采用简单的水热合成法制备了基于石墨基底的多孔α-MnO2薄膜电极.用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)、BET氮气吸附法和热重分析(TG)对产物进行表征,结果表明,沉积得到了由纳米棒交织而成的网络结构的α-MnO2薄膜.用循环伏安法和恒流充放电法对其电化学性能进行研究,结果显示,在1 mol· L-1Na2 SO4溶液中,电流密度为1A·g-1时,α-MnO2薄膜的比电容可达到229 F· g-1,该电极材料在2A·g-1的电流密度下进行2000次循环,电极容量的衰减仅为2％.
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