低温固相法制备纳米二氧化锰及电化学性能

发布时间：2019-06-13 08:04

【摘要】：选取三种不同的二价锰盐分别与高锰酸钾低温固相反应,制备出不同的纳米二氧化锰电活性材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)与全自动高压物理吸附仪对材料表面的形貌与结构进行了表征,借助循环伏安、恒流充放电和交流阻抗技术测试材料的电化学性能。研究结果表明,二价锰源的阴离子对产物的微观结构和电化学性能均会产生一定影响。其中,由硫酸锰和氯化锰分别与高锰酸钾反应制备的无定形Mn O2电极材料比电容较高,而由乙酸锰和高锰酸钾反应制备出的γ-Mn O2电极材料具有良好的循环稳定性能,循环800次后,电容保持率可高达95%。
[Abstract]:Different electroactive materials of manganese dioxide were prepared by solid state reaction of three different divalent manganese salts with potassium permanganate at low temperature. The morphology and structure of the surface of the material were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM) and automatic high voltage physical adsorption instrument. The electrochemical properties of the material were measured by cyclic volt-ampere, constant current charge-discharge and AC impedance technique. The results show that the anions of divalent manganese source have some effects on the microstructure and electrochemical properties of the products. Among them, the amorphous Mn O _ 2 electrode material prepared by the reaction of manganese sulfate and manganese chloride with potassium permanganate has higher specific capacitance, while the 纬-Mn O _ 2 electrode material prepared by the reaction of manganese acetate and potassium permanganate has good cycle stability. After 800 cycles, the capacitance retention rate can be as high as 95%.
【作者单位】：新疆大学应用化学研究所;
【基金】：新疆自然科学基金资助项目(2011211A001)
【分类号】：TM53

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