An advanced model of the impedance of polymer film electrodes

A new model for the impedance of polymer film electrodes has been developed in that three mobile charge carriers are considered. It has been observed especially in the case of organic conductive polymer that beside the electr on diffusion and counterion transport very often hydrogen ions also partici pate in the charge transport and charge transfer processes in the course of redox transformation of these polymers, i.e. a model describing this case is essential. It has been demonstrated that by the help of reasonable assumptions some of the mathematical problems can be overcome and an analytical solution can b e obtained for the complex impedance in the case of low amplitude Variation of the electrode polarization. The equations derived for the charge transport and charge transfer impedanc es are tested by CNLS fitting data obtained for an Au\poly(o-phenylenediami ne) electrode. (C) 1999 Elsevier Science Ltd. All rights reserved.