Abstract
Anodic polymerization of pyrrole, 3‐methylthiophene, and aniline at Nafion‐coated electrodes gives conducting polymer‐Nafion composite films. The composite films show better reversibility in the film redox process than conducting polymer films alone, owing to different charge compensation mechanisms in the redox reaction; electrolyte cations are involved in the redox process of the composite films, whereas electrolyte anions are in the ordinary conducting polymers. The fast kinetics of the redox process of the composite films are effectively demonstrated by an improvement of the polypyrrole electrochromic response and by the efficient utilization of stored charge by the composite film electrodes.