MnO2的机械化学法制备及其性能

Mechanochemical preparation and characterization of manganese dioxide

    摘要
  • 摘要: 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,0～1V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1～0.67V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。

     

    Abstract: MnO2 was prepared by mechanochemical method,the influence of mole ratio KMnO4: Mn（CH3COO）2 on the performance of MnO2 was studied.The structure and morphology were investigated by XRD、SEM、IR and BET.The charge/discharge capability of supercapacitor assembled were investigated in 6 mol/L KOH.The results showed that the more Mn（CH3COO）2 contained in raw materials,the better the crystallite formed;the size of products was in the grade of micro-meter,but the discharge capacitance was decreased.From 504 F/g to 388 F/g.When the mole ratios of KMnO4: Mn（CH3COO）2 were 2:2 and 2:3,the product had better capability.The maximum of discharge capacitance was as high as 504 F/g and 516F/g respectively,within 0~1 V,200 mA/g.

     

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