椰壳炭与MnO2复合电极双电层电容行为研究

Study on the mixture of coconut activatied carbon and pyrolysate of KMnO4 as electrode of double-layer capacitor

采用自行制备的KMnO4热解产物MnO2（M）及其与市售高比表面积椰壳基活性炭（YK）复合分别作电极材料，以1和7mol／L KOH为电解液，分别组装戍双电层电容器，采用恒流充放电法、循环伏安测试法和交流阻抗法考察其电容性能，结果显示，当YK与M以质量比1：1混合均匀作电极材料时，其比容量和功率特性均显示最佳值，尤其在高浓度KOH溶液中性能更好，在电流密度为50mA／g时，比电容量达到309．6F／g，并且功率特性和循环性能良好。

A home-made pyrolysate of KMnO4（M） and its mixture with a bought coconut activated carbon （YK） were choosen as electrode materials,respectively. The double layer capacitors（EDLC） were tested by constant charge-discharge and cyclic voltammetry in l mol/L KOH and 7mol/L KOH.The result shows that EDLC has perfect performance of capacitance when M and MY mixing at 1：1 in weight, especially in high concentration of KOH.The electrode can provide a specific capacitance of 309.6F/g at 50mA/g and have good cycle life.