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Oxygen reduction on silver catalysts in solutions containing various concentrations of sodium hydroxide – comparison with platinum

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Abstract

In air cathodes for chlorine–sodium hydroxide production, silver is a suitable catalyst for the oxygen reduction reaction (ORR), as is platinum. The ORR mechanism, studied with both rotating disc and ring-disc electrodes and impedance spectroscopy, is first order towards O2. However, the reaction can involve a direct four-electron or two-electron pathway. Although the latter involves different chemistry, including decomposition of hydrogen peroxide, the two pathways are difficult to distinguish, probably because they have the same rate-determining step. Considering kinetics/solubility ratios, temperature increase favours the ORR kinetics on both metals, whereas an increase in sodium hydroxide concentration is only positive for silver: for high sodium hydroxide concentration, platinum properties are hindered by greater adsorbed oxygenated species coverage. Thus, silver becomes competitive to platinum in high concentration alkaline media.

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Authors and Affiliations

  1. Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI, UMR 5631 CNRS-INP Grenoble associated to the UJF), ENSEEG, BP 75, 38402, Saint Martin d'Hères Cedex, France

    M. Chatenet, L. Genies-Bultel, M. Aurousseau & R. Durand

  2. Centre de Recherches Rhône-Alpes, ATOFINA, BP 63, rue H. Moissan, 69493, Pierre-Bénite Cedex, France

    F. Andolfatto

Authors
  1. M. Chatenet
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  2. L. Genies-Bultel
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  3. M. Aurousseau
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  4. R. Durand
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  5. F. Andolfatto
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Correspondence to M. Chatenet.

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Chatenet, M., Genies-Bultel, L., Aurousseau, M. et al. Oxygen reduction on silver catalysts in solutions containing various concentrations of sodium hydroxide – comparison with platinum. Journal of Applied Electrochemistry 32, 1131–1140 (2002). https://doi.org/10.1023/A:1021231503922

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