THE INFLUENCE OF THE ELECTROLYTE NATURE ON THE ELECTROCHEMICAL-BEHAVIOR OF POLYPYRROLE FILMS DOPED WITH THE FECL4- ANION

Polypyrrole films containing tetrachloroferrate anions are prepared on a platinum electrode in the potential cycling mode and the galvanosta tic mode. Cyclic voltammetry, ESR, and elemental analysis are employed for studying the films. Their conductivity is measured. Crater-like f ormations are observed in the electron micrographs of the film surface s. The cyclic voltammograms of the films are found to be stable during cycling in acetonitrile solutions of tetraethylammonium tetrachlorofe rrate (TEATCF) and tetraethylammonium perchlorate (TEAP) and unstable in a sodium perchlorate solution. The cycling interval -1.0 to 1.0 V b eing expanded to -1.5 to 1.5 V (with respect to the silver-silver-chlo ride reference electrode), redox-capacity of the films increases three fold in TEATCF solutions; polypyrrole in these solutions does not degr ade, in contrast to TEAP solutions.