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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| Authors: | Erika Herrera Calderon Rolf Wüthrich Philippe Mandin Gy?rgy Fóti Christos Comninellis |
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| Affiliation: | (1) Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, CH-1015 Lausanne, Switzerland;(2) Department of Mechanical and Industrial Engineering, Concordia University, 1455 de Maisonneuve Blvd. West, Montreal, Quebec, H3G 1M8, Canada;(3) ENSCP, Laboratoire d’Electrochimie et de Chimie Analytique, UMR CNRS 7575, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France |
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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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| Keywords: | Ti/IrO2 electrodes Rotating disk electrode (RDE) technique Fe3+/Fe2+ redox couple Effectiveness factor |
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