中文摘要：

应用乙炔黑直接还原高锰酸钾制备MnO2/C复合材料.样品结构及性能由XRD和SEM表征.研究了MnO2/C电极（正极）在不同电解液中的法拉第“准电容行为”,及其循环伏安、交流阻抗与恒电流充放电等性能.实验表明,MnO2/C复合材料具有良好的电化学电容特性.在1 mol/L的KOH电解液中和电流密度为5 mA/cm^2下,MnO2/C复合材料的比电容量可达258 F/g,并表现出良好的循环性能.

英文摘要：

The MnO2/C composite was synthesized by reduction of KMnO4 with acetylene black. The products were characterized by XRD and SEM. We used MnO2/C composite as the positive electrode material of the electrochemical capacitor. The performance of faradic psedocapacitance of the MnO2/C electrode was studied in dif- ferent electrolytes. The MnO2/C electrode was tested by cyclic voltammetry, electrochemical impedance spectroscopy （EIS） and constant charge-discharge curves. The experimental results showed that the MnO2/C composite has excellent performance. The specific capacitance of the MnO2/C composite as 258 F/g is obtained at 5mA/cm^2 current density in lmoL/L KOH solution. It exhibited high discharge capacity and good cycle performance.