**6. Application of colloidal graphene**

The colloidal dispersion of graphene produced by the electrochemical exfoliation method is ideal for the preparation of the graphene based flexible paper electrodes. For this, colloidal graphene is coated using brush coating method on A4 paper and dried. These graphene based flexible paper electrodes are used for the preparation of the flexible energy storage devices [8]. First a gel electrolyte is prepared by using PVA (polyvinyl alcohol) and water [34], then two graphene based paper electrodes are joined using this gel electrolyte in between electrodes. Later, two aluminum foils are joined to form the contacts with these electrodes for taking various measurements of these flexible energy storage devices (**Figure 4**). The actual fabricated flexible energy storage device using colloidal graphene is shown in **Figure 5**.

The performance of the flexible energy storage devices is measured by the CV Curves [8]. Further, the type of the gel electrolyte changes the shape of the CV curve measured and hence the performance of the energy storage device.

**39**

**Author details**

flexible energy storage devices.

**Conflict of interests**

**7. Conclusion**

**Figure 5.**

Randhir Singh

*Recent Progress in the Electrochemical Exfoliation of Colloidal Graphene: A Review*

Different flexible energy storage devices can be prepared by using various gel electrolytes and their performance can be compared to obtain the most suitable

This review article discusses electrochemical synthesis of colloidal graphene. Colloidal form of graphene is better than other forms of graphene available because of its solution route is easy to be used for the formation of graphene based electrodes. It is observed that electrochemical exfoliation of graphite is the simple, time saving and economical method for the production of colloidal form of graphene. Various aqueous electrolytes can be used for the electrochemical exfoliation of graphene from graphite. After the colloidal solution is obtained it is used for the preparation of the flexible paper electrodes which are suitable for the formation of

gel electrolyte for the preparation of the flexible energy storage devices.

*The flexible energy storage device fabricated using colloidal graphene.*

Department of Electronics and Communication Engineering, University Institute

© 2021 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,

of Engineering and Technology, Kurukshetra University, Haryana, India

Address all correspondence to: mr\_randhir\_singh@yahoo.co.in

The authors declare no conflict of interests.

provided the original work is properly cited.

*DOI: http://dx.doi.org/10.5772/intechopen.95522*

*Recent Progress in the Electrochemical Exfoliation of Colloidal Graphene: A Review DOI: http://dx.doi.org/10.5772/intechopen.95522*

**Figure 5.** *The flexible energy storage device fabricated using colloidal graphene.*

Different flexible energy storage devices can be prepared by using various gel electrolytes and their performance can be compared to obtain the most suitable gel electrolyte for the preparation of the flexible energy storage devices.
