/j. elecom.2009.10.023

[17] Vu A, Qian Y, Stein A. Porous electrode materials for lithium-ion batteries - How to prepare them and what makes them special. Advanced Energy Materials. 2012;**2**(9):1056-1085. DOI: 10.1002/aenm.201200320

[18] Wang KX, Li XH, Chen JS. Surface and interface engineering of electrode materials for lithium-ion batteries. Advanced Materials. 2015;**27**(3): 527-545. DOI: 10.1002/adma.201402962

[19] Dong B, Huang X, Yang X, Li G, Xia L, Chen G. Rapid preparation of high electrochemical performance LiFePO4/C composite cathode material with an ultrasonic-intensified microimpinging jetting reactor. Ultrasonics Sonochemistry. 2017;**39**:816-826. DOI: 10.1016/j.ultsonch.2017.06.010

[20] Dong B, Li G, Yang X, Chen L, Chen GZ. Controllable synthesis of (NH4)Fe2(PO4)2(OH).2H2O using two-step route: Ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment. Ultrasonics Sonochemistry. 2018;**42**:452-463. DOI: 10.1016/j. ultsonch.2017.12.008

[21] Kim JM, Lee G, Kim BH, Huh YS, Lee GW, Kim HJ. Ultrasound-assisted synthesis of Li-rich mesoporous LiMn2O4 nanospheres for enhancing the electrochemical performance in Li-ion secondary batteries. Ultrasonics Sonochemistry. 2012;**19**(3):627-631. DOI: 10.1016/j.ultsonch.2011.10.002

[22] Gnanaraj JS, Pol VG, Gedanken A, Aurbach D. Improving the hightemperature performance of LiMn2O4 spinel electrodes by coating the active mass with MgO via a sonochemical method. Electrochemistry Communications. 2003;**5**(11):940-945. DOI: 10.1016/j.elecom.2003.08.012

[23] Askarinejad A, Morsali A. Direct ultrasonic-assisted synthesis of spherelike nanocrystals of spinel Co3O4 and Mn3O4. Ultrasonics Sonochemistry. 2009;**16**(1):124-131. DOI: 10.1016/j. ultsonch.2008.05.015

[24] Al-Qirby LM, Radiman S, Siong CW, Ali AM. Sonochemical synthesis and characterization of Co3O4 nanocrystals in the presence of the ionic liquid [EMIM][BF4]. Ultrasonics Sonochemistry. 2017;**38**:640-651. DOI: 10.1016/j.ultsonch.2016.08.016

[25] Cheng XX, Hojaghani S, Hu ML, Hosaini Sadr M, Morsali A. Sonochemical synthesis and characterization of new nanostructures cobalt(II) metal-organic complexes derived from the azo-coupling reaction of 4-amino benzoic acid with anthranilic acid, salicylaldehyde and 2-naphtol. Ultrasonics Sonochemistry. 2017;**37**:614-622. DOI: 10.1016/j. ultsonch.2017.02.007

[26] Pol V, Thackeray M. Spherical carbon particles and carbon nanotubes prepared by autogenic reactions: Evaluation as anodes in lithium electrochemical cells. Energy & Environmental Science. 2011;**4**:1904- 1912. DOI: 10.1039/c0ee00256a

[27] Roberts AD, Li X, Zhang H. Porous carbon spheres and monoliths: Morphology control, pore size tuning and their applications as Li-ion battery anode materials. Chemical Society Reviews. 2014;**43**(13):4341-4356. DOI: 10.1039/c4cs00071d

[28] Fujita M, Komatsu N, Kimura T. Sonochemical preparation of carbon spheres. Ultrasonics Sonochemistry. 2014;**21**(3):943-945. DOI: 10.1016/j. ultsonch.2013.11.013

[29] Kumar R, Kumar VB, Gedanken A. Sonochemical synthesis of carbon dots, mechanism, effect of parameters, and catalytic, energy, biomedical and tissue

**93**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

oxide composite. Journal of Solid State Chemistry. 2009;**182**:2486-2490. DOI:

[37] Abulizi A, Yang GH, Zhu JJ. Onestep simple sonochemical fabrication and photocatalytic properties of Cu2O-rGO composites. Ultrasonics Sonochemistry. 2014;**21**(1):129-135. DOI: 10.1016/j.ultsonch.2013.07.013

[38] Wang C, Higgins D, Wang F, Li D, Liu R, Xia G, et al. Controlled synthesis of micro/nanostructured CuO anodes for lithium-ion batteries. Nano Energy. 2014;**9**:334-344. DOI: 10.1016/j.

[39] Park JC, Kim J, Kwon H, Song H. Gram-scale synthesis of Cu2O

nanocubes and subsequent oxidation to CuO hollow nanostructures for lithiumion battery anode materials. Advanced Materials. 2009;**21**(7):803-807. DOI:

nanoen.2014.08.009

10.1002/adma.200800596

adma.201201821

[40] Ko S, Lee JI, Yang HS, Park S, Jeong U. Mesoporous CuO particles threaded with CNTs for highperformance lithium-ion battery anodes. Advanced Materials.

2012;**24**(32):4451-4456. DOI: 10.1002/

[41] Mai YJ, Wang XL, Xiang JY, Qiao YQ, Zhang D, Gu CD, et al. CuO/ graphene composite as anode materials for lithium-ion batteries. Electrochimica Acta. 2011;**56**(5):2306-2311. DOI: 10.1016/j.electacta.2010.11.036

[42] Hojaghani S, Hosaini Sadr M, Morsali A. Sonochemical synthesis of two new copper(II) complexes with azo ligands derived from anthranilic acid and beta-naphtol. Ultrasonics Sonochemistry. 2015;**26**:305-311. DOI:

10.1016/j.ultsonch.2015.02.009

[43] Parsaee Z, Joukar Bahaderani E, Afandak A. Sonochemical synthesis, in vitro evaluation and DFT study of novel phenothiazine base Schiff bases

10.1016/j.jssc.2009.07.001

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

engineering applications. Ultrasonics Sonochemistry. 2020;**64**:105009. DOI: 10.1016/j.ultsonch.2020.105009

[30] Kumar VB, Tang J, Lee KJ, Pol VG, Gedanken A. In situ sonochemical synthesis of luminescent Sn@C-dots and hybrid Sn@C-dots@Sn anode for lithium-ion batteries. RSC Advances. 2016;**6**(70):66256-66265. DOI: 10.1039/

[31] Deosarkar MP, Pawar SM, Bhanvase BA. In situ sonochemical synthesis of Fe3O4-graphene

batteries. Chemical Engineering and Processing. 2014;**83**:49-55. DOI:

[32] Wu K, Liu D, Lu W, Zhang K. One-pot sonochemical synthesis of magnetite@reduced graphene oxide nanocomposite for high performance Li ion storage. Ultrasonics Sonochemistry.

2018;**45**:167-172. DOI: 10.1016/j.

[33] Hamidi R, Ghasemi S, Hosseini SR. Ultrasonic assisted synthesis of Ni3(VO4)2 reduced graphene oxide nanocomposite for potential use in electrochemical energy storage. Ultrasonics Sonochemistry. 2020;**62**:104869. DOI: 10.1016/j.

[34] Chen Y, Chuang Y, Su JH, Yu HC, Chen-Yang YW. High discharge capacity solid composite polymer electrolyte lithium battery. Lancet. 2011;**196**:2802-2809. DOI: 10.1016/j.

ultsonch.2018.03.015

ultsonch.2019.104869

jpowsour.2010.11.058

[35] Nacimiento F, Alcantara R, Nwokeke UG, Gonzalez JR, Tirado JL.

Nanocrystalline CoSn2-carbon composite electrode prepared by using sonochemistry. Ultrasonics Sonochemistry. 2012;**19**(2):352-357. DOI: 10.1016/j.ultsonch.2011.06.014

[36] Xu C, Wang X, Yang L, Wu Y. Fabrication of a graphene-cuprous

10.1016/j.cep.2014.07.004

nanocomposite for lithium rechargeable

C6RA09926B

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

engineering applications. Ultrasonics Sonochemistry. 2020;**64**:105009. DOI: 10.1016/j.ultsonch.2020.105009

*Nanotechnology and the Environment*

elecom.2009.10.023

Electrochemistry Communications. 2010;**12**(1):10-13. DOI: 10.1016/j.

[23] Askarinejad A, Morsali A. Direct ultrasonic-assisted synthesis of spherelike nanocrystals of spinel Co3O4 and Mn3O4. Ultrasonics Sonochemistry. 2009;**16**(1):124-131. DOI: 10.1016/j.

ultsonch.2008.05.015

[24] Al-Qirby LM, Radiman S, Siong CW, Ali AM. Sonochemical synthesis and characterization of Co3O4 nanocrystals in the presence of the ionic liquid [EMIM][BF4]. Ultrasonics Sonochemistry. 2017;**38**:640-651. DOI:

10.1016/j.ultsonch.2016.08.016

[25] Cheng XX, Hojaghani S, Hu ML, Hosaini Sadr M, Morsali A.

Sonochemical synthesis and

ultsonch.2017.02.007

10.1039/c4cs00071d

ultsonch.2013.11.013

characterization of new nanostructures cobalt(II) metal-organic complexes derived from the azo-coupling

reaction of 4-amino benzoic acid with anthranilic acid, salicylaldehyde and 2-naphtol. Ultrasonics Sonochemistry. 2017;**37**:614-622. DOI: 10.1016/j.

[26] Pol V, Thackeray M. Spherical carbon particles and carbon nanotubes prepared by autogenic reactions: Evaluation as anodes in lithium electrochemical cells. Energy & Environmental Science. 2011;**4**:1904- 1912. DOI: 10.1039/c0ee00256a

[27] Roberts AD, Li X, Zhang H. Porous carbon spheres and monoliths: Morphology control, pore size tuning and their applications as Li-ion battery anode materials. Chemical Society Reviews. 2014;**43**(13):4341-4356. DOI:

[28] Fujita M, Komatsu N, Kimura T. Sonochemical preparation of carbon spheres. Ultrasonics Sonochemistry. 2014;**21**(3):943-945. DOI: 10.1016/j.

[29] Kumar R, Kumar VB, Gedanken A. Sonochemical synthesis of carbon dots, mechanism, effect of parameters, and catalytic, energy, biomedical and tissue

[17] Vu A, Qian Y, Stein A. Porous electrode materials for lithium-ion batteries - How to prepare them and what makes them special. Advanced Energy Materials. 2012;**2**(9):1056-1085.

DOI: 10.1002/aenm.201200320

[18] Wang KX, Li XH, Chen JS. Surface and interface engineering of electrode materials for lithium-ion batteries. Advanced Materials. 2015;**27**(3): 527-545. DOI: 10.1002/adma.201402962

[19] Dong B, Huang X, Yang X, Li G, Xia L, Chen G. Rapid preparation of high electrochemical performance LiFePO4/C composite cathode material with an ultrasonic-intensified microimpinging jetting reactor. Ultrasonics Sonochemistry. 2017;**39**:816-826. DOI:

10.1016/j.ultsonch.2017.06.010

Ultrasonics Sonochemistry. 2018;**42**:452-463. DOI: 10.1016/j.

ultsonch.2017.12.008

[20] Dong B, Li G, Yang X, Chen L, Chen GZ. Controllable synthesis of (NH4)Fe2(PO4)2(OH).2H2O using two-step route: Ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment.

[21] Kim JM, Lee G, Kim BH, Huh YS, Lee GW, Kim HJ. Ultrasound-assisted synthesis of Li-rich mesoporous LiMn2O4 nanospheres for enhancing the electrochemical performance in Li-ion secondary batteries. Ultrasonics Sonochemistry. 2012;**19**(3):627-631. DOI: 10.1016/j.ultsonch.2011.10.002

[22] Gnanaraj JS, Pol VG, Gedanken A, Aurbach D. Improving the hightemperature performance of LiMn2O4 spinel electrodes by coating the active mass with MgO via a sonochemical

Communications. 2003;**5**(11):940-945. DOI: 10.1016/j.elecom.2003.08.012

method. Electrochemistry

**92**

[30] Kumar VB, Tang J, Lee KJ, Pol VG, Gedanken A. In situ sonochemical synthesis of luminescent Sn@C-dots and hybrid Sn@C-dots@Sn anode for lithium-ion batteries. RSC Advances. 2016;**6**(70):66256-66265. DOI: 10.1039/ C6RA09926B

[31] Deosarkar MP, Pawar SM, Bhanvase BA. In situ sonochemical synthesis of Fe3O4-graphene nanocomposite for lithium rechargeable batteries. Chemical Engineering and Processing. 2014;**83**:49-55. DOI: 10.1016/j.cep.2014.07.004

[32] Wu K, Liu D, Lu W, Zhang K. One-pot sonochemical synthesis of magnetite@reduced graphene oxide nanocomposite for high performance Li ion storage. Ultrasonics Sonochemistry. 2018;**45**:167-172. DOI: 10.1016/j. ultsonch.2018.03.015

[33] Hamidi R, Ghasemi S, Hosseini SR. Ultrasonic assisted synthesis of Ni3(VO4)2 reduced graphene oxide nanocomposite for potential use in electrochemical energy storage. Ultrasonics Sonochemistry. 2020;**62**:104869. DOI: 10.1016/j. ultsonch.2019.104869

[34] Chen Y, Chuang Y, Su JH, Yu HC, Chen-Yang YW. High discharge capacity solid composite polymer electrolyte lithium battery. Lancet. 2011;**196**:2802-2809. DOI: 10.1016/j. jpowsour.2010.11.058

[35] Nacimiento F, Alcantara R, Nwokeke UG, Gonzalez JR, Tirado JL. Nanocrystalline CoSn2-carbon composite electrode prepared by using sonochemistry. Ultrasonics Sonochemistry. 2012;**19**(2):352-357. DOI: 10.1016/j.ultsonch.2011.06.014

[36] Xu C, Wang X, Yang L, Wu Y. Fabrication of a graphene-cuprous oxide composite. Journal of Solid State Chemistry. 2009;**182**:2486-2490. DOI: 10.1016/j.jssc.2009.07.001

[37] Abulizi A, Yang GH, Zhu JJ. Onestep simple sonochemical fabrication and photocatalytic properties of Cu2O-rGO composites. Ultrasonics Sonochemistry. 2014;**21**(1):129-135. DOI: 10.1016/j.ultsonch.2013.07.013

[38] Wang C, Higgins D, Wang F, Li D, Liu R, Xia G, et al. Controlled synthesis of micro/nanostructured CuO anodes for lithium-ion batteries. Nano Energy. 2014;**9**:334-344. DOI: 10.1016/j. nanoen.2014.08.009

[39] Park JC, Kim J, Kwon H, Song H. Gram-scale synthesis of Cu2O nanocubes and subsequent oxidation to CuO hollow nanostructures for lithiumion battery anode materials. Advanced Materials. 2009;**21**(7):803-807. DOI: 10.1002/adma.200800596

[40] Ko S, Lee JI, Yang HS, Park S, Jeong U. Mesoporous CuO particles threaded with CNTs for highperformance lithium-ion battery anodes. Advanced Materials. 2012;**24**(32):4451-4456. DOI: 10.1002/ adma.201201821

[41] Mai YJ, Wang XL, Xiang JY, Qiao YQ, Zhang D, Gu CD, et al. CuO/ graphene composite as anode materials for lithium-ion batteries. Electrochimica Acta. 2011;**56**(5):2306-2311. DOI: 10.1016/j.electacta.2010.11.036

[42] Hojaghani S, Hosaini Sadr M, Morsali A. Sonochemical synthesis of two new copper(II) complexes with azo ligands derived from anthranilic acid and beta-naphtol. Ultrasonics Sonochemistry. 2015;**26**:305-311. DOI: 10.1016/j.ultsonch.2015.02.009

[43] Parsaee Z, Joukar Bahaderani E, Afandak A. Sonochemical synthesis, in vitro evaluation and DFT study of novel phenothiazine base Schiff bases and their nano copper complexes as the precursors for new shaped CuO-NPs. Ultrasonics Sonochemistry. 2018;**40**(Pt A):629-643. DOI: 10.1016/j. ultsonch.2017.08.010

[44] Alavi MA, Morsali A, Joo SW, Min BK. Ultrasound and modulation assisted synthesis of {[Cu2(BDC-NH2)2(dabco)]DMF.3H2O} nanostructures: New precursor to prepare nanorods and nanotubes of copper(II) oxide. Ultrasonics Sonochemistry. 2015;**22**:349-358. DOI: 10.1016/j.ultsonch.2014.04.017

[45] Hajnorouzi A. Two ultrasonic applications for the synthesis of nanostructured copper oxide (II). Ultrasonics Sonochemistry. 2020;**64**:105020. DOI: 10.1016/j. ultsonch.2020.105020

[46] Yang Z, Du Y, Hou G, Ouyang Y, Ding F, Yuan F. Nanoporous silicon spheres preparation via a controllable magnesiothermic reduction as anode for Li-ion batteries. Electrochimica Acta. 2020;**329**:135141. DOI: 10.1016/j. electacta.2019.135141

[47] Ge M, Rong J, Fang X, Zhang A, Lu Y, Zhou C. Scalable preparation of porous silicon nanoparticles and their application for lithium-ion battery anodes. Nano Research. 2013;**6**(3): 174-181. DOI: 10.1007/s12274-013-0293-y

[48] Zhao Y, Liu X, Li H, Zhai T, Zhou H. Hierarchical micro/nanoporous silicon Li-ion battery anodes. Chemical Communications. 2012;**48**(42): 5079-5081. DOI: 10.1039/c2cc31476b

[49] Cadiz Bedini AP, Klingebiel B, Luysberg M, Carius R. Sonochemical synthesis of hydrogenated amorphous silicon nanoparticles from liquid trisilane at ambient temperature and pressure. Ultrasonics Sonochemistry. 2017;**39**:883-888. DOI: 10.1016/j. ultsonch.2017.06.011

[50] Li XL, Li TC, Huang S, Zhang J, Pam ME, Yang HY. Controllable synthesis of two-dimensional molybdenum disulfide (MoS2) for energy-storage applications. ChemSusChem. 2020;**13**(6):1379-1391. DOI: 10.1002/cssc.201902706

[51] Xu W, Sun C, Zhao K, Cheng X, Rawal S, Xu Y, et al. Defect engineering activating (boosting) zinc storage capacity of MoS2. Energy Storage Materials. 2019;**16**:527-534. DOI: 10.1016/j.ensm.2018.09.009

[52] Liang Y, Feng R, Yang S, Ma H, Liang J, Chen J. Rechargeable Mg batteries with graphene-like MoS(2) cathode and ultrasmall Mg nanoparticle anode. Advanced Materials. 2011;**23**(5):640-643. DOI: 10.1002/ adma.201003560

[53] Liu Y, Li R. Study on ultrasoundassisted liquid-phase exfoliation for preparing graphene-like molybdenum disulfide nanosheets. Ultrasonics Sonochemistry. 2020;**63**:104923. DOI: 10.1016/j.ultsonch.2019.104923

[54] Li Y, Yao J, Uchaker E, Yang J, Huang Y, Zhang M, et al. Leaf-like V2O5 nanosheets fabricated by a facile green approach as high energy cathode material for lithium-ion batteries. Advanced Energy Materials. 2013;**3**(9):1171-1175. DOI: 10.1002/aenm.201300188

[55] Kumar VG, Kim KB. Organized and highly dispersed growth of MnO2 nanorods by sonochemical hydrolysis of Mn3 acetate. Ultrasonics Sonochemistry. 2006;**13**(6):549-556. DOI: 10.1016/j. ultsonch.2005.09.010

[56] Okitsu K, Iwatani M, Nanzai B, Nishimura R, Maeda Y. Sonochemical reduction of permanganate to manganese dioxide: The effects of H2O2 formed in the sonolysis of water on the rates of reduction. Ultrasonics Sonochemistry. 2009;**16**(3):387-391. DOI: 10.1016/j.ultsonch.2008.10.009

**95**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

electrochemical sensing performance.

Nomngongo PN. Ultrasonic exfoliation

[65] Xie J, Cao X, Li J, Zhan H, Xia Y, Zhou Y. Application of ultrasonic irradiation to the sol-gel synthesis of silver vanadium oxides. Ultrasonics Sonochemistry. 2005;**12**(4):289-293. DOI: 10.1016/j.ultsonch.2004.01.041

[66] Park J, Yu S-H, Sung Y-E. Design of structural and functional nanomaterials for lithium-sulfur batteries. Nano Today. 2018;**18**:35-64. DOI: 10.1016/j.

[67] Li Z, Jiang Y, Yuan L, Yi Z, Wu C, Liu Y, et al. A highly ordered meso@ micro-porous carbon supported sulfur@smaller-sulfur core-shell structured cathode for Li-S batteries. ACS Nano. 2014;**8**(9):9295-9303. DOI:

Ultrasonics Sonochemistry. 2020;**66**:104901. DOI: 10.1016/j.

[64] Munonde TS, Zheng H,

of NiFe LDH/CB nanosheets for enhanced oxygen evolution catalysis. Ultrasonics Sonochemistry. 2019;**59**:104716. DOI: 10.1016/j.

ultsonch.2019.104901

ultsonch.2019.104716

nantod.2017.12.010

10.1021/nn503220h

[68] Bagotsky VS, Skundin AM,

DOI: 10.1002/9781118942857

[69] Sealy C. The problem with platinum. Materials Today. 2008;**11**(12):65-68. DOI: 10.1016/

[70] Karousos DS, Desdenakis KI, Sakkas PM, Sourkouni G, Pollet BG, Argirusis C. Sonoelectrochemical one-pot synthesis of Pt-carbon black nanocomposite PEMFC electrocatalyst.

2017;**35**(Pt B):591-597. DOI: 10.1016/j.

Ultrasonics Sonochemistry.

ultsonch.2016.05.023

s1369-7021(08)70254-2

Volfkovich MY. Electrochemical Power Sources: Batteries, Fuel Cells, and Supercapacitors. Hoboken: Wiley; 2015.

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

[57] Gnana Sundara Raj B, Asiri AM, Qusti AH, Wu JJ, Anandan S. Sonochemically synthesized MnO2 nanoparticles as electrode material for supercapacitors. Ultrasonics Sonochemistry. 2014;**21**(6):1933-1938. DOI: 10.1016/j.ultsonch.2013.11.018

[58] Ganesh Kumar V, Aurbuch D, Gedanken A. A comparison between hot-hydrolysis and sonolysis of various Mn(II) salts. Ultrasonics Sonochemistry. 2003;**10**(1):17-23. DOI: 10.1016/S1350-4177(02)00091-3

[59] Sivakumar P, Nayak PK,

Sonochemical synthesis of

10.1016/j.ultsonch.2015.02.007

[60] Fan X, Liu J, Song Z, Han X, Deng Y, Zhong C, et al. Porous

nanocomposite gel polymer electrolyte with high ionic conductivity and superior electrolyte retention capability for long-cycle-life flexible zinc-air batteries. Nano Energy. 2019;**56**:454-462. DOI: 10.1016/j.nanoen.2018.11.057

[61] Zhu L, Zhang H. A novel method for the modification of zinc powder by ultrasonic impregnation in cerium nitrate solution. Ultrasonics Sonochemistry. 2008;**15**:393-401. DOI:

[62] Chen L, Zhang Y, Dong L, Liu X, Long L, Wang S, et al. Honeycomblike 3D N-, P-codoped porous carbon anchored with ultrasmall Fe2P

nanocrystals for efficient Zn-air battery.

[63] Chen T-W, Chinnapaiyan S, Chen S-M, Ali MA, Elshikh MS, Lee S-Y, et al. Sonochemical approach to the synthesis of metal tungstate/nafion composite with electrocatalytic properties and its

Carbon. 2020;**158**:885-892. DOI: 10.1016/j.carbon.2019.11.073

10.1016/j.ultsonch.2007.09.016

Markovsky B, Aurbach D, Gedanken A.

LiNi0.5Mn1.5O4 and its electrochemical performance as a cathode material for 5 V Li-ion batteries. Ultrasonics Sonochemistry. 2015;**26**:332-339. DOI: *Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

[57] Gnana Sundara Raj B, Asiri AM, Qusti AH, Wu JJ, Anandan S. Sonochemically synthesized MnO2 nanoparticles as electrode material for supercapacitors. Ultrasonics Sonochemistry. 2014;**21**(6):1933-1938. DOI: 10.1016/j.ultsonch.2013.11.018

*Nanotechnology and the Environment*

ultsonch.2017.08.010

and their nano copper complexes as the precursors for new shaped CuO-NPs. Ultrasonics Sonochemistry. 2018;**40**(Pt A):629-643. DOI: 10.1016/j. [50] Li XL, Li TC, Huang S, Zhang J, Pam ME, Yang HY. Controllable synthesis of two-dimensional molybdenum disulfide (MoS2) for energy-storage applications. ChemSusChem. 2020;**13**(6):1379-1391.

[51] Xu W, Sun C, Zhao K, Cheng X, Rawal S, Xu Y, et al. Defect engineering activating (boosting) zinc storage capacity of MoS2. Energy Storage Materials. 2019;**16**:527-534. DOI: 10.1016/j.ensm.2018.09.009

[52] Liang Y, Feng R, Yang S, Ma H, Liang J, Chen J. Rechargeable Mg batteries with graphene-like MoS(2) cathode and ultrasmall Mg nanoparticle

[53] Liu Y, Li R. Study on ultrasoundassisted liquid-phase exfoliation for preparing graphene-like molybdenum disulfide nanosheets. Ultrasonics Sonochemistry. 2020;**63**:104923. DOI:

10.1016/j.ultsonch.2019.104923

DOI: 10.1002/aenm.201300188

ultsonch.2005.09.010

[55] Kumar VG, Kim KB. Organized and highly dispersed growth of MnO2 nanorods by sonochemical hydrolysis of Mn3 acetate. Ultrasonics Sonochemistry. 2006;**13**(6):549-556. DOI: 10.1016/j.

[56] Okitsu K, Iwatani M, Nanzai B, Nishimura R, Maeda Y. Sonochemical

reduction of permanganate to manganese dioxide: The effects of H2O2 formed in the sonolysis of water on the rates of reduction. Ultrasonics Sonochemistry. 2009;**16**(3):387-391. DOI: 10.1016/j.ultsonch.2008.10.009

[54] Li Y, Yao J, Uchaker E, Yang J, Huang Y, Zhang M, et al. Leaf-like V2O5 nanosheets fabricated by a facile green approach as high energy cathode material for lithium-ion batteries. Advanced Energy Materials. 2013;**3**(9):1171-1175.

anode. Advanced Materials. 2011;**23**(5):640-643. DOI: 10.1002/

adma.201003560

DOI: 10.1002/cssc.201902706

[44] Alavi MA, Morsali A, Joo SW, Min BK. Ultrasound and modulation assisted synthesis of {[Cu2(BDC-NH2)2(dabco)]DMF.3H2O} nanostructures: New precursor to prepare nanorods and nanotubes of copper(II) oxide. Ultrasonics Sonochemistry. 2015;**22**:349-358. DOI:

10.1016/j.ultsonch.2014.04.017

ultsonch.2020.105020

electacta.2019.135141

[45] Hajnorouzi A. Two ultrasonic applications for the synthesis of nanostructured copper oxide (II). Ultrasonics Sonochemistry. 2020;**64**:105020. DOI: 10.1016/j.

[46] Yang Z, Du Y, Hou G, Ouyang Y, Ding F, Yuan F. Nanoporous silicon spheres preparation via a controllable magnesiothermic reduction as anode for Li-ion batteries. Electrochimica Acta. 2020;**329**:135141. DOI: 10.1016/j.

[47] Ge M, Rong J, Fang X, Zhang A, Lu Y, Zhou C. Scalable preparation of porous silicon nanoparticles and their application for lithium-ion battery anodes. Nano Research. 2013;**6**(3): 174-181. DOI: 10.1007/s12274-013-0293-y

[48] Zhao Y, Liu X, Li H, Zhai T,

Communications. 2012;**48**(42): 5079-5081. DOI: 10.1039/c2cc31476b

[49] Cadiz Bedini AP, Klingebiel B, Luysberg M, Carius R. Sonochemical synthesis of hydrogenated amorphous silicon nanoparticles from liquid trisilane at ambient temperature and pressure. Ultrasonics Sonochemistry. 2017;**39**:883-888. DOI: 10.1016/j.

Zhou H. Hierarchical micro/nanoporous silicon Li-ion battery anodes. Chemical

**94**

ultsonch.2017.06.011

[58] Ganesh Kumar V, Aurbuch D, Gedanken A. A comparison between hot-hydrolysis and sonolysis of various Mn(II) salts. Ultrasonics Sonochemistry. 2003;**10**(1):17-23. DOI: 10.1016/S1350-4177(02)00091-3

[59] Sivakumar P, Nayak PK, Markovsky B, Aurbach D, Gedanken A. Sonochemical synthesis of LiNi0.5Mn1.5O4 and its electrochemical performance as a cathode material for 5 V Li-ion batteries. Ultrasonics Sonochemistry. 2015;**26**:332-339. DOI: 10.1016/j.ultsonch.2015.02.007

[60] Fan X, Liu J, Song Z, Han X, Deng Y, Zhong C, et al. Porous nanocomposite gel polymer electrolyte with high ionic conductivity and superior electrolyte retention capability for long-cycle-life flexible zinc-air batteries. Nano Energy. 2019;**56**:454-462. DOI: 10.1016/j.nanoen.2018.11.057

[61] Zhu L, Zhang H. A novel method for the modification of zinc powder by ultrasonic impregnation in cerium nitrate solution. Ultrasonics Sonochemistry. 2008;**15**:393-401. DOI: 10.1016/j.ultsonch.2007.09.016

[62] Chen L, Zhang Y, Dong L, Liu X, Long L, Wang S, et al. Honeycomblike 3D N-, P-codoped porous carbon anchored with ultrasmall Fe2P nanocrystals for efficient Zn-air battery. Carbon. 2020;**158**:885-892. DOI: 10.1016/j.carbon.2019.11.073

[63] Chen T-W, Chinnapaiyan S, Chen S-M, Ali MA, Elshikh MS, Lee S-Y, et al. Sonochemical approach to the synthesis of metal tungstate/nafion composite with electrocatalytic properties and its

electrochemical sensing performance. Ultrasonics Sonochemistry. 2020;**66**:104901. DOI: 10.1016/j. ultsonch.2019.104901

[64] Munonde TS, Zheng H, Nomngongo PN. Ultrasonic exfoliation of NiFe LDH/CB nanosheets for enhanced oxygen evolution catalysis. Ultrasonics Sonochemistry. 2019;**59**:104716. DOI: 10.1016/j. ultsonch.2019.104716

[65] Xie J, Cao X, Li J, Zhan H, Xia Y, Zhou Y. Application of ultrasonic irradiation to the sol-gel synthesis of silver vanadium oxides. Ultrasonics Sonochemistry. 2005;**12**(4):289-293. DOI: 10.1016/j.ultsonch.2004.01.041

[66] Park J, Yu S-H, Sung Y-E. Design of structural and functional nanomaterials for lithium-sulfur batteries. Nano Today. 2018;**18**:35-64. DOI: 10.1016/j. nantod.2017.12.010

[67] Li Z, Jiang Y, Yuan L, Yi Z, Wu C, Liu Y, et al. A highly ordered meso@ micro-porous carbon supported sulfur@smaller-sulfur core-shell structured cathode for Li-S batteries. ACS Nano. 2014;**8**(9):9295-9303. DOI: 10.1021/nn503220h

[68] Bagotsky VS, Skundin AM, Volfkovich MY. Electrochemical Power Sources: Batteries, Fuel Cells, and Supercapacitors. Hoboken: Wiley; 2015. DOI: 10.1002/9781118942857

[69] Sealy C. The problem with platinum. Materials Today. 2008;**11**(12):65-68. DOI: 10.1016/ s1369-7021(08)70254-2

[70] Karousos DS, Desdenakis KI, Sakkas PM, Sourkouni G, Pollet BG, Argirusis C. Sonoelectrochemical one-pot synthesis of Pt-carbon black nanocomposite PEMFC electrocatalyst. Ultrasonics Sonochemistry. 2017;**35**(Pt B):591-597. DOI: 10.1016/j. ultsonch.2016.05.023

[71] Gong K, Du F, Xia Z, Durstock M, Dai L. Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction. Science. 2009;**323**(5915):760-764. DOI: 10.1126/ science.1168049

[72] Mentus S, Abu Rabi A, Jašin D. Oxygen reduction on potentiodynamically formed Pd/TiO2 composite electrodes. Electrochimica Acta. 2012;**69**:174-180. DOI: 10.1016/j. electacta.2012.02.106

[73] Truong-Phuoc L, Pham-Huu C, Da Costa V, Janowska I. Few-layered graphene-supported palladium as a highly efficient catalyst in oxygen reduction reaction. Chemical Communications. 2014;**50**(92): 14433-14435. DOI: 10.1039/c4cc05527f

[74] Padilla RH, Priecel P, Lin M, Lopez-Sanchez JA, Zhong Z. A versatile sonication-assisted deposition-reduction method for preparing supported metal catalysts for catalytic applications. Ultrasonics Sonochemistry. 2017;**35**(Pt B):631-639. DOI: 10.1016/j.ultsonch.2016.01.018

[75] Lee E, Kwon YU. Multi-component electrocatalyst for low-temperature fuel cells synthesized via sonochemical reactions. Ultrasonics Sonochemistry. 2016;**29**:401-412. DOI: 10.1016/j. ultsonch.2015.10.013

[76] Lee E, Jang JH, Matin MA, Kwon YU. One-step sonochemical syntheses of Ni@Pt core-shell nanoparticles with controlled shape and shell thickness for fuel cell electrocatalyst. Ultrasonics Sonochemistry. 2014;**21**(1):317-323. DOI: 10.1016/j.ultsonch.2013.05.006

[77] Park HU, Park AH, Shi W, Park GG, Kwon YU. Ternary core-shell PdM@ Pt (M=Mn and Fe) nanoparticle electrocatalysts with enhanced ORR catalytic properties. Ultrasonics Sonochemistry. 2019;**58**:104673. DOI: 10.1016/j.ultsonch.2019.104673

[78] Anandan S, Wu JJ. Sonochemical synthesis of carbon supported Sn nanoparticles and its electrochemical application. Ultrasonics Sonochemistry. 2014;**21**(6):1954-1957. DOI: 10.1016/j. ultsonch.2014.02.018

[79] Zheng H, Matseke MS, Munonde TS. The unique Pd@Pt/C core-shell nanoparticles as methanoltolerant catalysts using sonochemical synthesis. Ultrasonics Sonochemistry. 2019;**57**:166-171. DOI: 10.1016/j. ultsonch.2019.05.023

[80] Wang H, Zhang W, Bai P, Xu L. Ultrasound-assisted transformation from waste biomass to efficient carbon-based metal-free pH-universal oxygen reduction reaction electrocatalysts. Ultrasonics Sonochemistry. 2020;**65**:105048. DOI: 10.1016/j.ultsonch.2020.105048

[81] Zuo LX, Jiang LP, Abdel-Halim ES, Zhu JJ. Sonochemical preparation of stable porous MnO2 and its application as an efficient electrocatalyst for oxygen reduction reaction. Ultrasonics Sonochemistry. 2017;**35**(Pt A):219-225. DOI: 10.1016/j.ultsonch.2016.09.021

[82] Esmaielzadeh S, Ahmadizadegan H. Construction of proton exchange membranes under ultrasonic irradiation based on novel fluorine functionalizing sulfonated polybenzimidazole/cellulose/ silica bionanocomposite. Ultrasonics Sonochemistry. 2018;**41**:641-650. DOI: 10.1016/j.ultsonch.2017.10.029

[83] Zuo LX, Jiang LP, Zhu JJ. A facile sonochemical route for the synthesis of MoS2/Pd composites for highly efficient oxygen reduction reaction. Ultrasonics Sonochemistry. 2017;**35**(Pt B):681-688. DOI: 10.1016/j.ultsonch.2016.02.006

[84] Hoogers G. Chapter 4: Fuel cell components and their impact on performance. In: Hoogers G, editor. Fuel Cell Technology Handbook. Boca Raton: CRC Press; 2002. pp. 88-114. DOI: 10.1201/9781420041552

**97**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

applications. Physica Status Solidi A: Applications and Materials Science. 2008;**205**(10):2400-2404. DOI: 10.1002/

[93] Argirusis C, Grosse-Brauckmann J, Sourkouni G, Taillades G, Roziere J. Preparation of thin proton conducting membranes by means of EPD. Key Engineering Materials. 2009;**412**: 125-130. DOI: 10.4028/www.scientific.

[94] Szepanski C, Grosse-Brauckmann J, Argirusis C. Electrophoretic deposition as preparation method for intermediate temperature SOFC half cells. Key Engineering Materials. 2009;**412**: 209-214. DOI: 10.4028/www.scientific.

pssa.200779409

net/KEM.412.125

net/KEM.412.209

ssi.2008.12.042

[95] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Batuev L, Muzykantov V, et al. Fe- and Al-doped apatite-type lanthanum silicates: Structure and property characterization. Solid State Ionics. 2009;**180**(11):796-799. DOI: 10.1016/j.

[96] Jothinathan E, Vanmeensel K, Vleugels J, Kharlamova T, Sadykov V, Pavlova S, et al. Apatite type lanthanum silicate and composite anode half cells. Solid State Ionics. 2011;**192**(1):419-423.

DOI: 10.1016/j.ssi.2010.02.009

[97] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Alikina G, Frade J, et al. Anode composites based on NiO and apatite-type lanthanum silicate for intermediate temperature solid oxide fuel cells. MRS Proceedings. 2008;**1098**:104-109. DOI: 10.1557/

[98] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Mezentseva N, Muzykantov V, et al. Perovskite and composite materials for intermediate temperatures solid oxide fuel cells. MRS Proceedings. 2008;**1056**:102-107. DOI:

10.1557/PROC-1056-HH03-64

PROC-1098-HH07-02

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

[86] Islam MH, Burheim OS, Pollet BG. Sonochemical and sonoelectrochemical production of hydrogen. Ultrasonics Sonochemistry. 2019;**51**:533-555. DOI:

[87] Cherepanov PV, Ashokkumar M, Andreeva DV. Ultrasound assisted formation of Al-Ni electrocatalyst for hydrogen evolution. Ultrasonics Sonochemistry. 2015;**23**:142-147. DOI:

[85] Carrette L, Friedrich KA, Stimming U. Fuel cells –

fuce5>3.0.co;2-g

Fundamentals and applications. Fuel Cells. 2001;**1**(1):5-39. DOI: 10.1002/1615-6854(200105)1:1<5::aid-

10.1016/j.ultsonch.2018.08.024

10.1016/j.ultsonch.2014.10.012

[88] Ida S, Wilson P, Neppolian B, Sathish M, Mahammed Shaheer AR, Ravi P. Tuning the type of nitrogen on N-RGO supported on N-TiO2 under ultrasonication/hydrothermal treatment for efficient hydrogen evolution - A mechanistic overview. Ultrasonics Sonochemistry. 2020;**64**:104866. DOI:

10.1016/j.ultsonch.2019.104866

[89] Steele B. Fuel-cell technologyrunning on natural gas. Nature. 1999;**400**:619-621. DOI: 10.1038/23144

[90] Argirusis C, Damjanović T,

[91] Argirusis C, Damjanović T, Borchardt G. Preparation of SOFC cells by means of electrophoretic deposition. Key Engineering Materials. 2006;**314**:101-106. DOI: 10.4028/www.

scientific.net/KEM.314.101

[92] Argirusis C, Matić S, Schneider O. An EQCM study of ultrasonically assisted electrodeposition of Co/CeO2 and Ni/CeO2 composites for fuel cell

Borchardt G. Electrophoretic deposition of thin SOFC-electrolyte films on porous La0.75Sr0.2MnO3-δ cathodes. Materials Science Forum. 2004;**453- 454**:335-342. DOI: 10.4028/www. scientific.net/MSF.453-454.335

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

[85] Carrette L, Friedrich KA, Stimming U. Fuel cells – Fundamentals and applications. Fuel Cells. 2001;**1**(1):5-39. DOI: 10.1002/1615-6854(200105)1:1<5::aidfuce5>3.0.co;2-g

*Nanotechnology and the Environment*

arrays with high electrocatalytic activity for oxygen reduction. Science. 2009;**323**(5915):760-764. DOI: 10.1126/

[72] Mentus S, Abu Rabi A, Jašin D. Oxygen reduction on

electacta.2012.02.106

science.1168049

[71] Gong K, Du F, Xia Z, Durstock M, Dai L. Nitrogen-doped carbon nanotube [78] Anandan S, Wu JJ. Sonochemical synthesis of carbon supported Sn nanoparticles and its electrochemical application. Ultrasonics Sonochemistry. 2014;**21**(6):1954-1957. DOI: 10.1016/j.

ultsonch.2014.02.018

ultsonch.2019.05.023

[79] Zheng H, Matseke MS,

Munonde TS. The unique Pd@Pt/C core-shell nanoparticles as methanoltolerant catalysts using sonochemical synthesis. Ultrasonics Sonochemistry. 2019;**57**:166-171. DOI: 10.1016/j.

[80] Wang H, Zhang W, Bai P, Xu L. Ultrasound-assisted transformation from waste biomass to efficient carbon-based metal-free pH-universal oxygen reduction reaction electrocatalysts. Ultrasonics Sonochemistry. 2020;**65**:105048. DOI: 10.1016/j.ultsonch.2020.105048

[81] Zuo LX, Jiang LP, Abdel-Halim ES, Zhu JJ. Sonochemical preparation of stable porous MnO2 and its application as an efficient electrocatalyst for oxygen reduction reaction. Ultrasonics Sonochemistry. 2017;**35**(Pt A):219-225. DOI: 10.1016/j.ultsonch.2016.09.021

[82] Esmaielzadeh S, Ahmadizadegan H. Construction of proton exchange membranes under ultrasonic irradiation based on novel fluorine functionalizing sulfonated polybenzimidazole/cellulose/ silica bionanocomposite. Ultrasonics Sonochemistry. 2018;**41**:641-650. DOI:

10.1016/j.ultsonch.2017.10.029

[83] Zuo LX, Jiang LP, Zhu JJ. A facile sonochemical route for the synthesis of MoS2/Pd composites for highly efficient oxygen reduction reaction. Ultrasonics Sonochemistry. 2017;**35**(Pt B):681-688. DOI: 10.1016/j.ultsonch.2016.02.006

[84] Hoogers G. Chapter 4: Fuel cell components and their impact on

10.1201/9781420041552

performance. In: Hoogers G, editor. Fuel Cell Technology Handbook. Boca Raton: CRC Press; 2002. pp. 88-114. DOI:

potentiodynamically formed Pd/TiO2 composite electrodes. Electrochimica Acta. 2012;**69**:174-180. DOI: 10.1016/j.

[73] Truong-Phuoc L, Pham-Huu C, Da Costa V, Janowska I. Few-layered graphene-supported palladium as a highly efficient catalyst in oxygen reduction reaction. Chemical Communications. 2014;**50**(92): 14433-14435. DOI: 10.1039/c4cc05527f

[74] Padilla RH, Priecel P, Lin M, Lopez-Sanchez JA, Zhong Z. A versatile sonication-assisted deposition-reduction method for preparing supported metal catalysts for catalytic applications. Ultrasonics Sonochemistry. 2017;**35**(Pt B):631-639. DOI: 10.1016/j.ultsonch.2016.01.018

[75] Lee E, Kwon YU. Multi-component electrocatalyst for low-temperature fuel cells synthesized via sonochemical reactions. Ultrasonics Sonochemistry. 2016;**29**:401-412. DOI: 10.1016/j.

[76] Lee E, Jang JH, Matin MA, Kwon YU. One-step sonochemical syntheses of Ni@Pt core-shell nanoparticles with controlled shape and shell thickness for fuel cell electrocatalyst. Ultrasonics Sonochemistry. 2014;**21**(1):317-323. DOI: 10.1016/j.ultsonch.2013.05.006

[77] Park HU, Park AH, Shi W, Park GG, Kwon YU. Ternary core-shell PdM@ Pt (M=Mn and Fe) nanoparticle electrocatalysts with enhanced ORR catalytic properties. Ultrasonics Sonochemistry. 2019;**58**:104673. DOI: 10.1016/j.ultsonch.2019.104673

ultsonch.2015.10.013

**96**

[86] Islam MH, Burheim OS, Pollet BG. Sonochemical and sonoelectrochemical production of hydrogen. Ultrasonics Sonochemistry. 2019;**51**:533-555. DOI: 10.1016/j.ultsonch.2018.08.024

[87] Cherepanov PV, Ashokkumar M, Andreeva DV. Ultrasound assisted formation of Al-Ni electrocatalyst for hydrogen evolution. Ultrasonics Sonochemistry. 2015;**23**:142-147. DOI: 10.1016/j.ultsonch.2014.10.012

[88] Ida S, Wilson P, Neppolian B, Sathish M, Mahammed Shaheer AR, Ravi P. Tuning the type of nitrogen on N-RGO supported on N-TiO2 under ultrasonication/hydrothermal treatment for efficient hydrogen evolution - A mechanistic overview. Ultrasonics Sonochemistry. 2020;**64**:104866. DOI: 10.1016/j.ultsonch.2019.104866

[89] Steele B. Fuel-cell technologyrunning on natural gas. Nature. 1999;**400**:619-621. DOI: 10.1038/23144

[90] Argirusis C, Damjanović T, Borchardt G. Electrophoretic deposition of thin SOFC-electrolyte films on porous La0.75Sr0.2MnO3-δ cathodes. Materials Science Forum. 2004;**453- 454**:335-342. DOI: 10.4028/www. scientific.net/MSF.453-454.335

[91] Argirusis C, Damjanović T, Borchardt G. Preparation of SOFC cells by means of electrophoretic deposition. Key Engineering Materials. 2006;**314**:101-106. DOI: 10.4028/www. scientific.net/KEM.314.101

[92] Argirusis C, Matić S, Schneider O. An EQCM study of ultrasonically assisted electrodeposition of Co/CeO2 and Ni/CeO2 composites for fuel cell

applications. Physica Status Solidi A: Applications and Materials Science. 2008;**205**(10):2400-2404. DOI: 10.1002/ pssa.200779409

[93] Argirusis C, Grosse-Brauckmann J, Sourkouni G, Taillades G, Roziere J. Preparation of thin proton conducting membranes by means of EPD. Key Engineering Materials. 2009;**412**: 125-130. DOI: 10.4028/www.scientific. net/KEM.412.125

[94] Szepanski C, Grosse-Brauckmann J, Argirusis C. Electrophoretic deposition as preparation method for intermediate temperature SOFC half cells. Key Engineering Materials. 2009;**412**: 209-214. DOI: 10.4028/www.scientific. net/KEM.412.209

[95] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Batuev L, Muzykantov V, et al. Fe- and Al-doped apatite-type lanthanum silicates: Structure and property characterization. Solid State Ionics. 2009;**180**(11):796-799. DOI: 10.1016/j. ssi.2008.12.042

[96] Jothinathan E, Vanmeensel K, Vleugels J, Kharlamova T, Sadykov V, Pavlova S, et al. Apatite type lanthanum silicate and composite anode half cells. Solid State Ionics. 2011;**192**(1):419-423. DOI: 10.1016/j.ssi.2010.02.009

[97] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Alikina G, Frade J, et al. Anode composites based on NiO and apatite-type lanthanum silicate for intermediate temperature solid oxide fuel cells. MRS Proceedings. 2008;**1098**:104-109. DOI: 10.1557/ PROC-1098-HH07-02

[98] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Mezentseva N, Muzykantov V, et al. Perovskite and composite materials for intermediate temperatures solid oxide fuel cells. MRS Proceedings. 2008;**1056**:102-107. DOI: 10.1557/PROC-1056-HH03-64

[99] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Alikina G, Argirusis C. Catalytic properties and coking stability of new anode materials for internal methane reforming in the intermediate temperature solid oxide fuel cells. Catalysis Today. 2009;**146**(1-2):141-147. DOI: 10.1016/j. cattod.2009.01.052

[100] Jiang S, Chan SH. A review of anode materials development in solid oxide fuel cells. Journal of Materials Science. 2004;**39**:4405-4439. DOI: 10.1023/B:JMSC.0000034135.52164.6b

[101] Sakkas PM, Bozes CY, Kanellopoulou DG, Sourkouni G, Argirusis C. A study on the synchronous decoration of molybdenum oxide or tungsten oxide nanoparticles on anode materials for natural gas fed solid oxide fuel cells using ultrasounds. Ultrasonics Sonochemistry. 2019;**59**:104715. DOI: 10.1016/j.ultsonch.2019.104715

[102] Okkay H, Bayramoglu M, Oksuzomer MF. Ce0.8Sm0.2O1.9 synthesis for solid oxide fuel cell electrolyte by ultrasound assisted co-precipitation method. Ultrasonics Sonochemistry. 2013;**20**(3):978-983. DOI: 10.1016/j. ultsonch.2012.10.013

[103] Pinjari DV, Pandit AB. Room temperature synthesis of crystalline CeO2 nanopowder: Advantage of sonochemical method over conventional method. Ultrasonics Sonochemistry. 2011;**18**(5):1118-1123. DOI: 10.1016/j. ultsonch.2011.01.008

[104] Gohari Derakhshandeh P, Soleimannejad J. Sonochemical synthesis of a new nano-sized cerium(III) supramolecular compound; precursor for nanoceria. Ultrasonics Sonochemistry. 2016;**31**:122-128. DOI: 10.1016/j.ultsonch.2015.12.014

[105] Yang G, Zhou Y, Pan HB, Zhu C, Fu S, Wai CM, et al. Ultrasonic-assisted synthesis of Pd-Pt/carbon nanotubes

nanocomposites for enhanced electrooxidation of ethanol and methanol in alkaline medium. Ultrasonics Sonochemistry. 2016;**28**:192-198. DOI: 10.1016/j.ultsonch.2015.07.021

[106] Douk AS, Saravani H, Farsadrooh M, Noroozifar M. An environmentally friendly one-pot synthesis method by the ultrasound assistance for the decoration of ultrasmall Pd-Ag NPs on graphene as high active anode catalyst towards ethanol oxidation. Ultrasonics Sonochemistry. 2019;**58**:104616. DOI: 10.1016/j. ultsonch.2019.104616

[107] Farsadrooh M, Noroozifar M, Modarresi-Alam AR, Saravani H. Sonochemical synthesis of highperformance Pd@CuNWs/ MWCNTs-CH electrocatalyst by galvanic replacement toward ethanol oxidation in alkaline media. Ultrasonics Sonochemistry. 2019;**51**:478-486. DOI: 10.1016/j.ultsonch.2018.06.011

[108] Sakkas PM, Schneider O, Sourkouni G, Argirusis C. Sonochemistry in the service of SOFC research. Ultrasonics Sonochemistry. 2014;**21**(6):1939-1947. DOI: 10.1016/j. ultsonch.2014.02.001

[109] Sakkas P, Schneider O, Martens S, Thanou P, Sourkouni G, Argirusis C. Fundamental studies of sonoelectrochemical nanomaterials preparation. Journal of Applied Electrochemistry. 2012;**42**(9):763-777. DOI: 10.1007/s10800-012-0443-z

[110] Islam MH, Paul MTY, Burheim OS, Pollet BG. Recent developments in the sonoelectrochemical synthesis of nanomaterials. Ultrasonics Sonochemistry. 2019;**59**:104711. DOI: 10.1016/j.ultsonch.2019.104711

[111] Colomer MT, Anderson MA. High porosity silica xerogels prepared by a particulate sol-gel route: Pore structure and proton conductivity. Journal of Non-Crystalline Solids.

**99**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

[119] Cheng C, Amini A, Zhu C, Xu Z, Song H, Wang N. Enhanced photocatalytic performance of TiO2- ZnO hybrid nanostructures. Scientific Reports. 2014;**4**:4181. DOI: 10.1038/

[120] Hunge YM, Yadav AA, Mathe VL. Ultrasound assisted synthesis of WO3-ZnO nanocomposites for brilliant blue dye degradation. Ultrasonics Sonochemistry. 2018;**45**:116-122. DOI:

10.1016/j.ultsonch.2018.02.052

[121] Mohite VS, Mahadik MA, Kumbhar SS, Hunge YM, Kim JH, Moholkar AV, et al.

10.1016/j.jphotobiol.2014.12.004

[122] Hunge YM, Mahadik MA, Moholkar AV, Bhosale CH.

Photoelectrocatalytic degradation of oxalic acid using WO3 and stratified WO3/TiO2 photocatalysts under sunlight illumination. Ultrasonics Sonochemistry. 2017;**35**(Pt A):233-242. DOI: 10.1016/j.ultsonch.2016.09.024

[123] Vallejo W, Rueda A, Diaz-Uribe C, Grande C, Quintana P. Photocatalytic activity of graphene oxide-TiO2 thin films sensitized by natural dyes

extracted from *Bactris guineensis*. Royal Society Open Science. 2019;**6**(3):181824.

[124] Xie H, Liu B, Zhao X. Facile process to greatly improve the photocatalytic activity of the TiO2 thin film on window glass for the photodegradation of acetone and benzene. Chemical Engineering Journal. 2016;**284**:1156-1164.

DOI: 10.1098/rsos.181824

DOI: 10.1016/j.cej.2015.09.049

[125] Jiang L, Wang Y, Feng C. Application of photocatalytic technology in environmental safety. Procedia Engineering. 2012;**45**:993-997. DOI: 10.1016/j.proeng.2012.08.271

Photoelectrocatalytic degradation of benzoic acid using Au doped TiO2 thin films. Journal of Photochemistry and Photobiology. B. 2015;**142**:204-211. DOI:

srep04181

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

2001;**290**(2):93-104. DOI: 10.1016/

[113] Wu C, Liu L, Tang K, Chen T. Studies on an ultrasonic atomization feed direct methanol fuel cell. Ultrasonics Sonochemistry. 2017;**34**:60-66. DOI: 10.1016/j.ultsonch.2016.05.018

[114] Wu C, Wu J, Luo H, Wang S, Chen T. Ultrasonic radiation to enable improvement of direct methanol fuel cell. Ultrasonics Sonochemistry. 2016;**29**:363-370. DOI: 10.1016/j.

[115] Hunge YM. Basics and advanced developments in photocatalysis – A review (mini review). International Journal of Hydrology. 2018;**2**(4):539-540.

DOI: 10.15406/ijh.2018.02.00122

Semiconductor photocatalysis - past, present, and future outlook. Journal of Physical Chemistry Letters. 2012;**3**(5):673-677. DOI: 10.1021/

[118] Stucchi M, Bianchi CL, Pirola C, Cerrato G, Morandi S, Argirusis C, et al. Copper NPs decorated titania: A novel synthesis by high energy US with a study of the photocatalytic activity under visible light. Ultrasonics Sonochemistry. 2016;**31**:295-301. DOI:

10.1016/j.ultsonch.2016.01.015

[116] Serpone N, Emeline AV.

[117] Stucchi M, Bianchi CL, Argirusis C, Pifferi V, Neppolian B, Cerrato G, et al. Ultrasound assisted synthesis of Ag-decorated TiO2 active in visible light. Ultrasonics Sonochemistry. 2018;**40**(Pt A):282-288. DOI: 10.1016/j.

ultsonch.2017.07.016

jz300071j

ultsonch.2015.10.012

S0022-3093(01)00815-8

[112] Cortes AD, Donatti DA, Ibanez Ruiz A, Vollet DR. A kinetic study of the effect of ultrasound power on the sonohydrolysis of tetraethyl orthosilicate. Ultrasonics Sonochemistry. 2007;**14**(6):711-716. DOI: 10.1016/j.ultsonch.2006.12.002 *Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

2001;**290**(2):93-104. DOI: 10.1016/ S0022-3093(01)00815-8

*Nanotechnology and the Environment*

[99] Kharlamova T, Pavlova S, Sadykov V, Krieger T, Alikina G, Argirusis C. Catalytic properties and coking stability of new anode materials for internal methane reforming in the intermediate temperature solid oxide fuel cells. Catalysis Today. 2009;**146**(1-2):141-147. DOI: 10.1016/j.

nanocomposites for enhanced electrooxidation of ethanol and methanol in alkaline medium. Ultrasonics Sonochemistry. 2016;**28**:192-198. DOI:

[106] Douk AS, Saravani H, Farsadrooh M, Noroozifar M. An environmentally friendly one-pot synthesis method by the ultrasound assistance for the decoration of ultrasmall Pd-Ag NPs on graphene as high active anode catalyst towards ethanol oxidation. Ultrasonics Sonochemistry. 2019;**58**:104616. DOI: 10.1016/j.

10.1016/j.ultsonch.2015.07.021

ultsonch.2019.104616

[107] Farsadrooh M, Noroozifar M, Modarresi-Alam AR, Saravani H. Sonochemical synthesis of highperformance Pd@CuNWs/ MWCNTs-CH electrocatalyst by galvanic replacement toward ethanol oxidation in alkaline media. Ultrasonics Sonochemistry. 2019;**51**:478-486. DOI:

10.1016/j.ultsonch.2018.06.011

[108] Sakkas PM, Schneider O, Sourkouni G, Argirusis C.

ultsonch.2014.02.001

[109] Sakkas P, Schneider O,

Martens S, Thanou P, Sourkouni G, Argirusis C. Fundamental studies of sonoelectrochemical nanomaterials preparation. Journal of Applied Electrochemistry. 2012;**42**(9):763-777. DOI: 10.1007/s10800-012-0443-z

[110] Islam MH, Paul MTY, Burheim OS, Pollet BG. Recent developments in the sonoelectrochemical synthesis of nanomaterials. Ultrasonics

Sonochemistry. 2019;**59**:104711. DOI: 10.1016/j.ultsonch.2019.104711

[111] Colomer MT, Anderson MA. High porosity silica xerogels prepared by a particulate sol-gel route: Pore structure and proton conductivity. Journal of Non-Crystalline Solids.

Sonochemistry in the service of SOFC research. Ultrasonics Sonochemistry. 2014;**21**(6):1939-1947. DOI: 10.1016/j.

[100] Jiang S, Chan SH. A review of anode materials development in solid oxide fuel cells. Journal of Materials Science. 2004;**39**:4405-4439. DOI: 10.1023/B:JMSC.0000034135.52164.6b

[101] Sakkas PM, Bozes CY, Kanellopoulou DG, Sourkouni G, Argirusis C. A study on the synchronous decoration of molybdenum oxide or tungsten oxide nanoparticles on anode materials for natural gas fed solid oxide fuel cells using ultrasounds. Ultrasonics Sonochemistry. 2019;**59**:104715. DOI: 10.1016/j.ultsonch.2019.104715

[102] Okkay H, Bayramoglu M,

[103] Pinjari DV, Pandit AB. Room temperature synthesis of crystalline CeO2 nanopowder: Advantage of

[104] Gohari Derakhshandeh P, Soleimannejad J. Sonochemical synthesis of a new nano-sized

10.1016/j.ultsonch.2015.12.014

sonochemical method over conventional method. Ultrasonics Sonochemistry. 2011;**18**(5):1118-1123. DOI: 10.1016/j.

cerium(III) supramolecular compound; precursor for nanoceria. Ultrasonics Sonochemistry. 2016;**31**:122-128. DOI:

[105] Yang G, Zhou Y, Pan HB, Zhu C, Fu S, Wai CM, et al. Ultrasonic-assisted synthesis of Pd-Pt/carbon nanotubes

ultsonch.2012.10.013

ultsonch.2011.01.008

Oksuzomer MF. Ce0.8Sm0.2O1.9 synthesis for solid oxide fuel cell electrolyte by ultrasound assisted co-precipitation method. Ultrasonics Sonochemistry. 2013;**20**(3):978-983. DOI: 10.1016/j.

cattod.2009.01.052

**98**

[112] Cortes AD, Donatti DA, Ibanez Ruiz A, Vollet DR. A kinetic study of the effect of ultrasound power on the sonohydrolysis of tetraethyl orthosilicate. Ultrasonics Sonochemistry. 2007;**14**(6):711-716. DOI: 10.1016/j.ultsonch.2006.12.002

[113] Wu C, Liu L, Tang K, Chen T. Studies on an ultrasonic atomization feed direct methanol fuel cell. Ultrasonics Sonochemistry. 2017;**34**:60-66. DOI: 10.1016/j.ultsonch.2016.05.018

[114] Wu C, Wu J, Luo H, Wang S, Chen T. Ultrasonic radiation to enable improvement of direct methanol fuel cell. Ultrasonics Sonochemistry. 2016;**29**:363-370. DOI: 10.1016/j. ultsonch.2015.10.012

[115] Hunge YM. Basics and advanced developments in photocatalysis – A review (mini review). International Journal of Hydrology. 2018;**2**(4):539-540. DOI: 10.15406/ijh.2018.02.00122

[116] Serpone N, Emeline AV. Semiconductor photocatalysis - past, present, and future outlook. Journal of Physical Chemistry Letters. 2012;**3**(5):673-677. DOI: 10.1021/ jz300071j

[117] Stucchi M, Bianchi CL, Argirusis C, Pifferi V, Neppolian B, Cerrato G, et al. Ultrasound assisted synthesis of Ag-decorated TiO2 active in visible light. Ultrasonics Sonochemistry. 2018;**40**(Pt A):282-288. DOI: 10.1016/j. ultsonch.2017.07.016

[118] Stucchi M, Bianchi CL, Pirola C, Cerrato G, Morandi S, Argirusis C, et al. Copper NPs decorated titania: A novel synthesis by high energy US with a study of the photocatalytic activity under visible light. Ultrasonics Sonochemistry. 2016;**31**:295-301. DOI: 10.1016/j.ultsonch.2016.01.015

[119] Cheng C, Amini A, Zhu C, Xu Z, Song H, Wang N. Enhanced photocatalytic performance of TiO2- ZnO hybrid nanostructures. Scientific Reports. 2014;**4**:4181. DOI: 10.1038/ srep04181

[120] Hunge YM, Yadav AA, Mathe VL. Ultrasound assisted synthesis of WO3-ZnO nanocomposites for brilliant blue dye degradation. Ultrasonics Sonochemistry. 2018;**45**:116-122. DOI: 10.1016/j.ultsonch.2018.02.052

[121] Mohite VS, Mahadik MA, Kumbhar SS, Hunge YM, Kim JH, Moholkar AV, et al. Photoelectrocatalytic degradation of benzoic acid using Au doped TiO2 thin films. Journal of Photochemistry and Photobiology. B. 2015;**142**:204-211. DOI: 10.1016/j.jphotobiol.2014.12.004

[122] Hunge YM, Mahadik MA, Moholkar AV, Bhosale CH. Photoelectrocatalytic degradation of oxalic acid using WO3 and stratified WO3/TiO2 photocatalysts under sunlight illumination. Ultrasonics Sonochemistry. 2017;**35**(Pt A):233-242. DOI: 10.1016/j.ultsonch.2016.09.024

[123] Vallejo W, Rueda A, Diaz-Uribe C, Grande C, Quintana P. Photocatalytic activity of graphene oxide-TiO2 thin films sensitized by natural dyes extracted from *Bactris guineensis*. Royal Society Open Science. 2019;**6**(3):181824. DOI: 10.1098/rsos.181824

[124] Xie H, Liu B, Zhao X. Facile process to greatly improve the photocatalytic activity of the TiO2 thin film on window glass for the photodegradation of acetone and benzene. Chemical Engineering Journal. 2016;**284**:1156-1164. DOI: 10.1016/j.cej.2015.09.049

[125] Jiang L, Wang Y, Feng C. Application of photocatalytic technology in environmental safety. Procedia Engineering. 2012;**45**:993-997. DOI: 10.1016/j.proeng.2012.08.271

[126] Qin Z, Su T, Ji H. Photocatalytic nanomaterials for the energy and environmental application. In: Multifunctional Nanocomposites for Energy and Environmental Applications. Vol. 1. New York: Wiley; 2018. pp. 353-401. DOI: 10.1002/9783527342501.ch13

[127] Muhammad NA, Wang Y, Muhammad FE, He T. Photoreduction of carbon dioxide using strontium zirconate nanoparticles. Science China Materials. 2015;**58**(8):634-639. DOI: 10.1007/s40843-015-0077-7

[128] Akhter P, Hussain M, Saracco G, Russo N. Novel nanostructured-TiO2 materials for the photocatalytic reduction of CO2 greenhouse gas to hydrocarbons and syngas. Fuel. 2015;**149**:55-65. DOI: 10.1016/j.fuel.2014.09.079

[129] Chen J, Xin F, Yin X, Xiang T, Wang Y. Synthesis of hexagonal and cubic ZnIn2S4 nanosheets for the photocatalytic reduction of CO2 with methanol. RSC Advances. 2015;**5**(5):3833-3839. DOI: 10.1039/ c4ra13191f

[130] Ghows N, Entezari MH. Sonosynthesis of core-shell nanocrystal (CdS/TiO2) without surfactant. Ultrasonics Sonochemistry. 2012;**19**(5):1070-1078. DOI: 10.1016/j. ultsonch.2012.01.009

[131] Mousavi-Kamazani M, Salavati-Niasari M, Emadi H. Preparation of stochiometric CuInS2 nanostructures by ultrasonic method. Micro & Nano Letters. 2012;**7**(9):896-900. DOI: 10.1049/mnl.2012.0393

[132] Kolny-Olesiak J, Weller H. Synthesis and application of colloidal CuInS2 semiconductor nanocrystals. ACS Applied Materials & Interfaces. 2013;**5**(23): 12221-12237. DOI: 10.1021/am404084d

[133] Kansaard T, Pecharapa W. Characterization of BiVO4 nanoparticles prepared by sonochemical process. Ferroelectrics. 2019;**552**(1):140-147. DOI: 10.1080/00150193.2019.1653090

[134] Liu S, Zhang N, Tang ZR, Xu YJ. Synthesis of one-dimensional CdS@ TiO(2) core-shell nanocomposites photocatalyst for selective redox: The dual role of TiO(2) shell. ACS Applied Materials & Interfaces. 2012;**4**(11): 6378-6385. DOI: 10.1021/am302074p

[135] Koltypin Y, Nikitenko SI, Gedanken A. The sonochemical preparation of tungsten oxide nanoparticles. Journal of Materials Chemistry. 2002;**12**(4):1107-1110. DOI: 10.1039/b106036h

[136] Wang L, Wang Y, Cheng Y, Liu Z, Guo Q, Ha MN, et al. Hydrogen-treated mesoporous WO3 as a reducing agent of CO2 to fuels (CH4 and CH3OH) with enhanced photothermal catalytic performance. Journal of Materials Chemistry A. 2016;**4**(14):5314-5322. DOI: 10.1039/c5ta10180h

[137] Jin J, Yu J, Guo D, Cui C, Ho W. A hierarchical Z-scheme CdS-WO3 photocatalyst with enhanced CO2 reduction activity. Small. 2015;**11**(39):5262-5271. DOI: 10.1002/ smll.201500926

[138] Dong Y-z, Xue Y-s, Yang W-w, You H-m, Su Y. Visible light driven CdS/ WO3 inverse opals with enhanced RhB degradation activity. Colloids and Surfaces A. 2019;**561**:381-387. DOI: 10.1016/j.colsurfa.2018.10.033

[139] Wang S, Guan BY, Lou XWD. Construction of ZnIn2S4-In2O3 hierarchical tubular heterostructures for efficient CO2 photoreduction. Journal of the American Chemical Society. 2018;**140**(15):5037-5040. DOI: 10.1021/ jacs.8b02200

[140] Yuan J, Hao C. Solar-driven photoelectrochemical reduction of carbon dioxide to methanol at CuInS2

**101**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

determination based on the unique catalytic chemiluminescence of metalorganic framework HKUST-1. Sensors and Actuators B: Chemical. 2015;**210**: 500-507. DOI: 10.1016/j.snb.2015.01.012

[149] Bobbitt NS, Mendonca ML, Howarth AJ, Islamoglu T, Hupp JT, Farha OK, et al. Metal-organic frameworks for the removal of toxic industrial chemicals and chemical warfare agents. Chemical Society Reviews. 2017;**46**(11):3357-3385. DOI:

[150] Hu Z, Deibert BJ, Li J. Luminescent

metal-organic frameworks for chemical sensing and explosive detection. Chemical Society Reviews. 2014;**43**(16):5815-5840. DOI: 10.1039/

[151] Li X, Liu Y, Wang J, Gascon J, Li J, Van der Bruggen B. Metal-organic frameworks based membranes for liquid separation. Chemical Society Reviews. 2017;**46**(23):7124-7144. DOI: 10.1039/

[152] Abazari R, Reza Mahjoub A, Slawin AMZ, Carpenter-Warren CL. Morphology- and size-controlled synthesis of a metal-organic framework under ultrasound irradiation: An efficient carrier for pH responsive release of anti-cancer drugs and their applicability for adsorption of amoxicillin from aqueous solution. Ultrasonics Sonochemistry. 2018;**42**:594-608. DOI: 10.1016/j.

[153] Fang Y, Ma Y, Zheng M, Yang P, Asiri AM, Wang X. Metal-organic frameworks for solar energy conversion by photoredox catalysis. Coordination Chemistry Reviews. 2018;**373**:83-115.

DOI: 10.1016/j.ccr.2017.09.013

[154] Rajpurohit AS, Punde NS, Srivastava AK. A dual metal organic framework based on copper-iron clusters integrated sulphur doped

10.1039/c7cs00108h

c4cs00010b

c7cs00575j

ultsonch.2017.12.032

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

thin film photocathode. Solar Energy Materials and Solar Cells. 2013;**108**:170- 174. DOI: 10.1016/j.solmat.2012.09.024

[141] Paz FA, Klinowski J, Vilela SM, Tome JP, Cavaleiro JA, Rocha J. Ligand design for functional metal-organic frameworks. Chemical Society Reviews. 2012;**41**(3):1088-1110. DOI: 10.1039/

[142] Yaghi OM, O'Keeffe M,

Ockwig NW, Chae HK, Eddaoudi M, Kim J. Reticular synthesis and the design of new materials. Nature. 2003;**423**(6941):705-714. DOI: 10.1038/

[143] Zhao D, Timmons DJ, Yuan D, Zhou HC. Tuning the topology and functionality of metal-organic frameworks by ligand design. Accounts of Chemical Research. 2011;**44**(2): 123-133. DOI: 10.1021/ar100112y

[144] Ma S, Zhou HC. A metal-organic framework with entatic metal centers exhibiting high gas adsorption affinity. Journal of the American Chemical Society. 2006;**128**(36):11734-11735.

[145] González-Zamora E, Ibarra IA. CO2 capture under humid conditions in metal-organic frameworks. Materials Chemistry Frontiers. 2017;**1**(8): 1471-1484. DOI: 10.1039/c6qm00301j

[146] Li JR, Sculley J, Zhou HC. Metalorganic frameworks for separations. Chemical Reviews. 2012;**112**(2):869-932.

[147] Liu J, Chen L, Cui H, Zhang J, Zhang L, Su CY. Applications of metalorganic frameworks in heterogeneous supramolecular catalysis. Chemical Society Reviews. 2014;**43**(16):6011-6061.

DOI: 10.1021/ja063538z

DOI: 10.1021/cr200190s

DOI: 10.1039/c4cs00094c

[148] Zhu Q, Chen Y, Wang W, Zhang H, Ren C, Chen H, et al. A sensitive biosensor for dopamine

c1cs15055c

nature01650

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

thin film photocathode. Solar Energy Materials and Solar Cells. 2013;**108**:170- 174. DOI: 10.1016/j.solmat.2012.09.024

*Nanotechnology and the Environment*

[127] Muhammad NA, Wang Y,

10.1007/s40843-015-0077-7

10.1016/j.fuel.2014.09.079

c4ra13191f

Muhammad FE, He T. Photoreduction of carbon dioxide using strontium zirconate nanoparticles. Science China Materials. 2015;**58**(8):634-639. DOI:

[128] Akhter P, Hussain M, Saracco G, Russo N. Novel nanostructured-TiO2 materials for the photocatalytic reduction of CO2 greenhouse gas to hydrocarbons and syngas. Fuel. 2015;**149**:55-65. DOI:

[129] Chen J, Xin F, Yin X, Xiang T, Wang Y. Synthesis of hexagonal and cubic ZnIn2S4 nanosheets for the photocatalytic reduction of CO2 with methanol. RSC Advances. 2015;**5**(5):3833-3839. DOI: 10.1039/

[130] Ghows N, Entezari MH. Sonosynthesis of core-shell nanocrystal (CdS/TiO2) without surfactant. Ultrasonics Sonochemistry.

2012;**19**(5):1070-1078. DOI: 10.1016/j.

[131] Mousavi-Kamazani M, Salavati-Niasari M, Emadi H. Preparation of stochiometric CuInS2 nanostructures by ultrasonic method. Micro & Nano Letters. 2012;**7**(9):896-900. DOI:

[132] Kolny-Olesiak J, Weller H. Synthesis and application of colloidal CuInS2

semiconductor nanocrystals. ACS Applied

Characterization of BiVO4 nanoparticles

Materials & Interfaces. 2013;**5**(23): 12221-12237. DOI: 10.1021/am404084d

[133] Kansaard T, Pecharapa W.

ultsonch.2012.01.009

10.1049/mnl.2012.0393

[126] Qin Z, Su T, Ji H. Photocatalytic nanomaterials for the energy and environmental application. In: Multifunctional Nanocomposites for Energy and Environmental Applications. Vol. 1. New York: Wiley; 2018. pp. 353-401. DOI: 10.1002/9783527342501.ch13

prepared by sonochemical process. Ferroelectrics. 2019;**552**(1):140-147. DOI: 10.1080/00150193.2019.1653090

[134] Liu S, Zhang N, Tang ZR, Xu YJ. Synthesis of one-dimensional CdS@ TiO(2) core-shell nanocomposites photocatalyst for selective redox: The dual role of TiO(2) shell. ACS Applied Materials & Interfaces. 2012;**4**(11): 6378-6385. DOI: 10.1021/am302074p

[135] Koltypin Y, Nikitenko SI, Gedanken A. The sonochemical preparation of tungsten oxide nanoparticles. Journal of Materials Chemistry. 2002;**12**(4):1107-1110. DOI:

[136] Wang L, Wang Y, Cheng Y, Liu Z, Guo Q, Ha MN, et al. Hydrogen-treated mesoporous WO3 as a reducing agent of CO2 to fuels (CH4 and CH3OH) with enhanced photothermal catalytic performance. Journal of Materials Chemistry A. 2016;**4**(14):5314-5322.

[137] Jin J, Yu J, Guo D, Cui C, Ho W. A hierarchical Z-scheme CdS-WO3 photocatalyst with enhanced CO2 reduction activity. Small. 2015;**11**(39):5262-5271. DOI: 10.1002/

[138] Dong Y-z, Xue Y-s, Yang W-w, You H-m, Su Y. Visible light driven CdS/ WO3 inverse opals with enhanced RhB degradation activity. Colloids and Surfaces A. 2019;**561**:381-387. DOI: 10.1016/j.colsurfa.2018.10.033

[139] Wang S, Guan BY, Lou XWD. Construction of ZnIn2S4-In2O3

[140] Yuan J, Hao C. Solar-driven photoelectrochemical reduction of carbon dioxide to methanol at CuInS2

hierarchical tubular heterostructures for efficient CO2 photoreduction. Journal of the American Chemical Society. 2018;**140**(15):5037-5040. DOI: 10.1021/

10.1039/b106036h

DOI: 10.1039/c5ta10180h

smll.201500926

jacs.8b02200

**100**

[141] Paz FA, Klinowski J, Vilela SM, Tome JP, Cavaleiro JA, Rocha J. Ligand design for functional metal-organic frameworks. Chemical Society Reviews. 2012;**41**(3):1088-1110. DOI: 10.1039/ c1cs15055c

[142] Yaghi OM, O'Keeffe M, Ockwig NW, Chae HK, Eddaoudi M, Kim J. Reticular synthesis and the design of new materials. Nature. 2003;**423**(6941):705-714. DOI: 10.1038/ nature01650

[143] Zhao D, Timmons DJ, Yuan D, Zhou HC. Tuning the topology and functionality of metal-organic frameworks by ligand design. Accounts of Chemical Research. 2011;**44**(2): 123-133. DOI: 10.1021/ar100112y

[144] Ma S, Zhou HC. A metal-organic framework with entatic metal centers exhibiting high gas adsorption affinity. Journal of the American Chemical Society. 2006;**128**(36):11734-11735. DOI: 10.1021/ja063538z

[145] González-Zamora E, Ibarra IA. CO2 capture under humid conditions in metal-organic frameworks. Materials Chemistry Frontiers. 2017;**1**(8): 1471-1484. DOI: 10.1039/c6qm00301j

[146] Li JR, Sculley J, Zhou HC. Metalorganic frameworks for separations. Chemical Reviews. 2012;**112**(2):869-932. DOI: 10.1021/cr200190s

[147] Liu J, Chen L, Cui H, Zhang J, Zhang L, Su CY. Applications of metalorganic frameworks in heterogeneous supramolecular catalysis. Chemical Society Reviews. 2014;**43**(16):6011-6061. DOI: 10.1039/c4cs00094c

[148] Zhu Q, Chen Y, Wang W, Zhang H, Ren C, Chen H, et al. A sensitive biosensor for dopamine

determination based on the unique catalytic chemiluminescence of metalorganic framework HKUST-1. Sensors and Actuators B: Chemical. 2015;**210**: 500-507. DOI: 10.1016/j.snb.2015.01.012

[149] Bobbitt NS, Mendonca ML, Howarth AJ, Islamoglu T, Hupp JT, Farha OK, et al. Metal-organic frameworks for the removal of toxic industrial chemicals and chemical warfare agents. Chemical Society Reviews. 2017;**46**(11):3357-3385. DOI: 10.1039/c7cs00108h

[150] Hu Z, Deibert BJ, Li J. Luminescent metal-organic frameworks for chemical sensing and explosive detection. Chemical Society Reviews. 2014;**43**(16):5815-5840. DOI: 10.1039/ c4cs00010b

[151] Li X, Liu Y, Wang J, Gascon J, Li J, Van der Bruggen B. Metal-organic frameworks based membranes for liquid separation. Chemical Society Reviews. 2017;**46**(23):7124-7144. DOI: 10.1039/ c7cs00575j

[152] Abazari R, Reza Mahjoub A, Slawin AMZ, Carpenter-Warren CL. Morphology- and size-controlled synthesis of a metal-organic framework under ultrasound irradiation: An efficient carrier for pH responsive release of anti-cancer drugs and their applicability for adsorption of amoxicillin from aqueous solution. Ultrasonics Sonochemistry. 2018;**42**:594-608. DOI: 10.1016/j. ultsonch.2017.12.032

[153] Fang Y, Ma Y, Zheng M, Yang P, Asiri AM, Wang X. Metal-organic frameworks for solar energy conversion by photoredox catalysis. Coordination Chemistry Reviews. 2018;**373**:83-115. DOI: 10.1016/j.ccr.2017.09.013

[154] Rajpurohit AS, Punde NS, Srivastava AK. A dual metal organic framework based on copper-iron clusters integrated sulphur doped

graphene as a porous material for supercapacitor with remarkable performance characteristics. Journal of Colloid and Interface Science. 2019;**553**:328-340. DOI: 10.1016/j. jcis.2019.06.031

[155] Vayenas M, Vaitsis C, Sourkouni G, Pandis PK, Argirusis C. Investigation of alternative materials as bifunctional catalysts for electrochemical applications. Chimica Techno Acta. 2019;**6**(4):120-129. DOI: 10.15826/ chimtech.2019.6.4.01

[156] Ren Y, Chia GH, Gao Z. Metal-organic frameworks in fuel cell technologies. Nano Today. 2013;**8**(6):577-597. DOI: 10.1016/j. nantod.2013.11.004

[157] Tranchemontagne DJ, Hunt JR, Yaghi OM. Room temperature synthesis of metal-organic frameworks: MOF-5, MOF-74, MOF-177, MOF-199, and IRMOF-0. Tetrahedron. 2008;**64**(36):8553-8557. DOI: 10.1016/j. tet.2008.06.036

[158] Choi J-S, Son W-J, Kim J, Ahn W-S. Metal-organic framework MOF-5 prepared by microwave heating: Factors to be considered. Microporous and Mesoporous Materials. 2008;**116**(1-3):727-731. DOI: 10.1016/j. micromeso.2008.04.033

[159] Wu X, Bao Z, Yuan B, Wang J, Sun Y, Luo H, et al. Microwave synthesis and characterization of MOF-74 (M=Ni, Mg) for gas separation. Microporous and Mesoporous Materials. 2013;**180**:114-122. DOI: 10.1016/j. micromeso.2013.06.023

[160] Martinez Joaristi A, Juan-Alcañiz J, Serra-Crespo P, Kapteijn F, Gascon J. Electrochemical synthesis of some archetypical Zn2+, Cu2+, and Al3+ metal organic frameworks. Crystal Growth & Design. 2012;**12**(7):3489-3498. DOI: 10.1021/cg300552w

[161] Klimakow M, Klobes P, Thünemann AF, Rademann K, Emmerling F. Mechanochemical synthesis of metal-organic frameworks: A fast and facile approach toward quantitative yields and high specific surface areas. Chemistry of Materials. 2010;**22**(18):5216-5221. DOI: 10.1021/ cm1012119

[162] Kleist W, Maciejewski M, Baiker A. MOF-5 based mixed-linker metalorganic frameworks: Synthesis, thermal stability and catalytic application. Thermochimica Acta. 2010;**499**(1-2): 71-78. DOI: 10.1016/j.tca.2009.11.004

[163] Sun W, Zhai X, Zhao L. Synthesis of ZIF-8 and ZIF-67 nanocrystals with wellcontrollable size distribution through reverse microemulsions. Chemical Engineering Journal. 2016;**289**:59-64. DOI: 10.1016/j.cej.2015.12.076

[164] da Silva GG, Silva CS, Ribeiro RT, Ronconi CM, Barros BS, Neves JL, et al. Sonoelectrochemical synthesis of metalorganic frameworks. Synthetic Metals. 2016;**220**:369-373. DOI: 10.1016/j. synthmet.2016.07.003

[165] Qiu LG, Li ZQ, Wu Y, Wang W, Xu T, Jiang X. Facile synthesis of nanocrystals of a microporous metal-organic framework by an ultrasonic method and selective sensing of organoamines. Chemical Communications. 2008;**31**:3642-3644. DOI: 10.1039/b804126a

[166] Son WJ, Kim J, Kim J, Ahn WS. Sonochemical synthesis of MOF-5. Chemical Communications. 2008;**47**:6336-6338. DOI: 10.1039/ b814740j

[167] Li Z-Q, Qiu L-G, Wang W, Xu T, Wu Y, Jiang X. Fabrication of nanosheets of a fluorescent metalorganic framework [Zn(BDC)(H2O)] n (BDC=1,4-benzenedicarboxylate): Ultrasonic synthesis and sensing of ethylamine. Inorganic Chemistry

**103**

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications*

of amide-functionalized metalorganic framework/graphene oxide nanocomposite for the adsorption of methylene blue from aqueous solution. Ultrasonics Sonochemistry. 2018;**41**:189-195. DOI: 10.1016/j.

[175] Zhao S, Chen D, Wei F, Chen N, Liang Z, Luo Y. Removal of Congo red dye from aqueous solution with nickel-based metal-organic framework/ graphene oxide composites prepared by ultrasonic wave-assisted ball milling. Ultrasonics Sonochemistry. 2017;**39**:845-852. DOI: 10.1016/j.

[176] Abazari R, Salehi G, Mahjoub AR. Ultrasound-assisted preparation of a nanostructured zinc(II) amine pillar metal-organic framework as a potential sorbent for 2,4-dichlorophenol adsorption from aqueous solution. Ultrasonics Sonochemistry. 2018;**46**:59- 67. DOI: 10.1016/j.ultsonch.2018.02.001

[177] Abazari R, Mahjoub AR. Ultrasound-assisted synthesis of zinc(II)-based metal organic framework nanoparticles in the presence of modulator for adsorption enhancement of 2,4-dichlorophenol and amoxicillin. Ultrasonics Sonochemistry.

2018;**42**:577-584. DOI: 10.1016/j.

[179] Abbasi AR, Rizvandi M,

DOI: 10.1016/j.jcis.2016.03.018

[178] Abbasi AR, Rizvandi M. Influence of the ultrasound-assisted synthesis of Cu-BTC metal-organic frameworks nanoparticles on uptake and release properties of rifampicin. Ultrasonics Sonochemistry. 2018;**40**(Pt A):465-471. DOI: 10.1016/j.ultsonch.2017.07.041

Azadbakht A, Rostamnia S. Controlled uptake and release of imatinib from ultrasound nanoparticles Cu3(BTC)2 metal-organic framework in comparison with bulk structure. Journal of Colloid and Interface Science. 2016;**471**:112-117.

ultsonch.2017.12.027

ultsonch.2017.09.030

ultsonch.2017.06.013

*DOI: http://dx.doi.org/10.5772/intechopen.92802*

Communications. 2008;**11**(11):1375-1377. DOI: 10.1016/j.inoche.2008.09.010

[168] Haque E, Khan NA, Park JH, Jhung SH. Synthesis of a metal-organic framework material, iron terephthalate,

by ultrasound, microwave, and

10.1016/j.ultsonch.2018.11.004

[170] Vaitsis C, Sourkouni G,

scitotenv.2020.137088

s11356-018-3519-4

ultsonch.2017.01.007

[174] Tanhaei M, Mahjoub AR, Safarifard V. Sonochemical synthesis

chem.200902382

conventional electric heating: A kinetic study. Chemistry - A European Journal. 2010;**16**(3):1046-1052. DOI: 10.1002/

[169] Vaitsis C, Sourkouni G, Argirusis C. Metal organic frameworks (MOFs) and ultrasound: A review. Ultrasonics Sonochemistry. 2019;**52**:106-119. DOI:

Argirusis C. Sonochemical synthesis of MOFs. In: Mozafari M, editor. Metal-Organic Frameworks for Biomedical Applications. Cambridge: Woodhead Publishing; 2020. pp. 223-244. DOI: 10.1016/B978-0-12-816984-1.00013-5

[171] Zorpas AA. Strategy development in the framework of waste management. Science of the Total Environment. 2020;**716**:137088. DOI: 10.1016/j.

[172] Loizia P, Neofytou N, Zorpas AA. The concept of circular economy strategy in food waste management for the optimization of energy production through anaerobic digestion. Environmental Science and Pollution Research International. 2019;**26**(15):14766-14773. DOI: 10.1007/

[173] Abbasi AR, Karimi M, Daasbjerg K. Efficient removal of crystal violet and methylene blue from wastewater by ultrasound nanoparticles Cu-MOF in comparison with mechanosynthesis method. Ultrasonics Sonochemistry. 2017;**37**:182-191. DOI: 10.1016/j.

*Ultrasound-Assisted Preparation Methods of Nanoparticles for Energy-Related Applications DOI: http://dx.doi.org/10.5772/intechopen.92802*

Communications. 2008;**11**(11):1375-1377. DOI: 10.1016/j.inoche.2008.09.010

*Nanotechnology and the Environment*

graphene as a porous material for supercapacitor with remarkable performance characteristics. Journal of Colloid and Interface Science. 2019;**553**:328-340. DOI: 10.1016/j.

[161] Klimakow M, Klobes P, Thünemann AF, Rademann K, Emmerling F. Mechanochemical synthesis of metal-organic frameworks: A fast and facile approach toward quantitative yields and high specific surface areas. Chemistry of Materials. 2010;**22**(18):5216-5221. DOI: 10.1021/

[162] Kleist W, Maciejewski M, Baiker A. MOF-5 based mixed-linker metalorganic frameworks: Synthesis, thermal stability and catalytic application. Thermochimica Acta. 2010;**499**(1-2): 71-78. DOI: 10.1016/j.tca.2009.11.004

[163] Sun W, Zhai X, Zhao L. Synthesis of ZIF-8 and ZIF-67 nanocrystals with wellcontrollable size distribution through reverse microemulsions. Chemical Engineering Journal. 2016;**289**:59-64.

[164] da Silva GG, Silva CS, Ribeiro RT, Ronconi CM, Barros BS, Neves JL, et al. Sonoelectrochemical synthesis of metalorganic frameworks. Synthetic Metals. 2016;**220**:369-373. DOI: 10.1016/j.

[165] Qiu LG, Li ZQ, Wu Y, Wang W, Xu T, Jiang X. Facile synthesis of nanocrystals of a microporous metal-organic framework by an ultrasonic method and selective sensing of organoamines. Chemical Communications. 2008;**31**:3642-3644.

[166] Son WJ, Kim J, Kim J, Ahn WS. Sonochemical synthesis of MOF-5. Chemical Communications. 2008;**47**:6336-6338. DOI: 10.1039/

[167] Li Z-Q, Qiu L-G, Wang W, Xu T, Wu Y, Jiang X. Fabrication of nanosheets of a fluorescent metalorganic framework [Zn(BDC)(H2O)] n (BDC=1,4-benzenedicarboxylate): Ultrasonic synthesis and sensing of ethylamine. Inorganic Chemistry

DOI: 10.1016/j.cej.2015.12.076

synthmet.2016.07.003

DOI: 10.1039/b804126a

b814740j

cm1012119

[155] Vayenas M, Vaitsis C, Sourkouni G, Pandis PK, Argirusis C. Investigation of alternative materials as bifunctional

catalysts for electrochemical applications. Chimica Techno Acta. 2019;**6**(4):120-129. DOI: 10.15826/

[156] Ren Y, Chia GH, Gao Z. Metal-organic frameworks in fuel cell technologies. Nano Today. 2013;**8**(6):577-597. DOI: 10.1016/j.

[157] Tranchemontagne DJ, Hunt JR, Yaghi OM. Room temperature

[158] Choi J-S, Son W-J, Kim J, Ahn W-S. Metal-organic framework MOF-5 prepared by microwave heating: Factors to be considered. Microporous and Mesoporous Materials. 2008;**116**(1-3):727-731. DOI: 10.1016/j.

[159] Wu X, Bao Z, Yuan B, Wang J, Sun Y, Luo H, et al. Microwave synthesis and characterization of MOF-74 (M=Ni, Mg) for gas separation. Microporous and Mesoporous Materials.

2013;**180**:114-122. DOI: 10.1016/j.

[160] Martinez Joaristi A, Juan-Alcañiz J, Serra-Crespo P, Kapteijn F, Gascon J. Electrochemical synthesis of some archetypical Zn2+, Cu2+, and Al3+ metal organic frameworks. Crystal Growth & Design. 2012;**12**(7):3489-3498. DOI:

synthesis of metal-organic frameworks: MOF-5, MOF-74, MOF-177, MOF-199, and IRMOF-0. Tetrahedron. 2008;**64**(36):8553-8557. DOI: 10.1016/j.

chimtech.2019.6.4.01

nantod.2013.11.004

tet.2008.06.036

micromeso.2008.04.033

micromeso.2013.06.023

10.1021/cg300552w

jcis.2019.06.031

**102**

[168] Haque E, Khan NA, Park JH, Jhung SH. Synthesis of a metal-organic framework material, iron terephthalate, by ultrasound, microwave, and conventional electric heating: A kinetic study. Chemistry - A European Journal. 2010;**16**(3):1046-1052. DOI: 10.1002/ chem.200902382

[169] Vaitsis C, Sourkouni G, Argirusis C. Metal organic frameworks (MOFs) and ultrasound: A review. Ultrasonics Sonochemistry. 2019;**52**:106-119. DOI: 10.1016/j.ultsonch.2018.11.004

[170] Vaitsis C, Sourkouni G, Argirusis C. Sonochemical synthesis of MOFs. In: Mozafari M, editor. Metal-Organic Frameworks for Biomedical Applications. Cambridge: Woodhead Publishing; 2020. pp. 223-244. DOI: 10.1016/B978-0-12-816984-1.00013-5

[171] Zorpas AA. Strategy development in the framework of waste management. Science of the Total Environment. 2020;**716**:137088. DOI: 10.1016/j. scitotenv.2020.137088

[172] Loizia P, Neofytou N, Zorpas AA. The concept of circular economy strategy in food waste management for the optimization of energy production through anaerobic digestion. Environmental Science and Pollution Research International. 2019;**26**(15):14766-14773. DOI: 10.1007/ s11356-018-3519-4

[173] Abbasi AR, Karimi M, Daasbjerg K. Efficient removal of crystal violet and methylene blue from wastewater by ultrasound nanoparticles Cu-MOF in comparison with mechanosynthesis method. Ultrasonics Sonochemistry. 2017;**37**:182-191. DOI: 10.1016/j. ultsonch.2017.01.007

[174] Tanhaei M, Mahjoub AR, Safarifard V. Sonochemical synthesis of amide-functionalized metalorganic framework/graphene oxide nanocomposite for the adsorption of methylene blue from aqueous solution. Ultrasonics Sonochemistry. 2018;**41**:189-195. DOI: 10.1016/j. ultsonch.2017.09.030

[175] Zhao S, Chen D, Wei F, Chen N, Liang Z, Luo Y. Removal of Congo red dye from aqueous solution with nickel-based metal-organic framework/ graphene oxide composites prepared by ultrasonic wave-assisted ball milling. Ultrasonics Sonochemistry. 2017;**39**:845-852. DOI: 10.1016/j. ultsonch.2017.06.013

[176] Abazari R, Salehi G, Mahjoub AR. Ultrasound-assisted preparation of a nanostructured zinc(II) amine pillar metal-organic framework as a potential sorbent for 2,4-dichlorophenol adsorption from aqueous solution. Ultrasonics Sonochemistry. 2018;**46**:59- 67. DOI: 10.1016/j.ultsonch.2018.02.001

[177] Abazari R, Mahjoub AR. Ultrasound-assisted synthesis of zinc(II)-based metal organic framework nanoparticles in the presence of modulator for adsorption enhancement of 2,4-dichlorophenol and amoxicillin. Ultrasonics Sonochemistry. 2018;**42**:577-584. DOI: 10.1016/j. ultsonch.2017.12.027

[178] Abbasi AR, Rizvandi M. Influence of the ultrasound-assisted synthesis of Cu-BTC metal-organic frameworks nanoparticles on uptake and release properties of rifampicin. Ultrasonics Sonochemistry. 2018;**40**(Pt A):465-471. DOI: 10.1016/j.ultsonch.2017.07.041

[179] Abbasi AR, Rizvandi M, Azadbakht A, Rostamnia S. Controlled uptake and release of imatinib from ultrasound nanoparticles Cu3(BTC)2 metal-organic framework in comparison with bulk structure. Journal of Colloid and Interface Science. 2016;**471**:112-117. DOI: 10.1016/j.jcis.2016.03.018

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Section 4

Nanocomposite Materials:

Sustainable Environment

Section 4
