Abstract

With improvement of global economy, the fatigue of energy becomes inevitable in twenty-first century. It is expected that the increase of world energy requirements will be triple at the end of this century. Thus, there is an imperative need for development of renewable energy sources and storage systems. Among various energy storage systems, supercapacitors are ascertained one of the most significant storage devices. But the development of supercapacitor devices with high power and energy density are the greatest challenges for modern research. In this article, transition metal oxides such as TiO2-V2O5, NiMn2O4 etc. with porous structure are considered as high performance supercapacitors electrode. The effects of its structural, morphological and electrochemical properties have been studied extensively. A TiO2-V2O5 and NiMn2O4 based electrode delivered specific capacitance of 310 and 875 F g<sup>1</sup> , respectively at a scan rate 2 mV s<sup>1</sup> . This TiO2-V2O5 based asymmetric supercapacitor also exhibits excellent device performance with specific energy 20.18 W h kg<sup>1</sup> at specific power 5.94 kW kg<sup>1</sup> , and retained 88.0% specific capacitance at current density of 10 A g<sup>1</sup> after 5000 cycles.

Keywords: supercapacitor, transition metal oxides, nanostructure, energy density, power density
