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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

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Abstract

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 0.5 M Fe3+/Fe2+ in 1 M 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.

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Acknowledgements

The authors acknowledge the Fonds National Suisse de la Recherche Scientifique for the financial support and Mr. Johnny Nussbaumer for his contribution in the experimental measurements.

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Authors and Affiliations

  1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015, Lausanne, Switzerland

    Erika Herrera Calderon, György Fóti & Christos Comninellis

  2. Department of Mechanical and Industrial Engineering, Concordia University, 1455 de Maisonneuve Blvd. West, Montreal, Quebec, H3G 1M8, Canada

    Rolf Wüthrich

  3. ENSCP, Laboratoire d’Electrochimie et de Chimie Analytique, UMR CNRS 7575, 11 rue Pierre et Marie Curie, 75231, Paris Cedex 05, France

    Philippe Mandin

Authors
  1. Erika Herrera Calderon
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  2. Rolf Wüthrich
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  3. Philippe Mandin
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  4. György Fóti
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  5. Christos Comninellis
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Corresponding authors

Correspondence to Rolf Wüthrich or György Fóti.

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Calderon, E.H., Wüthrich, R., Mandin, P. et al. Estimation of the effectiveness factor of an outer-sphere redox couple (Fe3+/Fe2+) using rotating disk Ti/IrO2 electrodes of different loading. J Appl Electrochem 39, 1379–1384 (2009). https://doi.org/10.1007/s10800-009-9813-6

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  • DOI: https://doi.org/10.1007/s10800-009-9813-6

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