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Journal of Applied Electrochemistry

, Volume 32, Issue 10, pp 1131–1140 | Cite as

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

  • M. ChatenetEmail author
  • L. Genies-Bultel
  • M. Aurousseau
  • R. Durand
  • F. Andolfatto
Article

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.

high concentration oxygen reduction platinum silver sodium hydroxide 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • M. Chatenet
    • 1
    Email author
  • L. Genies-Bultel
    • 1
  • M. Aurousseau
    • 1
  • R. Durand
    • 1
  • F. Andolfatto
    • 2
  1. 1.Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI, UMR 5631 CNRS-INP Grenoble associated to the UJF)ENSEEGSaint Martin d'Hères CedexFrance
  2. 2.Centre de Recherches Rhône-AlpesATOFINAPierre-Bénite CedexFrance

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