The problem of the low-frequency dispersion in the case of polymer film electrodes - An experimental impedance study on Au|poly (o-phenylenediamine) electrodes

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Abstract

Electrochemical impedance spectra are presented for Au|poly (o-phenylenediamine) electrodes in contact with 1 mol dm-3 perchloric acid solution. The roughness of the gold substrate and the film thickness, respectively, were systematically varied. The results obtained affirm that the dispersion of the low-frequency capacitance is connected with the inhomogeneity of the surface film, and the role of the surface roughness of the gold substrate is minor, if any, in the development of the CPE behaviour, which is in contrast to some hypotheses presented recently. (C) 2000 Elsevier Science S.A.

Original languageEnglish
Pages (from-to)497-502
Number of pages6
JournalElectrochemistry Communications
Volume2
Issue number7
DOIs
Publication statusPublished - Oct 3 2000

Keywords

  • Constant phase element (CPE)
  • Electrochemical impedance spectroscopy
  • Inhomogeneity
  • Polymer film electrodes
  • Roughness

ASJC Scopus subject areas

  • Electrochemistry

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