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Title: Carbon doping switching on the hydrogen adsorption activity of NiO for hydrogen evolution reaction

Journal Article · · Nature Communications

Hydrogen evolution reaction (HER) is more sluggish in alkaline than in acidic media because of the additional energy required for water dissociation. Numerous catalysts, including NiO, that offer active sites for water dissociation have been extensively investigated. Yet, the overall HER performance of NiO is still limited by lacking favorable H adsorption sites. Here we show a strategy to activate NiO through carbon doping, which creates under-coordinated Ni sites favorable for H adsorption. DFT calculations reveal that carbon dopant decreases the energy barrier of Heyrovsky step from 1.17 eV to 0.81 eV, suggesting the carbon also serves as a hot-spot for the dissociation of water molecules in water-alkali HER. As a result, the carbon doped NiO catalyst achieves an ultralow overpotential of 27 mV at 10 mA cm-2, and a low Tafel slope of 36 mV dec-1, representing the best performance among the state-of-the-art NiO catalysts.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); National Key Research and Development Program of China; Natural Science Fund of China
Grant/Contract Number:
AC02-05CH11231; SC0012704; ACI-1548562; AST 1828315; TG-DMR160105
OSTI ID:
1603613
Journal Information:
Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 121 works
Citation information provided by
Web of Science

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