α-MnO_2微球的制备及其电化学电容性质  

Preparation and Electrochemical Capacitance of α-MnO_2 Microspheres

作　　者：罗建民[1] 李娟[1] 张校刚[1] 高博[1] 

机构地区：[1]新疆大学应用化学研究所,乌鲁木齐830046

出　　处：《应用化学》2007年第8期949-952,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(20403014)

摘　　要：以Ag片作催化剂在室温下制备了具有较高比表面积(177m2/g)的电化学电容器材料MnO2。XRD测试和SEM分析表明,所制备的MnO2为纳米纤维组成的仙人球状微球结构的α-MnO2。交流阻抗、循环伏安、恒流充放电和循环寿命等电化学测试均表明,所合成的α-MnO2微球在1mol/LNa2SO4水溶液中具有良好的电化学电容性能,单电极比电容可达187.1F/g,经1000次循环后电极容量仍保持在90%以上。MnO2 with a high surface area of 177 m2/g as electrode for electrochemical capacitor was prepared with Ag foil as the catalyst at room temperature. The results of XRD and SEM showed that the MnO2 is α-MnO2 microspheres with cactus-like morphology composed of nanofibres. AC impedances, cyclic voltammetry and constant current charge-discharge tests indicated that α-MnO2 microspheres had an excellent electrochemical capacitance with the highest capacitance of 187. 1 F/g and retained 90% of the initial capacity over 1 000 cycles within the potential range of 0-0. 8 V versus SCE in 1 mol/L Na2SO4.

关 键 词：MNO2 微球 电化学电容性质 

分 类 号：O614[理学—无机化学]