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The colloidal electrodes formed by co‐precipitation of hydrous hydroxides on Pt, C, Au, or Ni can be classified into three groups according to the extent of the interaction between the two hydroxides.

028ChemInform Abstract The electrochemical behavior of mixed Ni(OH)2/Fe(OH)2 electrodes either as a coprecipitated layer or as a sandwich-type structure layer by layer precipitated, is investigated. A particularly high catalytic activity toward the OER is observed for coprecipitated electrodes which contain a mixed hydrated oxide. The catalytic activity of layer by layer precipitated electrodes depends on the sequence of precipitation. Loss of efficiency is observed when the inner layer is made of Fe(OH)2 because of a poisoning of the electrode (kinetic and mechanistic aspects).