纳米MnO_2的制备及其电化学性能研究  

Preparation and Electrochemical Performance of Nanostructured MnO_2 Materials

作　　者：吴雯[1] 周丹丹[1] 侯孟炎[1] 夏永姚[1] 

机构地区：[1]复旦大学分子催化与功能材料上海市重点实验室,化学系,新能源研究院,上海200433

出　　处：《电化学》2012年第4期295-300,共6页Journal of Electrochemistry

基　　金：国家杰出青年科学基金项目(No.20925312);纳米重大科学研究计划(No.2011CB935904)资助

摘　　要：加入不同浓度的十二烷基磺酸钠表面活性剂(SDS)改变微乳液溶液介质,用苯胺还原高锰酸钾,制备了不同颗粒大小的纳米片状MnO2材料.采用X射线粉末衍射、氮吸附比表面测试和扫描电镜及透射电镜表征观察合成材料.电化学测试表明,0.20 mol·L-1SDS所合成的纳米MnO2比表面约为228.2 m2·g-1,在1mol·L-1Li2SO4电解液中,该电极比电容达到237 F·g-1(0.1 A·g-1),350℃煅烧MnO2电极还可发生可逆Li+嵌脱反应增加其比电容.Nanostructured MnO2 materials were prepared in a micro-emulsion medium using sodium dodecyl sulfate （SDS）as surfactant by a redox reaction between potassium permanganate and aniline. The morpholo- gies of the obtained MnOz were critically dependent on the concentrations of SDS. The particle size varied with the change in the micro-emulsion medium. The optimized properties of MnO2 material obtained with the surfactant concentration of 0.2mol·L^-1 had a specific surface area of 228.2 m^2·g^-1, and delivered a specific capacitance of 237F·g^-1 in 1mol·L^-1 Li2SO4. Additionally, a reversible Li-ion intercalation reaction oc-curred in the MnO2 calcined at 350 ℃.

关 键 词：微乳液法 赝电容 纳米MNO2 嵌入反应 超电容器 

分 类 号：TM53[电气工程—电器]