NICKEL–COBALT oxide-coated electrodes: influence of the preparation technique on oxygen evolution reaction (OER) in an alkaline solution

The oxygen evolution reaction (OER) was investigated at 60°C in 15 wt% NaOH solution on NiCo 2O 4 electrodes. Nickel–cobalt oxides were obtained by different preparation techniques and they were applied to chemically pickled nickel plates. Fresh and artificially aged electrodes were subjected to ele...

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Bibliographic Details
Published in:International journal of hydrogen energy 1999, Vol.24 (1), p.21-26
Main Authors: Bocca, C, Barbucci, A, Delucchi, M, Cerisola, G
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Energy
Exact sciences and technology
Fuels
Hydrogen
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Summary:The oxygen evolution reaction (OER) was investigated at 60°C in 15 wt% NaOH solution on NiCo 2O 4 electrodes. Nickel–cobalt oxides were obtained by different preparation techniques and they were applied to chemically pickled nickel plates. Fresh and artificially aged electrodes were subjected to electrochemical tests. The ageing was performed for 21 days. The correlation between the coating preparations and their electrochemical performances was investigated by analysis of the electrochemical data. The efficiency of the NiCo 2O 4 electrodes changed significantly with the changing of the preparation method. Two Tafel slopes for the OER were observed in most cases. This behaviour was interpreted on the basis of a change in the valence state of the oxide. The kinetic parameters obtained on NiCo 2O 4 electrodes were compared and discussed according to the preparation methods.
ISSN:0360-3199
1879-3487
DOI:10.1016/S0360-3199(98)00012-3