COMPARISON OF HYDROGEN PLASMA AND HYDRAZINE HYDRATE REDUCING GRAPHENE OXIDE FOR CAPACITIVE PERFORMANCE

Two different kinds of reduced graphene oxide was prepared through hydrogen plasma and hydrazine hydrate reducing graphene oxide.The morphology and structure of reduced graphene oxide was characterized by Transmission Electron Microscope(TEM),X-Ray Powder Diffraction and Raman spectrum.The capacitive performance of reduced graphene oxide was investigated by cyclic voltammetry,galvanostatic charging-discharging and electro-chemical impedance spectroscopy.The result shows that Hydrazine hydrate reduction can make the product form favorable three dimensional structure,which can enhance the ion transportation ability of graphene.And the degree of reduction is high.Hydrogen plasma reduction,which needs less time,safe and reliable,can reduce the structure destruction during the reduction process.When the charging-discharging current density is 1 A/g,the specific capacitance of hydrogen plasma reducing graphene oxide can reach 178 F/g,while the specific capacitance of hydrazine hydrate reducing graphene is 119 F/g.