期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-33846-0
关键词
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资金
- National Natural Science Foundation of China [22071191, 21903058, 22172153]
- Key Research and Development Projects of Shaanxi Province [2021GXLH-Z-022]
- Key Scientific and Technological Innovation Team of Shaanxi Province [2020TD-001]
- Fundamental Research Funds for the Central Universities
- World-Class Universities (Disciplines) and the Characteristic Development Guidance Funds for the Central Universities
- Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Natural Science Foundation of Jiangsu Province [BK20190810]
- Users with Excellence Program of Hefei Science Center CAS [2021HSC-UE001]
- University of Science and Technology of China (USTC)
This article presents a synthesis method for single-layer NiFeB hydroxide nanosheets and demonstrates the effectiveness of electron-deficient boron in promoting the formation of high-oxidation-state Ni for improved oxygen evolution activity. Experimental results show that the incorporation of boron into a NiFe hydroxide can cause a cathodic shift of the Ni2+(OH)(2) -> Ni3+delta OOH transition potential and reduce the energy barriers for the reaction. As a result, the catalyst achieves a current density of 100 mA cm(-2) in 1 M KOH and is among the best Ni-based catalysts for this reaction.
Promoting the formation of high-oxidation-state transition metal species in a hydroxide catalyst may improve its catalytic activity in the oxygen evolution reaction, which remains difficult to achieve with current synthetic strategies. Herein, we present a synthesis of single-layer NiFeB hydroxide nanosheets and demonstrate the efficacy of electron-deficient boron in promoting the formation of high-oxidation-state Ni for improved oxygen evolution activity. Raman spectroscopy, X-ray absorption spectroscopy, and electrochemical analyses show that incorporation of B into a NiFe hydroxide causes a cathodic shift of the Ni2+(OH)(2) -> Ni3+delta OOH transition potential. Density functional theory calculations suggest an elevated oxidation state for Ni and decreased energy barriers for the reaction with the NiFeB hydroxide catalyst. Consequently, a current density of 100 mA cm(-2) was achieved in 1 M KOH at an overpotential of 252 mV, placing it among the best Ni-based catalysts for this reaction. This work opens new opportunities in electronic engineering of metal hydroxides (or oxides) for efficient oxygen evolution in water-splitting applications.
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