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首页> 外文期刊>Advanced Functional Materials >Structural Electrochemistry from Freestanding Polypyrrole Films: Full Hydrogen Inhibition from Aqueous Solutions
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Structural Electrochemistry from Freestanding Polypyrrole Films: Full Hydrogen Inhibition from Aqueous Solutions

机译：独立的聚吡咯膜的结构电化学：水溶液中的全氢抑制

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摘要

Free-standing polypyrrole films, being the metal-polymer contact located several millimeters outside the electrolyte, give stationary closed coulo-voltammetric (charge/potential) loop responses to consecutive potential sweeps from -2.50 V to 0.65 V in aqueous solutions. The continuous and closed charge evolution corroborates the presence of reversible film reactions (electroactivity), together high electronic and ionic conductivities in the full potential range. The closed charge loop demonstrates that the irreversible hydrogen evolution is fully inhibited from aqueous solutions of different salts up to -2.5 V vs Ag/AgCl. The morphology of the closed charge loops shows abrupt slope changes corresponding to the four basic components of the structural electrochemistry for a 3D electroactive gel: reduction-shrinking, reduction-compaction, oxidation-relaxation, and oxidation-swelling. Freestanding films of conducting polymers behave as 3D gel electrodes (reactors) at the chain level, where reversible electrochemical reactions drive structural conformational and macroscopic (volume variation) changes. Very slow hydrogen evolution is revealed by coulovoltammetric responses at more cathodic potentials than -1.1 V from strong acid solutions, or in neutral salts self-supported blend films of polypyrrole with large organic acids. Conducting polymers overcome graphite, mercury, lead, diamond, or carbon electrodes as hydrogen inhibitors, and can compete with them for some electro-analytical and electrochemical applications in aqueous solutions.
机译：独立的聚吡咯膜是位于电解质外数毫米处的金属-聚合物触点，可对水溶液中从-2.50 V至0.65 V的连续电位扫描提供稳定的闭合库洛伏安（电荷/电位）环路响应。连续和封闭电荷的释放证实了可逆膜反应（电活性）的存在，以及在整个电势范围内的高电子和离子电导率。封闭的电荷回路表明，相对于Ag / AgCl，高达-2.5 V的不同盐的水溶液完全抑制了不可逆的氢释放。闭合电荷环的形态显示出与3D电活性凝胶的结构电化学的四个基本组成部分相对应的陡峭斜率变化：还原收缩，还原紧密，氧化松弛和氧化膨胀。导电聚合物的独立膜在链水平上充当3D凝胶电极（反应器），可逆的电化学反应驱动结构的构象和宏观（体积变化）变化。在强酸溶液中，阴极电位高于-1.1 V，或者在中性盐自支撑的聚吡咯与大有机酸的共混膜中，通过体积伏安法反应揭示了非常缓慢的氢释放。导电聚合物克服了作为氢抑制剂的石墨，汞，铅，金刚石或碳电极，并且可以与它们竞争在水溶液中的某些电分析和电化学应用。

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  • 来源
    《Advanced Functional Materials》 |2014年第9期|1265-1274|共10页
  • 作者

    Toribio F. Otero; Jose C. Martinez; Masaki Fuchiwaki; Laura Valero;

  • 作者单位

    Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politecnica de Cartagena Aulario II, Paseo Alfonso XIII, E-30203 Cartagena (Murcia), Spain;

    Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politecnica de Cartagena Aulario II, Paseo Alfonso XIII, E-30203 Cartagena (Murcia), Spain;

    Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politecnica de Cartagena Aulario II, Paseo Alfonso XIII, E-30203 Cartagena (Murcia), Spain,Kyushu Institute of Technology Department of Mechanical Information Science and Technology, 680-4 Kawazu lizuka (Fukuoka), 820-8502, Japan;

    Centre for Electrochemistry and Intelligent Materials (CEMI) Universidad Politecnica de Cartagena Aulario II, Paseo Alfonso XIII, E-30203 Cartagena (Murcia), Spain,Electronics department Engineering school Universidad Autonoma del Estado de Mexico Toluca, E-50130, Mexico;

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