Oxygen reduction in an acid medium - electrocatalysis by CoNPc (1,2) impregnated on a carbon black support - effect of loading and heat treatment

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

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    Abstract

    O2 reduction in an acid medium has been investigated on a transition metal macrocycle, CoNPc(1,2), impregnated on a carbon black support with a high dibutylphthalate adsorption value, using a rotating disk electrode and voltammetry techniques described previously, combined with X-ray photoelectron spectroscopy measurements. Optimal activity was found for a bilayer coverage (n = 2) at 17%-18% w/w loading. Heat treatment seems to be beneficial for n 3: it increases the overall number N of exchanged electrons and improves the electrode wetting. For the most active samples, mixed Co(II)/Co(III) valencies were displayed.
    Original languageUndefined
    Pages (from-to)189-204
    JournalJournal of electroanalytical chemistry
    Volume1-2
    Issue number350
    DOIs
    Publication statusPublished - 1993

    Keywords

    • IR-11692
    • METIS-106290

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