粉末微电极方法研究DMcT/PAn的电化学性能

来源期刊：中南大学学报(自然科学版)2003年第6期

论文作者：邓凌峰 李新海 肖立新 张云河 何则强 侯桃丽

文章页码：628 - 632

关键词：聚苯胺; DMcT; PAn;电催化;粉末微电极;循环伏安;交流阻抗

Key words：polyaniline; DMcT; PAn; electrocatalysis; powder microelectrode; cyclic voltammetry; AC impedance

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1.90 V降至0.07 V,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4.0 V,vs Li/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.

Abstract: The electrochemical properties of DMcT, PAn, and DMcT/PAnwere 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 DMcTis 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 (123Ω) is less than that (948Ω) 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/Panvia powder microelectrodes can reflect accurately and truthfully the electrocatalytic effects of PAn on the reaction of DMcT.