MnO_2电沉积直立碳纳米管制备超级电容器  

Supercapacitors of Manganese Oxide-modified Aligned Carbon Nanotube Nanocomposite by Electrodeposition Method

作　　者：王艳芝[1] 庞飞燕[1] 杨静[1] 徐颖[1] 何品刚[1] 方禹之[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《应用化学》2009年第6期702-706,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20675031);上海市科技委员会(0552nm042);上海市浦江人才计划(06PJ14032)资助项目

摘　　要：以直立碳纳米管为基底,以pH=6.0的0.1 mol/L Na2SO4为底液,采用电化学沉积法在0.2 mol/LMn（CH3COO）2溶液中制备了直立碳纳米管与MnO2复合材料。SEM测试结果表明,复合材料表面呈现多孔状结构。通过循环伏安、恒流充放电、交流阻抗等电化学方法对复合材料修饰电极进行电容性质测试。结果表明,在1 mol/L KCl溶液中,0-0.6 V（vs.Ag/AgCl参比）电位窗口内此复合材料表现出优良的超电容性能。直立碳纳米管电极的比电容为16 F/g,在碳纳米管表面沉积上MnO2修饰层后,复合材料电极的比电容增大至330 F/g,比电容量大幅提升近20倍。同时扫描200圈后,直立碳纳米管与MnO2复合材料的循环伏安曲线变化很小,具有相当好的循环寿命和电容稳定性能。MnO2 thin film was electrodeposited onto aligned carbon nanotubes （ACNTs） electrode in the electrolyte containing 0.2 mol/L Mn（CH3COO） 2 and 0. 1 mol/L Na2SO4 at pH =6. 0. As observed by means of scanning electron microscopy, the resulting MnO2 film on those nanotubes exhibited hole-like microstructure. Such-prepared MnO2-modified ACNTs nanocomposite was then characterized by cyclic vohammograms, charge-discharge curve and electrochemical impedance measurements etc. , and it showed excellent capacitive behavior between 0 -0.6 V（vs. Ag/AgCl） in 1 moL/L KCl aqueous solution. The specific capacitance of the ACNT electrode was calculated to be 16 F/g before the MnO2 film modification, and increased to 330 F/g after the MnO2 film deposition due to the special Faradic capacitance of MnO2. After scaning for 200 cycles, there was a little change for its cyclic voltammogram curve, indicating good reversible and capacitive property of the MnO2-ACNTs composite.

关 键 词：直立碳纳米管 超级电容器 MNO2 

分 类 号：O646[理学—物理化学]