Local electrochemical impedance spectroscopy: Considerations about the cell geometry |
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Authors: | Isabelle Frateur,Vicky Mei-Wen Huang,Nadine Pé bè re,Bernard Tribollet,Vincent Vivier |
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Affiliation: | a LPCS, CNRS - ENSCP (UMR 7045), Ecole Nationale Supérieure de Chimie de Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France b Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA c CIRIMAT, UMR 5085 du CNRS, ENSIACET, 118 route de Narbonne, 31077 Toulouse Cedex 04, France d LISE, UPR 15 du CNRS, Université P. et M. Curie, CP 133, 4 Place Jussieu, 75252 Paris Cedex 05, France |
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Abstract: | Local electrochemical impedance spectroscopy provides a powerful tool for the investigation of surface heterogeneities on electrode surfaces. However, measurements are greatly influenced by geometry-induced frequency dispersion. In order to account for this frequency dispersion, both simulations and experiments were performed to explore the influence of a recessed electrode on the local and global impedance response. The calculations presented here demonstrated that the depth of the recessed electrode required to achieve a uniform primary current distribution was twice the electrode radius. The calculations provide guidelines for design of LEIS measurements, and were in good agreement with results obtained for a stainless steel disk electrode in a Na2SO4 electrolyte. |
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Keywords: | Local electrochemical impedance spectroscopy (LEIS) Uniform primary current distribution Ideally polarized electrode Recessed electrode |
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