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首页> 外文期刊>Electroanalysis >Electrochemical synthesis and characterization of 1,2-naphthaquinone-4-sulfonic acid doped polypyrrole
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Electrochemical synthesis and characterization of 1,2-naphthaquinone-4-sulfonic acid doped polypyrrole

机译：1,2-萘醌-4-磺酸掺杂的聚吡咯的电化学合成与表征

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摘要

Polypyrrole thin film microelectrodes prepared from an aqueous solution of the sodium salt of 1, 2-napthaquinone-4sulfonic acid and pyrrole in hydrochloric acid as the supporting electrolyte was characterized electrochemically for the first time and found to exhibit good electronic and spectroscopic properties. Voltammetric investigations showed that the polymer exhibited quasireversible kinetics in a potential window of -400 mV to 700 mV, with a formal potential of 322 mV vs. Ag/AgCl. The diffusion coefficient was calculated to be 1.02 x 10(-6) cm(2) s(-1) for a thin film with a surface concentration of 1.83 x 10(-7) mol cm(-2) having a rate constant of 2.20 x 10(-3) cm s(-1) at 5 mV s(-1). Electrochemical impedance spectroscopy provided quantitative information about the conductivity changes within the modified polymer and support for the quasireversible kinetics suggested by voltammetry. The changes in electrical properties of the polymer during electrochemical p-doping and n-doping were quantified by equivalent electrical circuit fitting and assisted in the identification of the suggested kinetic mechanism. SNIFTIRS confirmed the incorporation of the surfactant into the polypyrrole film and for the first time structural changes within the polymer were observed that could be related to the observed electrochemistry of the polymer.
机译：首次电化学表征了由1,2-萘醌4-磺酸的钠盐和吡咯在盐酸中的水溶液作为支撑电解质制备的聚吡咯薄膜微电极，并显示出良好的电子和光谱性质。伏安研究表明，该聚合物在-400 mV至700 mV的电势窗口中表现出准可逆动力学，相对于Ag / AgCl的形式电势为322 mV。对于表面速率为1.83 x 10（-7）mol cm（-2）的薄膜，扩散系数经计算为1.02 x 10（-6）cm（2）s（-1）。在5 mV s（-1）时为2.20 x 10（-3）cm s（-1）。电化学阻抗谱提供了有关改性聚合物内电导率变化的定量信息，并为伏安法建议的拟可逆动力学提供了支持。通过等效电路拟合对电化学p掺杂和n掺杂过程中聚合物电学性质的变化进行定量，并有助于确定建议的动力学机理。 SNIFTIRS确认将表面活性剂掺入到聚吡咯膜中，并首次观察到聚合物内部的结构变化，这可能与所观察到的聚合物的电化学反应有关。

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