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Studies concerning charged nickel hydroxide electrodes. VIII. The relative potentials of the β-/γ -nickel oxy hydroxide reduction processes

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Abstract

In this communication it is demonstrated that a partly chargedβ-Ni(OH)2/β-NiOOH couple can oxidizeα-Ni(OH)2 to theγ-phase. This observation is in accordance with the order of the reversible potentials and illustrates the greater stability of theγ-phase in 7 mol dm−3 KOH. Contrary to several claims in the literatureβ-NiOOH undergoes reduction over a range of potentials from 400 to 300 mV wrt Hg/HgO/KOH whilst theγ-phase containing Ni4+ species undergoes reduction usually at less positive potentials (below 300 mV).

Internal oxidation/reduction reactions between various α/γ and β/β-phase couples can be expected to take place in partly charged electrodes during open circuit stand periods in addition to oxygen evolution. Ageing of oxidized phases may also lead to changes in free energies. Both types of process may lead to shifting of peaks after open circuit stand periods.

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Authors and Affiliations

  1. Group Technical Centre, Berec Group Limited, St. Ann 's Road, N15 3TJ, London, UK

    R. Barnard & C. F. Randell

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  1. R. Barnard
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  2. C. F. Randell
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Barnard, R., Randell, C.F. Studies concerning charged nickel hydroxide electrodes. VIII. The relative potentials of the β-/γ -nickel oxy hydroxide reduction processes. J Appl Electrochem 13, 97–101 (1983). https://doi.org/10.1007/BF00615893

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  • DOI: https://doi.org/10.1007/BF00615893

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