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Influence of normal and radial contributions of local current density on local electrochemical impedance spectroscopy.

Ferrari, J.V. and De Melo, Hercílio Gomes and Keddam, M. and Orazem, Mark E. and Pébère, Nadine and Tribollet, Bernard and Vivier, Vincent Influence of normal and radial contributions of local current density on local electrochemical impedance spectroscopy. (2012) Electrochimica Acta, vol. 60 . pp. 244-252. ISSN 0013-4686

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Official URL: http://dx.doi/10.1016/j.electacta.2011.11.053

Abstract

A new tri-electrode probe is presented and applied to local electrochemical impedance spectroscopy (LEIS) measurements. As opposed to two-probe systems, the three-probe one allows measurement not only of normal, but also of radial contributions of local current densities to the local impedance values. The results concerning the cases of the blocking electrode and the electrode with faradaic reaction are discussed from the theoretical point of view for a disk electrode. Numerical simulations and experimental results are compared for the case of the ferri/ferrocyanide electrode reaction at the Pt working electrode disk. At the centre of the disk, the impedance taking into account both normal and radial contributions was in good agreement with the local impedance measured in terms of only the normal contribution. At the periphery of the electrode, the impedance taking into account both normal and radial contributions differed significantly from the local impedance measured in terms of only the normal contribution. The radial impedance results at the periphery of the electrode are in good agreement with the usual explanation that the associated larger current density is attributed to the geometry of the electrode, which exhibits a greater accessibility at the electrode edge.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://www.sciencedirect.com.chimie.gate.inist.fr/science/article/pii/S0013468611017269
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > University of Florida (USA)
Other partners > Universidade de São Paulo - USP (BRAZIL)
Laboratory name:
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Deposited By: Denis Faragou

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