Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 505, Issue 1-2, Pages 118-124Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(01)00469-7
Keywords
electrocatalysis; oxygen reduction; kinetics; copper-nickel alloys
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The reduction of oxygen on single phase Cu90Ni10 and Cu70Ni30 alloys in contact with 0.1 M borax at pH 9.2 has been investigated. The rate constant measured is independent of alloy composition for steady-state measurements. When the currents are measured in sweep experiments the current densities are larger for the alloy richer in nickel, indicating slow surface equilibrium processes. The value of n is 3.5 +/- 0.2 for pre-reduced electrodes in a wide potential range, from -1.5 to -0.8 V versus the Hg \ Hg2SO4 \ K2SO4 (sat) electrode. The proposed reduction mechanism involves a bifurcation between a direct and a sequential mechanism involving O-2 chemisorbed on Cu(0). O 2001 Elsevier Science B.V. All rights reserved.
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