关键词: 氧化, 膜电极, 电解质, 还原反应, 电子自旋共振, 导电性, 电荷转移, 聚合物膜, 聚吡咯, 极化因子

Electrodes coated with conducting polypyrrole film were studied in aqueous solns. by in-situ ESR-electrochem. measurements. It was qual. shown that the spin concentration is directly dependant on the oxidation state of polypyrrole. In transient processes, the formation of spins and their transformation to spinless structures were correlated with electrochem. charge injections. The experimental results are explained in terms of polaron and bipolaron formations in the electrochem. redox processes. ESR-electrochem. behaviors of the polymer-coated electrodes in solns. containing ascorbic acid were also investigated. The charge transfers in polypyrrole film might include contributions from both polarons and bipolarons.

Key words: OXIDATION, MEMBRANE ELECTRODES, ELECTROLYTE, REDUCTION REACTION, ELECTRON SPIN RESONANCE, ELECTRICAL CONDUCTIVITY, CHARGE TRANSFER, POLYMER FILMS, POLYPYRROLE, POLARIZATION FACTOR