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The potentiodynamic behaviour of Co(OH)2 hydroxide electrodes is studied in the potential range related to the appearance of Co(III) and Co(IV) species. The corresponding electrochemical reactions involve relatively fast proton transfer processes occurring at potentials close to those predicted from thermodynamics. Sandwich-type structures of the eleclrode/film/solution interface are assumed in the interpretation of the processes. They probably include configurational changes of reactants and products participating in the various electrochemical reactions.

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