Study on electrochemical properties of rGO film and fabrication of rGO/MnO2 nanocomposite film for high capacitance hybrid-type supercapacitor

Abstract

Graphene is a two-dimensional material with excellent electrical and mechanical properties, and has been attracting attention as a very promising material as a supercapacitor material. Since the electrode material of a supercapacitor requires high energy density and power density, the high specific surface area of electrode and the wettability of the electrolyte are important. Although graphene has excellent properties, graphene tends to be graphitized due to the pi-pi interaction between the graphene faces. This has the effect of reducing the electrical capacity by reducing the surface area of graphene and significantly lowering the wettability of the electrolyte. In this study, changes in the electrochemical properties of the reduced graphene oxide films prepared by controlling the degree of reduction from graphene oxide to hydrazine treatment as a reducing agent were observed, and the mechanism was investigated through C-AFM. Furthermore, for the application of a high-capacity supercapacitor, manganese oxide, a pseudo material, was fabricated into nano-sized by applying a powder pulverization method, and a study was conducted to increase the electric capacitance by making nanocomposite film.