Abstract: Carboxyl graphene-based polypyrrole(CG/ppy) modified electrode was prepared and its electrochemical properties were investigated via cyclic voltammetry and AC impedance. Additionally, galvanostatic charge-discharge tests and cycle stability tests were performed. Experimental results show that the CG/ppy significantly improves the current response of the bare electrode and reduces the resistance of the bare electrode in the supporting electrolyte. The specific capacitance of the CG/ppy modified electrode is up to 584 F/g and retains 81% of the initial value after 1000 cycles. Therefore CG/ppy modified electrode has potential application value in the field of electrochemical area.

Key words: Carboxyl Graphene, Polypyrrole, Modified electrode, Supercapacitor