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Active surface area in oxide electrodes by overpotential deposited oxygen species for the oxygen evolution reaction

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Abstract

The electrochemical active surface area at oxide electrodes of Pt and electrodeposited Ni, Co and Ni20Co80 alloys was evaluated in 5m KOH solutions based on the charge for electrochemical desorption of a monolayer of overpotential deposited oxygen (OPD O) species. Thein situ technique empllyed for the charge measurement involves galvanostatic charging (OPD O) adsorption), followed by simple discharging (OPD O desorption) experiments. It is observed that surface area estimated by this new technique for the oxidized surfaces of the metals studied here are consistent with those from a.c. impedance spectroscopy. The activity of the metal towards the oxygen evolution reaction (OER) is also discussed in terms of their active surface area estimated in this study.

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Authors and Affiliations

  1. Département de Métallurgie et de Génie des Matériaux, Ecole Polytechnique de Montréal, succ. Centre-ville, Case Postale 6079, H3C 3A7, Montréal, Québec, Canada

    J. C. K. Ho & D. L. Piron

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  1. J. C. K. Ho
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  2. D. L. Piron
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Ho, J.C.K., Piron, D.L. Active surface area in oxide electrodes by overpotential deposited oxygen species for the oxygen evolution reaction. J Appl Electrochem 26, 515–521 (1996). https://doi.org/10.1007/BF01021975

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  • DOI: https://doi.org/10.1007/BF01021975

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