利用高锰酸钾和硫酸锰溶液之间的化学共沉淀法制备出氧化锰作为超级电容器的活性电极材料.通过循环伏安法和恒流充放电法,研究了不同热处理温度获得的氧化锰电极,不同循环次数以及不同放电电流条件下,在1mol/L Na2SO4水溶液中的电容特性.结果表明,经低温处理的氧化锰在电位窗口为-0.2～+0.8 V(vs SCE)范围内,表现出典型的电容行为.其中经45℃和80℃处理的氧化锰在放电电流为7.32mA/cm2条件下,比容量分别为147.97F/g和112.26F/g.80℃处理的氧化锰电极循环性能较好.
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