The preparation of Ni oxide electrodes suitable for quantitative work is discussed and methods for preparing Ni oxide layers in NaClO solution and by electrodeposition are described. Polarization curves for both types of electrode at constant current in KOH solution are discussed and it is shown that the coulombic efficiency of the electrode reaction may approach 100 % in suitable conditions. Results are discussed with brief reference to the changes in composition of the oxide layer during charging and discharging.
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