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Estimation of the effectiveness factor of an outer-sphere redox couple (Fe3+/Fe2+) using rotating disk Ti/IrO2 electrodes of different loading

Calderon, Erika ; Wüthrich, Rolf ; Mandin, Philippe ; Fóti, György ; Comninellis, Christos

In: Journal of Applied Electrochemistry, 2009, vol. 39, no. 8, p. 1379-1384

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    Titre
    • Estimation of the effectiveness factor of an outer-sphere redox couple (Fe3+/Fe2+) using rotating disk Ti/IrO2 electrodes of different loading
    Auteur
    • Calderon, Erika. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015, Lausanne, Switzerland
    • Wüthrich, Rolf. Department of Mechanical and Industrial Engineering, Concordia University, 1455 de Maisonneuve Blvd. West, H3G 1M8, Montreal, Quebec, Canada
    • Mandin, Philippe. ENSCP, Laboratoire d'Electrochimie et de Chimie Analytique, UMR CNRS 7575, 11 rue Pierre et Marie Curie, 75231, Paris Cedex 05, France
    • Fóti, György. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015, Lausanne, Switzerland
    • Comninellis, Christos. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Applied Electrochemistry, 2009, vol. 39, no. 8, p. 1379-1384. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319582
    Summary
    The effectiveness factor; E f , defined as the fraction of the surface that participates effectively in a given reaction, is an important parameter when operating three-dimensional (3D) electrodes. The rotating disk electrode (RDE) technique with the Fe3+/Fe2+ redox couple as a probe reaction has been used for the evaluation of the effectiveness factor of 3D Ti/IrO2 electrodes with different IrO2 loading. For this purpose, steady-state polarization measurements using Ti/IrO2 rotating disk electrodes in 0.5M Fe3+/Fe2+ in 1M HCl were carried out under well-defined hydrodynamic conditions. The low-field approximation relation has been used for the estimation of the exchange current densities j 0, of the Fe3+/Fe2+ redox couple. It was found for this redox couple that the effectiveness factor is very low (<2%) and essentially the 2D electrode surface area works effectively in the steady-state polarization measurements