采用简单的水热法制备了具有均一八面分子筛(OMS-2)结构的隐甲锰矿型二氧化锰(MnO2)；通过水热反应温度控制 Mn O 2的微纳结构,研究反应温度对其超级电容器性能的影响。采用扫描电子显微镜(SEM)、X 射线衍射(XRD)和透射电子显微镜(TEM)表征材料的结构特点；采用循环伏安和恒流充放电测试其电化学电容性能。结果表明,制备的Mn O 2具有纳米刺或纳米棒形成放射状结构,随着反应温度的增加,Mn O 2晶体逐渐生长完全,从针状纳米刺转变成四方形纳米棒；制备的 Mn O 2具有双电层电容和法拉第准电容的双重特征,在5 mA/cm2的电流密度下,最高比电容达到了603 F/g；在100~180℃的范围内,比容量随着反应温度的升高而逐渐降低。
In this article,the uniform cryptomelane-type manganese oxide with an octahedral molecular sieves structure was prepared under mild hydrothermal condition;the effects of hydrothermal temperature on the mi-cro-nanostructure and supercapacitance properties of manganese dioxide were studied in detail.The structures were characterized by SEM,XRD and TEM;and the supercapacitive behaviors were investigated with cyclic voltammetry,galvanostatic charge and discharge tests.The experiment results suggested that:the prepared nanoparticles can be self-organized into dendritic nanostructures,and the nanocluster arrays are composed of nanoneedles or tetragonal prism nanorods;with the increase of reaction temprature,the crystal morphology of manganese oxide was gradually improving,and was trasformed from nanoneedles to tetragonal prism nanorods;the capacitance of MnO2 electrode was a combined contribution of electrical double-layer capacitance and pseud-ocapacitance,and the best specific capacitance value of MnO2 electrode was 603 F/g corresponding to the charge/discharge current density of 5 mA/cm2;with the increase of reaction temperature ranging from 100-180℃,the specific capacitance of manganese oxide gradually decline.
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