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出 处:《电化学》2007年第3期279-283,共5页Journal of Electrochemistry
基 金:国家自然科学基金(项目编号:90606015);福建省科技计划(2006H0089)课题资助
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/cm2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.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.
关 键 词:电化学电容 MnO2/C复合材料 比电容
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