The Apparent Constant-Phase-Element Behavior of an Ideally Polarized Blocking Electrode

Vicky Mei-Wen Huang 1 Vincent Vivier 2 Mark E. Orazem 1 Nadine Pébère 3 Bernard Tribollet 2
1 University of Florida [Gainesville]
2 LISE - Laboratoire Interfaces et Systèmes Electrochimiques
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
Abstract : Two numerical methods were used to calculate the influence of geometry-induced current and potential distributions on the impedance response of an ideally polarized disk electrode. A coherent notation is proposed for local and global impedance which accounts for global, local, local interfacial, and both global and local ohmic impedances. The local and ohmic impedances are shown to provide insight into the frequency dispersion associated with the geometry of disk electrodes. The high-frequency global impedance response has the appearance of a constant-phase element CPE but can be considered to be only an apparent CPE because the CPE exponent is a function of frequency.
Keywords : electrochemical electrodes electric impedance electrochemistry ab initio calculations Laplace equations
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Vicky Mei-Wen Huang, Vincent Vivier, Mark E. Orazem, Nadine Pébère, Bernard Tribollet. The Apparent Constant-Phase-Element Behavior of an Ideally Polarized Blocking Electrode. Journal of The Electrochemical Society, Electrochemical Society, 2007, vol. 154, pp.C81-C88. ⟨10.1149/1.2398882⟩. ⟨hal-00806026⟩

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