粉末微电极方法研究DMcT/PAn的电化学性能  

Electrochemical properties of DMcT/ PAn with powder microelectrodes

作　　者：邓凌峰[1] 李新海[1] 肖立新[1] 张云河[1] 何则强[1] 侯桃丽[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南工业大学学报》2003年第6期628-632,共5页Journal of Central South University of Technology(Natural Science)

基　　金：国家教育部留学回国人员科研启动基金资助项目([2002]247)

摘　　要：用粉末微电极方法研究DMcT,PAn及DMcT/PAn的电化学性能.在有PAn存在时,DMcT的氧化还原峰电位差由1.90V降至0.07V,表明DMcT的电化学氧化还原反应速度加快.DMcT/PAn的电化学阻抗(123Ω)比DMcT的电化学阻抗(948Ω)小得多,说明PAn对DMcT的电化学氧化还原反应具有电催化作用.同时,DMcT使PAn在较高的电压时(大于4.0V,vsLi/Li+)能保持电化学活性,而且经过100次循环后,循环伏安(CV)曲线几乎没有变化,表明DMcT/PAn具有优良的循环稳定性和可逆性.比较粉末微电极的CV曲线和常规尺寸电极的CV曲线,粉末微电极能真实地反映PAn和DMcT复合时的氧化还原反应特性.The electrochemical properties of DMcT, PAn, and DMcT/PAn were investigated via powder microelectrodes. The results show that the redox peak-potential of DMcT/PAn ( 0.07 V ) is less than that (1.9 V ) of DMcT, which indicates the redox reaction of DMcT is accelerated greatly by PAn. PAn shows also a great electrochemical catalysis on the reaction of DMcT from the fact that charge-transfer resistance of DMcT/PAn (123 Ω) is less than that (948 Ω) of DMcT. In the meantime, DMcT can maintain the electrochemical activity of PAn at voltage above 4.0 V (vs Li/Li^+), and its cyclic voltammogram is almost unchanged after 100 circles, indicating that DMcT/PAn possesses excellent cycle stability and reversibility. Compared with the cyclic voltammogram of DMcT/PAn via conventional electrodes, DMcT/PAn via powder microelectrodes can reflect accurately and truthfully the electrocatalytic effects of PAn on the reaction of DMcT.

关 键 词：聚苯胺 DMcT PAN 电催化 粉末微电极 循环伏安 交流阻抗 

分 类 号：O657[理学—分析化学]