聚苯胺衍生物膜修饰电极的电化学和催化性质  

Electrochemical and Electrocatalytic Properties of Polyaniline Derivatives Membrane Modified Electrode

作　　者：许一婷[1] 戴李宗[1] 何云游[1] Tahina Rakotoartsoa Jean-Yves Gal 吴辉煌[1] 

机构地区：[1]厦门大学化学化工学院,固体表面物理化学国家重点实验室 [2]UMR Laboratoire Hydrosciences(CNRS,UMI,IRD)Maison des Sciences de l'Eau de Montpellier,Université Montpellier Ⅱ,34095 Montpellier Cedex 05,France

出　　处：《物理化学学报》2003年第6期564-568,共5页Acta Physico-Chimica Sinica

基　　金：中国教育部博士点专项科研基金(1999038404);中-法先进研究计划(PRA-E-01-07);福建科技重点项目(2002I027);厦门市技术创新项目(3502Z20021049)资助~~

摘　　要：采用聚-2,5-二甲氧基苯胺(PDMAn)、聚邻甲苯胺(POT)膜修饰电极,以异丙醇(i-P)氧化为模型反应,研究功能性膜电极的电催化性能.两种聚合物的伏安行为都表现为两对氧化还原峰;与镀铂的Pt电极比较,Pt金属化的PDMAn和POT修饰电极,大大提高了i-P氧化电流密度,而且随着循环次数增加,氧化电流不断增大,表明功能性膜修饰电极具有较高的催化活性.POT修饰电极在较低的铂含量下就表现出对i-P的强烈催化活性,而且对低浓度i-P的氧化,具有较高的响应灵敏度;此外POT还具有良好的环境稳定性,可望成为一种具有实际应用前景的电化学传感器.In this work isopropanol(i-P) oxidation was adopted as a model reaction for studying the catalytic activity of poly-2, 5-dimethylaniline (PDMAn) and poly-o-toluidine (POT) membrane modified electrode. Each voltammetric curve of PDMAn and POT modified electrodes has two pair of redox peaks. In comparison with platinized Pt electrode, platinized PDMAn and POT modified electrodes enhance i-P oxidation current significantly, furthermore the oxidation current increase with potential cycling numbers, whereas the oxidation current at platinized Pt electrode decreases with potential cycling numbers. It is indicated that the functional membrane modified electrode exhibits higher catalytic activity to i-P oxidation. POT modified electrode with low platinum loading shows great catalytic activity for i-P oxidation, and has higher response sensitivity than PDMAn in the condition of low concentration i-P. It is also found that PDMAn has degraded after preservation in air for three years, while POT has excellent environmental stability. Therefore, POT is promising to be an electrochemical sensor material with practical application prospect.

关 键 词：聚苯胺衍生物膜 修饰电极 电化学 催化性质 聚-2 5-二甲氧基苯胺 PDMAn 聚邻甲苯胺 POT 异丙醇氧化 

分 类 号：O646[理学—物理化学]