▎ 摘　　要

Thermally reduced graphene oxide (RGO)/MnO2, composites were prepared by the thermal reduction of graphene. oxide (GO)/MnO2, composites. The structure, electrical conductivity and specific capacitance of the composites before and after thermal reduction were investigated by SEM, XRD, FT-IR, the four-pointprobe method and cyclic voltammetry. Results showed that the GO and RGO significantly decreased the agglomeration of MnO2. The RGO/MnO2 composites had higher specific capacitances than pure MnO2, or GO/MnO2 composites. A RGO/MnO2 composite reduced at 600 degrees C had the highest specific capacitance of 321 F . g(-1) and good stability upon cycling. The presence of an optimum reduction temperature could be accounted for by the fact that the thermal reduction decreased the amount of oxygen-containing functional groups that contribute to pseudocapacitance in GO and increased its electrical conductivity which favors a capacitance increase.