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MnO2/reduced graphene oxide (RGO) composites are synthesized by a simple hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM).The electrochemical properties of MnO2/RGO composites for supercapacitors are tested by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS).