Influence of iron doping on tetravalent nickel content in catalytic oxygen evolving films.
basic_science · Level V
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- Record sourced from PubMed, PMID 28137835.
- Also identified by DOI 10.1073/pnas.1620787114 and PMC identifier 5321006.
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Abstract
Iron doping of nickel oxide films results in enhanced activity for promoting the oxygen evolution reaction (OER). Whereas this enhanced activity has been ascribed to a unique iron site within the nickel oxide matrix, we show here that Fe doping influences the Ni valency. The percent of Fe<sup>3+</sup> doping promotes the formation of formal Ni<sup>4+</sup>, which in turn directly correlates with an enhanced activity of the catalyst in promoting OER. The role of Fe<sup>3+</sup> is consistent with its behavior as a superior Lewis acid.