Add time:08/22/2019         Source:sciencedirect.com

The electrochemical response of mixed Ni(OH)2 and Fe(OH)2 electrodes prepared either by chemical coprecipitation or layer by layer precipitation in alkaline solutions at 25°C was studied. Ni(OH)2 coprecipitated with Fe(OH)2 forms a mixed hydrated oxide with specially high catalytic activity towards the oxygen evolution reaction (OER). In layer by layer precipitated electrodes, the catalytic activity for the OER depends on the sequence of precipitation of the hydroxides and there is a loss of efficiency when the inner layer is made of Fe(OH)2 because of a poisoning of the electrode. Kinetic and mechanistic aspects are discussed. Some long term experiments at controlled potential were also carried out.

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