▎ 摘　　要

Electrochemically reduced graphene was used as the key element in the preparation of electric double-layer capacitors where the thickness of the electrode was only a few hundred nano-meters. The resultant electrodes showed different specific capacitances after pre-reduction with scanning potential windows of -1.0 to 1.6V, -1.5 to 0 V and -1.0 to 1.0 V. Also, a specific capacitance of 246 F/g was obtained as the graphene oxide electrode was reduced with an applied potential of -1.0 to 1.0 V for 4000 s. The influence of the residual oxygen functional groups and sp(2) domains in electrochemically reduced graphene were investigated for capacitance performance. (C) 2012 Elsevier Ltd. All rights reserved.