比较了不同碱溶液中纳米Mn3O4的制备及其超级电容性能.用X射线粉末衍射仪、扫描电子显微镜和原子力显微镜等技术手段分别测试了晶体结构和表面形貌.用循环伏安、恒流充放电和交流阻抗测试了材料的电化学性能.结果表明,在氢氧化钠、氨水中Mn2+沉淀氧化可以直接制备纳米Mn3O4;碳酸钠中先生成MnCO3,加氢氧化钠可转化为纳米Mn3O4.NaOH、NH3和Na2CO3 3种介质中制备的Mn3O4晶粒尺寸分别为29.5、20.2和36.3 nm.纳米Mn3O4经连续充放电循环后可活化为Birnessite-type MnO2.氨水中制备的Mn3O4活化后比容量最大,达到239 F/g,是一种具有应用前景的超级电容器材料.
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