▎ 摘　　要

In this paper, polyaniline-graphene (PANI-G) composites were obtained through in situ polymerization of aniline in a suspension of graphite oxide, followed by reduction of hydrazine. The structure characteristic of the composites was characterized by fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, X-ray diffraction and scanning electron microscopy. Electrochemical performance of the composites as electrode materials was studied by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results showed that the redox state of PANI was emeraldine base in hydrazine treated composites and the PANI-G composites exhibited a layered structure with increasing graphene ratio in composites. The PANI-G composites had good electrochemical performance in acid electrolyte, indicating the emeraldine base form of PANI can be doped into the conductive emeraldine salt form. The specific capacitance of the PANI-G composites increased and charge-transfer resistance decreased with increasing graphene ratio in composites. (C) 2013 Elsevier B.V. All rights reserved.