期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 9, 页码 4981-4991出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta08226d
关键词
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资金
- National Natural Science Foundation of China [51972024]
- Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities) [FRF-IDRY-19-020]
- Youth Teacher International Exchange & Growth Program (Fundamental Research Funds for the Central Universities) [QNXM20210016]
- Scientific and Technological Innovation Foundation of Shunde Graduate School, University of Science and Technology Beijing [BK19AE029]
A general method for preparing efficient noble metal-free electrocatalysts for hydrogen evolution reaction (HER) was proposed. The introduction of W atoms optimized the electronic structure and enhanced the activity and exposure of active sites, resulting in low overpotentials. This strategy can also be applied to other metals.
Hydrogen evolution reaction (HER) electrocatalysts that are free of noble metals are highly desirable for energy conversion applications. Herein, a general hydrothermal-impregnation-pyrolysis process is proposed to introduce W into Co nanoparticles surrounded by N-doped carbon to obtain CoW@N-C hybrids supported on nickel foam (NF) as high-efficiency HER electrocatalysts (CoW-py-T@NF). The experimental and calculation results show that the introduced W atoms could optimize the electronic structure of Co@N-C, which is conducive to charge transfer, reaction kinetics, and active site exposure, as well as intrinsic activity enhancement. As a result, the obtained Co1.5W0.5-py-500@NF exhibits excellent HER performance, achieving current densities of 25 and 100 mA cm(-2) in 1.0 M KOH, requiring only extremely low overpotentials of 55 and 100 mV, respectively. Importantly, this fascinating strategy can be applied to other metals (M = Cr, Mo, or Ce) to obtain CoM@N-C HER electrocatalysts with high efficiency.
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