Modelling the impedance properties of electrodes coated with electroactive polymer films

M. A. Vorotyntsev, L. I. Daikhin, M. D. Levi

Research output: Contribution to journalArticlepeer-review

208 Scopus citations


The response of a metal/electroactive polymer film/solution system to a low-amplitude variation of electrode polarization is analysed, taking account of both the electrodiffusion transport of electronic and ionic species in the bulk film and non-equilibrium heterogeneous charge transfer, namely electrons at the metal-film boundary and ions at the film-solution boundary. Exact analytical solutions are obtained for concentration and electric field profiles inside the film, interfacial potential drops, and complex impedance. Their dependence on frequency and the ratio of diffusion coefficients, De and Di, are analysed. For unequal values, De ≠ Di, the electric field inside the film is shown to be non-uniform and the instantaneous concentration profile is non-symmetrical with respect to the middle-plane of the film. The impedance of the system contains (in addition to the interfacial charging and solution contributions) a frequency-independent resistivity due to ohmic potential drops in the bulk film and at both interfaces as well as distributed capacitive and resistive elements.

Original languageEnglish
Pages (from-to)37-49
Number of pages13
JournalJournal of Electroanalytical Chemistry
Issue number1-2
StatePublished - 31 Jan 1994
Externally publishedYes


Dive into the research topics of 'Modelling the impedance properties of electrodes coated with electroactive polymer films'. Together they form a unique fingerprint.

Cite this