Contribution of Surface Distributions to Constant-Phase-Element (CPE) Behavior: 2. Capacitance

Christopher L. Alexander (1) , Bernard Tribollet (2) , Mark E. Orazem (1)

1 UF|CHE - Department of Chemical Engineering [Gainesville]
2 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

Finite–element simulations were performed to determine the influence of a radial distribution of capacitance on the impedance of ideally polarized disk electrodes. The characteristic length associated with this form of distribution was found to be the period of the distribution. This work showed that while a capacitance distribution causes frequency dispersion, this effect is seen only at frequencies that are much higher than those associated with the disk-geometry-induced frequency dispersion. Thus, a constant-phase-element associated with a surface distribution of time constants cannot be attributed to a distribution of capacitance.

Mots clés: Frequency Dispersion; capacitance; impedance spectroscopy

Domaines: Chimie; Autre

Christopher L. Alexander, Bernard Tribollet, Mark E. Orazem. Contribution of Surface Distributions to Constant-Phase-Element (CPE) Behavior: 2. Capacitance. Electrochimica Acta, 2016, 188, pp.566-573. ⟨10.1016/j.electacta.2015.11.135⟩. ⟨hal-01255003⟩