The effect of iron hydroxide on nickelous hydroxide electrodes with emphasis on the oxygen evolution reaction |
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| Affiliation: | 1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Department of Chemical & Process Engineering, Moi University, 3900-3100 Eldoret, Kenya;3. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China;4. Beijing Yanjing Beer Co. Ltd., Beijing 101300, China |
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| Abstract: | 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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