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关于导电聚吡咯(PP)膜的导电机理,文献上提出的“极化子-双极化子”模型引起了电化学学者的兴趣,该模型认为PP在一定条件下可产生带一个正电荷的极化子(S=1/2)和带两个正电荷的双极化子(S=0)。Scott等人通过ESR研究认为导电PP中担负电荷传输的主要带电物种是双极化子。Genoud等人侧用电化学现场的ESR方法研究PP膜电极在有机溶液中的电化学过程,揭示自旋与电荷载流子之间存在相互关联,认为极化子在导电机理中的作用仍需进一步研究。本文报道PP膜电极在水溶液中的电化学-ESR行为,定性地探讨了电位、电量对PP膜中极化子形成与转化过程的影响,并在PP膜/溶液界面存在电化学反应的情形下,考察了PP膜中可能的电荷传输机理。
With regard to the conductive mechanism of conductive polypyrrole (PP) films, the “polaron-bipolaron” model proposed in the literature has attracted the interest of electrochemists. The model assumes that PP can produce a positive charge with a positive charge under certain conditions Polaron (S = 1/2) and bipolaron with two positive charges (S = 0). According to Scott et al.’s ESR study, the dominant charged species responsible for charge transport in conductive PP is bipolaron. Genoud et al. Studied the electrochemical process of PP membrane electrode in organic solution by ESR method at electrochemical site and revealed the interrelationship between spin and charge carriers. It is considered that the role of polaron in the conduction mechanism still needs further research. The electrochemical-ESR behavior of PP membrane electrode in aqueous solution was reported in this paper. The effect of potential and charge on the formation and conversion of polaron in PP membrane was qualitatively investigated. In the presence of electrochemical reaction at PP membrane / solution interface , Investigated the possible charge transport mechanism in PP film.