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Graphene oxide (GO) film was electrochemically reduced by a cyclic voltammetry technique in 6 mol L-1 KOH aqueous solution.Electrochemically reduced graphene oxide (ER-GO) film was characterized by X-ray diffraction,X-ray photoelectron spectroscopy,atomic force microscopy,and Raman spectroscopy.The oxygen content (with the O/C atomic ratio of 1.29%) was significantly decreased after electrochemical reduction.The ER-GO film exhibited a specific capacitance of 152 F g-1 at the current density of 5 A g-1 and a good rate capability.Furthermore,the ER-GO film showed an excellent cycling ability.The capacitance retention remained 99% after 3000 cycles at the current density of 10 A g-1.
Graphene oxide (GO) film was electrochemically reduced by a cyclic voltammetry technique in 6 mol L -1 KOH aqueous solution. Electrochemically reduced graphene oxide (GO-GO) film was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, and Raman spectroscopy. The oxygen content (with the O / C atomic ratio of 1.29%) was significantly decreased after electrochemical reduction. The ER-GO film exhibited a specific capacitance of 152 F g-1 at the current density of 5 A g-1 and a good rate capability. Fermentmore, the ER-GO film showed an excellent cycling ability. The capacitance retention was 99% after 3000 cycles at the current density of 10 A g-1.