Electrodeposited Ni–Co-oxide electrodes:characterization and kinetics of the oxygen evolution reaction

In this paper we present results on the characterization of Ni–Co-oxide electrodes, prepared by anodic deposition from Co(NO 3) 2 aqueous solutions on Ni substrates. The kinetics and mechanism of oxygen evolution was analysed. Tafel slopes close to 40 mV per decade were measured. The reaction order...

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Bibliographic Details
Published in:International journal of hydrogen energy 2000-12, Vol.25 (12), p.1163-1170
Main Authors: Castro, E.B, Gervasi, C.A
Format: Article
Language:English
Subjects:
Anodic catalysts
Chemistry
Cobalt oxides
Electrochemistry
Exact sciences and technology
General and physical chemistry
Oxygen evolution reaction
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Summary:In this paper we present results on the characterization of Ni–Co-oxide electrodes, prepared by anodic deposition from Co(NO 3) 2 aqueous solutions on Ni substrates. The kinetics and mechanism of oxygen evolution was analysed. Tafel slopes close to 40 mV per decade were measured. The reaction order with respect to [OH −] was found to be approximately 2 at 25°C. A possible mechanism for oxygen evolution on these electrodes is presented, which accounts for the values of the kinetic parameters experimentally obtained.
ISSN:0360-3199
1879-3487
DOI:10.1016/S0360-3199(00)00033-1