Impedance analysis of polymer film electrodes

G. Láng, J. Bácskai, G. Inzelt

Research output: Article

48 Citations (Scopus)

Abstract

A new model is elaborated which can explain some anomalies of the impedance spectra of polymer films on electrodes. The model assumes two capacitances associated with the double layers at the substrate/film and at the film/solution interfaces, respectively. The latter capacitance is considered as a constant phase element due to the inhomogeneity of the polymer network and to energetically non-equivalent bonding sites for counterions. The effect of a low dc current, ie a slow reaction of the redox sites in the film with solution species, is also investigated. The electrochemical impedances characteristic of the model have been derived. The simulated impedance spectra were compared with those obtained experimentally.

Original languageEnglish
Pages (from-to)773-780
Number of pages8
JournalElectrochimica Acta
Volume38
Issue number6
DOIs
Publication statusPublished - ápr. 1993

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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