Fabrication of three-dimensional structured graphene for supercapacitors

Three-dimensional (3D) structured graphene (rGO) has been successfully fabricated from electrochemical reduction of graphite oxide (GO) and ultrasonic treatment. The material was characterized by atomic force microscopy, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results show well-defined and cross-linked structures of pores of several micrometers. The 3D-structured graphene was investigated as an electrode material for supercapacitors by using galvanostatic charge/discharge (DC) , cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). A specific capacitance as high as 140 F/g has been observed at scan rate of 10 mV/s, indicating excellent properties of high efficiency and cycle performance of the electrode materials.