期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 39, 页码 12840-12844出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808818
关键词
electrocatalysts; heterogeneous catalysis; oxygen evolution; water electrolysis; X-ray absorption spectroscopy
资金
- National Science Foundation [CHE-1566348]
- Nancy and Stephen Grand Technion Energy Program (GTEP)
- Ministry of Science and Technology (MOST), Israel
- DOE Office of Science User Facility [DE-AC02-05CH11231]
Iron cations are essential for the high activity of nickel and cobalt-based (oxy)hydroxides for the oxygen evolution reaction, but the role of iron in the catalytic mechanism remains under active investigation. Operando X-ray absorption spectroscopy and density functional theory calculations are used to demonstrate partial Fe oxidation and a shortening of the Fe-O bond length during oxygen evolution on Co(Fe)OxHy. Cobalt oxidation during oxygen evolution is only observed in the absence of iron. These results demonstrate a different mechanism for water oxidation in the presence and absence of iron and support the hypothesis that oxidized iron species are involved in water-oxidation catalysis on Co(Fe)OxHy.
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