纳米TiO_2掺杂活性炭极化电极的电化学特性研究  

The electrochemical characteristics of activated carbon modified by nano-TiO_2 as the supercapacitor electrode

作　　者：梁海潮[1] 陈方[1] 李仁贵[1] 王璐[1] 邓正华[1] 

机构地区：[1]中国科学院成都有机化学研究所,四川成都610041

出　　处：《电源技术》2005年第1期24-26,共3页Chinese Journal of Power Sources

摘　　要：文章研究了纳米TiO2掺杂活性炭(AC)复合物ACT(纳米TiO2掺杂活性炭的AC电极样品)作为超级电容器电极的电化学特性.实验结果表明,对于具有n型半导体特性的TiO2掺杂AC,作为超级电容器正极材料时能够显著提高AC的储能能力,作为负极时却大大地降低了AC的储能能力.在超级电容器ACT电极中AC:TiO2为6:1时,其电极的比容量达到69.4 F·g-1,比纯AC电极的容量提高了约47%.循环伏安扫描图表明该ACT电极的电化学行为依然为典型的双电层电容特性.掺杂前在350～750℃温度范围对纳米TiO2进行处理有利于进一步提高ACT电极的储能容量.In this paper, electrochemical characteristics of supercapacitors based on the composites of activated carbon(AC) modified with nano-TiO2 were investigated. For the composites materials, when acted as the positive electrode the storage capacitance of AC obviously improved, but as the negative electrode the storage capacitance of AC greatly decreased. When the ratio of AC:TiO2=6:1, the capacitance of capacitor AC/ACT increased to 69.4 F·g-1, about 47% larger than the pure AC-based capacitor. The cyclic voltammograms show there is a typical double-layer characteristic at the capacitor behavior, a pure electrostatic attraction appearing in these capacitors, the same as the AC-supercapacitor. Before the modification of AC, heat treatment of nano-TiO2 helps to improve the capacitance of AC and the optimal treating temperature is 350-750 ℃.

关 键 词：超级电容器 纳米TIO2 活性炭 双电层 

分 类 号：TM53[电气工程—电器]