期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 1, 页码 696-703出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b15617
关键词
electrocatalysis; water splitting host-guest interaction; hydrogen evolution reaction; two-dimensional material
资金
- NSFC [21771079, 21673094, 21673093, 21373099, 21573090, 21371070]
- National Key R&D Program of China [2017YFA0207800]
- Science and Technology Research Program of Education Department of Jilin Province [410, JJKH20170780KJ]
- Jilin Province Science and Technology Development Plan [20160101291JC, 20170101175JC, 20150101005JC, 20170101141JC]
- Young Elite Scientist Sponsorship Program by CAST
The hydrogen evolution reaction (HER) is involved in energy-intensive water- and chlor-alkali electrolyzers, and thus, highly active and stable HER electrocatalysts in alkaline media are needed. Titanates, a family of representative two-dimensional materials with negatively charged main layers, are chemically and structurally stable under strongly basic conditions, but they have never been shown to have electrocatalytic activity for HER. Herein, we report that intercalating 3d metal cations, including Fe3+, Co2+, Ni2+, and Cu2+ ions, into the interlayer regions of titanates yields efficient and robust electrocatalysts for the alkaline HER. The intercalation of 3d metal cations in titanates is achieved by rapid cation-exchange reaction between Na+-containing titanates and 3d metal cations at room temperature. Among the 3d metal-intercalated titanates we synthesize, the Co2+-containing material is found to show the best electrocatalytic activity. Experimental and theoretical results reveal that the strong electronic interaction between 3d metal cations and negatively charged main [TiO6](infinity) layers renders good catalytic activity to the outermost oxygen atoms in the [TiO6](infinity) layer, further making 3d metal-intercalated titanate an efficient electrocatalyst for the HER.
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