期刊
Nature Communications
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms14169
关键词
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资金
- Lundbeck Foundation
- Villum Foundation
- European Research Council (ERC) [239834]
- U.S. Department of Energy Office of Basic Energy Science
- SLAC National Accelerator Lab LDRD program
- Agency for Administration of University and Research Grants of Catalonia (AGAUR) [2013 BP-A 00464]
- DOE [DE-AC02-05CH11231]
- Lundbeck Foundation [R95-2012-10483] Funding Source: researchfish
- Villum Fonden [00013264] Funding Source: researchfish
Transition metal oxides show great promise as Earth-abundant catalysts for the oxygen evolution reaction in electrochemical water splitting. However, progress in the development of highly active oxide nanostructures is hampered by a lack of knowledge of the location and nature of the active sites. Here we show, through atom-resolved scanning tunnelling microscopy, X-ray spectroscopy and computational modelling, how hydroxyls form from water dissociation at under coordinated cobalt edge sites of cobalt oxide nanoislands. Surprisingly, we find that an additional water molecule acts to promote all the elementary steps of the dissociation process and subsequent hydrogen migration, revealing the important assisting role of a water molecule in its own dissociation process on a metal oxide. Inspired by the experimental findings, we theoretically model the oxygen evolution reaction activity of cobalt oxide nanoislands and show that the nanoparticle metal edges also display favourable adsorption energetics for water oxidation under electrochemical conditions.
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