高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (10): 1915.

• 论文 • 上一篇    下一篇

功能化聚(2,5-二甲氧基苯胺)膜的电化学和电催化性质研究

许一婷1, 何云游1, 戴李宗1, Rakotoartsoa Tahina2, Gal Jean-Yves2, 吴辉煌1   

  1. 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, 厦门 361005;
    2. 法国国家科学研究中心水科学研究所, 蒙彼利埃Ⅱ大学, 蒙彼利埃 34095
  • 收稿日期:2002-10-10 出版日期:2003-10-24 发布日期:2003-10-24
  • 通讯作者: 戴李宗(1959年出生),男,博士,教授,博士生导师.主要从事高分子化学与物理研究.E-mail:lzdai@xmu.edu.cn E-mail:lzdai@xmu.edu.cn
  • 基金资助:

    教育部博士学科点专项科研基金(批准号:1999038404);中-法先进研究计划项目(PRA;E-01-07);福建省科技重点项目(批准号:2002I027);厦门市技术创新项目(批准号:3502Z20021049)资助

Studies on Electrochemical and Electrocatalytic Properties of Functional Poly-2,5-dimethoxyaniline Membrane

XU Yi-Ting1, HE Yun-You1, DAI Li-Zong1, Rakotoartsoa Tahina2, Gal Jean-Yves2, WU Hui-Huang1   

  1. 1. Chemistry and Chemical Engineering College, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China;
    2. UMR Laboratoire Hydrosciences, Maison des Sciences del'Eau de Montpellier, Université Montpellier Ⅱ, Cedex 05 Montpellier 34095, France
  • Received:2002-10-10 Online:2003-10-24 Published:2003-10-24

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被引次数

6

摘要： 聚(2,5-二甲氧基苯胺)含有对称的环取代基,其电化学活性可与PAni相比拟.该聚合物具有三种氧化态,即完全还原态(L)、半氧化态(E)和完全氧化态(P),在伏安曲线上分别于0.19和0.51V处出现L/E和E/P转变峰.掺杂态聚合物和本征态聚合物的氧化还原分别经历LEHP和LHEHP路径,其中E/P转变峰电位随pH升高而发生负移.铂化的聚合物电极对异丙醇的氧化具有明显的催化作用,且随着扫描时间延长,氧化电流逐渐提高;聚合物与铂微粒相互作用,改变铂微粒的几何结构和电子性质,使催化体系具有良好的催化活性和抗中毒能力.在pH=4.7的缓冲溶液中,该修饰电极对异丙醇氧化仍具有催化活性.聚合物在空气中存放太久(3年)会发生降解,从而影响其电化学性质.

关键词: 聚(2, 5-二甲氧基苯胺), 氧化还原行为, 异丙醇催化氧化, 稳定性

Abstract: Electrochemical activity of poly-2,5-dimethoxyaniline(PDMAn) is similar to parent polyaniline because of two symmetric substituted groups.Three oxidation states of PDM An can transform reversibly, known as the completely reduced leucoemeraldine(L), intermediate emeraldine(E) and the fully oxidized pernigraniline(P).In voltammograms, the L/E, E/P transformation peaks are located at 0.19 and 0.51V, respectively.Doping polymer and intrinsic polymer follow the redox transformation as LEHP and LHEHP separately.And E/P transformation peak shifts to lower potential by increasing pHvalue.In de-aerated solution the platinized polymer has an evidently catalytic activity on isopropanol oxidation.Furthermore the oxidative current enhances with increasing potential cycling numbers, whereas it decreases for platinized Pt electrode.The Pt particles not only highly disperse in PDMAn membrane, but also interact with PDMAn, resulting in changing their geometric structure and the electron properties of that metal.It is illustrated that as a catalytic system with a high catalytic and anti-poisoning activity, platinized PDMAn membrane electrode will also catalyze isopropanol oxidation in pH=4.7 buffer solution.It is pointed that PDMAn will degrade after preservation in air for three years.

Key words: Poly-2,5-dimethoxylaniline, Redox behavior, Isopropanol catalytic oxidation, Stability

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