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 ℃.
出处
《电化学》
CAS
CSCD
北大核心
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
关键词
微乳液法
赝电容
纳米MNO2
嵌入反应
超电容器
micro-emulsion method
pseudo-capacitance
nanostructured MnO2
intercalation reaction
su-percapacitor
