An investigation of thin-film Ni-Fe oxide catalysts for the electrochemical evolution of oxygen

  • Louie M
  • Bell A
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Abstract

A detailed investigation has been carried out of the structure and electrochemical activity of electrodeposited Ni–Fe films for the oxygen evolution reaction (OER) in alkaline electrolytes. Ni–Fe films with a bulk and surface composition of 40% Fe exhibit OER activities that are roughly 2 orders of magnitude higher than that of a freshly deposited Ni film and about 3 orders of magnitude higher than that of an Fe film. The freshly deposited Ni film increases in activity by as much as 20-fold during exposure to the electrolyte (KOH); however, all films containing Fe are stable as deposited. The oxidation of Ni(OH)2 to NiOOH in Ni films occurs at potentials below the onset of the OER. Incorporation of Fe into the film increases the potential at which Ni(OH)2/NiOOH redox occurs and decreases the average oxidation state of Ni in NiOOH. The Tafel slope (40 mV dec–1) and reaction order in OH– (1) for the mixed Ni–Fe films (containing up to 95% Fe) are the same as those for aged Ni films. In situ Raman spectra ac...

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Authors

  • Alexis BellUniversity of California Berekeley Department of Chemical and Biomolecular Engineering

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  • Mary W. Louie

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