采用机械化学法制备了MnO2粉体,研究了不同高锰酸钾与乙酸锰配比对产物结构与性能的影响.用X射线衍射、红外光谱、扫描电镜、BET等方法研究了产物的结构及形貌;用恒电流充放电方法考察了MnO2超级电容器在6 mol/L KOH电解液中的电容性能.结果表明,原料中乙酸锰含量增多,产物结晶度增大,颗粒粒径变小,但电极比电容却从504F/g减小到388 F/g;当高锰酸钾:乙酸锰摩尔配比为2:2和2:3时,所得产物超级电容器在200 mA/g电流,0～1 V范围,电极放电容量分别达到了504 F/g和516 F/g.放电过程中,MnO2超级电容器在不同电压范围表现出不同的电容特性:在1～0.67 V和0.4～0 V范围内主要为双电层电容,在0.67～0.4 V范围内主要是法拉第假电容.
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