期刊
ADVANCED ENERGY MATERIALS
卷 7, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700381
关键词
hydrogen evolution; nickel boride; oxygen evolution; water oxidation; water splitting; XAFS
类别
资金
- US National Science Foundation (NSF) [1213182]
- Cluster of Excellence RESOLV at RUB - Deutsche Forschungsgemeinschaft [EXC 1069]
- German Federal Ministry of Education and Research (Bundesministerium fur Bildung und Forschung, BMBF) [03SF0523C, CO2EKAT]
- Department of Energy
- MRCAT
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Generalitat de Catalunya [2014 SGR 1638]
- Spanish MINECO
- ICN2 Severo Ochoa Excellence Program
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213182] Funding Source: National Science Foundation
The overriding obstacle to mass production of hydrogen from water as the premium fuel for powering our planet is the frustratingly slow kinetics of the oxygen evolution reaction (OER). Additionally, inadequate understanding of the key barriers of the OER is a hindrance to insightful design of advanced OER catalysts. This study presents ultrathin amorphous high-surface area nickel boride (NixB) nanosheets as a low-cost, very efficient and stable catalyst for the OER for electrochemical water splitting. The catalyst affords 10 mA cm(-2) at 0.38 V overpotential during OER in 1.0 m KOH, reducing to only 0.28 V at 20 mA cm(-2) when supported on nickel foam, which ranks it among the best reported nonprecious catalysts for oxygen evolution. Operando X-ray absorption fine-structure spectroscopy measurements reveal prevalence of NiOOH, as well as Ni-B under OER conditions, owing to a Ni-B core@ nickel oxyhydroxide shell (Ni-B@NiOxH) structure, and increase in disorder of the NiOxH layer, thus revealing important insight into the transient states of the catalyst during oxygen evolution.
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