纳米MnO_2超级电容器的研究

Research on Nanophase MnO_2 for Electrochemical Supercapacitor

用固相合成法制备纳米MnO2,作为超级电容器材料,通过循环伏安、交流阻抗与恒电流充放电等测试手段对MnO2电极进行分析.结果表明,以1mol·L-1KOH为电解液,MnO2电极在-0.1～0.6V(vs.Hg/HgO)的电压范围内具有良好的法拉第电容性能.在不同电流密度下,电极比容量达240.25到325.21F·g-1.恒电流充放电5000次后,电极容量衰减不超过10%.

The nanophase MnO2 was synthesized by solid-phase reaction as electrode material for electrochemical supercapacitor and the MnO2 electrode was tested by cyclic voltammetry(CV), electrochemical impedance spectrometry (EIS) and constant charge-discharge curves. The result shows that MnO2 electrode has good performance of faradic pseudocapacitance in 1mol . L-1 KOH between -0.1 and 0.6 V (vs Hg/HgO). The electrode can provide a specific capacitance of 240.25 to 325. 21 F . g(-1) at different current densities. After 5000 cycles of constant charge-discharge the capacitance reduces no more than 10%.