Oxygen reduction in acid media: effect of iron substitution by cobalt on heat-treated naphthalocyanine impregnations supported on preselected carbon blacks

A. Biloul, O. Contamin, G. Scarbeck, M. Savy, D. van den Ham, J. Riga, J.J. Verbist

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    Abstract

    FeNPc(1.2) impregnations were investigated at various loadings using a rotating-disk electrode, voltammetry and X-ray photoelectron spectroscopy (XPS) techniques. Optimal activity takes place at monolayer coverage, and major demetallation occurs after prolonged exposure to acid solution. The substitution of Fe by Co enables the electrochemical performances to reach those presented by 10% Pt on Vulcan and stops the demetallation process. The application of fast atomic bombardment secondary ion mass spectrometry (FABS) together with XPS sheds light on the detrimental role of some electrophilic groups attached to the carbon black-catalyst interface.
    Original languageEnglish
    Pages (from-to)163-186
    JournalJournal of electroanalytical chemistry
    Volume335
    Issue number1-2
    DOIs
    Publication statusPublished - 1992

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