水介质中吡咯的电化学聚合反应

研究了扫描电位上限对循环伏安法制备聚吡咯膜性能的影响，吡咯在水溶液中于玻碳电极表面化学聚合的起始电位为0．58V，在聚吡咯（Ppy）修饰电极表面聚合的起始电位为0．55V，当聚合电位上限在0．80V以上时，Ppy的氧化还原反应可逆性变差，同时，氧化电位过高将导致Ppy膜导电性能下降；研究了聚合介质对循环伏安法制备导电聚吡咯膜的影响，实时观察了吡咯（Py）聚合过程溶液中质子含量的动态变化，发现Py聚合伴随有质掺杂←→释放过程；结合Ppy膜的元素分析、ESR分析和IR光谱分析，总结出了水介质中电化学聚合高导电性聚吡咯膜的条件。

Electrochemical Polymerization of Pyrrole in Aqueous Solutions

The effect of upper limit of scanning potential on electrochemical properties of polypyrrole films prepared by cyclic voltammetry has been studied in details. The initiation potential for electrochemical polymerization of pyrrole in aqueous media was 0.58 V on the surface of a glassy carbon electrode, and 0.55 V on a polypyrrole- modified electrode. The upper limit of pyrrole polymerization potential was found to be in the range of 0.58-0.80 V (vs SCE). At a potential higher than 0.80 V, the reversibility of redox reaction of pyrrole becomes worse. With too high a potential, the conductivity of polypyrrole films will be reduced too. Dynamic changes in proton concentration observed during polymerization revealed, that pyrrole polymerization is accompanied by proton doping and releasing. Elemental analysis, IR and ESR studies provide the polymerization conditions for preparing high- conductivity polypyrrole films.