单原子铁在硫化钼上的组装及电催化析氢

doi:10.11896/cldb.21100048

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Abstract The precious metal Pt has the highest hydrogen evolution activity, but its high price limits its widespread application. Therefore, the research and development of high-activity and low-cost hydrogen evolution electrocatalytic materials is of great significance to the development of the hydrogen energy industry. In this work, a two-step hydrothermal reaction method was used to successfully assemble single-atoms of Fe on molybdenum sulfide, prepared ofresulting in single-atoms of Fe on MoS₂ to form Fe-MoS₂ electrocatalytic hydrogen evolution material. X-ray powder diffraction (XRD), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectroscopy (EDX) and electron spectroscopy (XPS) were used to characterize and analyze the synthesized Fe-MoS₂. XRD results showed that the powder diffraction patterns of the as-synthesized Fe-MoS₂ sample are consistent with that of crystalline 2H-MoS₂ (JCPDS 37-1492), indicating that Fe-MoS₂ and 2H-MoS₂ have the same crystal structure;Spherical aberration electron microscope displayed single-atoms of iron were uniformly dispersed on MoS₂;EDX and XPS analysis further showed that the single iron atoms exist on the MoS₂ structure.The hydrogen evolution performance of Fe-MoS₂ was studied by linear sweep voltammetry (LSV).The results showed that the Fe-MoS₂ synthesized under the optimal conditions has a hydrogen evolution overpotential of only 101 mV at the current density of 10 mA·cm^-2, whereas the hydrogen evolution overpotential of pure MoS₂ under the same conditions is 462 mV, its overpotential is reduced by 361 mV. The Tafel slope of pure MoS₂ is 433 mV/dec, while that of single-atom Fe-MoS₂ is only 64 mV/dec. EDTA and F-ion were used as probe molecules to test the active sites of hydrogen evolution, the results show that the hydrogen evolution overpotential rises rapidly, when EDTA and F ions were added to 1.0 mol/L KOH solution. It is concluded that single atoms of iron are active sites for HER. In addition, studies have shown that the hydrogen evolution mechanism of single-atom Fe-MoS₂ follows the Volmer-Heyrovsky mechanism.

Key words： single-atom iron molybdenum disulfide assembly electrocatalyst hydrogen evolution reaction

Published: 10 June 2023 Online: 2023-06-19

CLC number:

TK91

Fund:National Natural Science Foundation of China (21576175).

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	Articles by authors
	QIN Chao
	ZHANG Xin
	ZHOU Yilun
	MENG Zeda
	LIU Shouqing

Cite this article:

QIN Chao,ZHANG Xin,ZHOU Yilun, et al. Assembly of Single-atom Iron on Molybdenum Disulfide and Electrocatalytic Hydrogen Evolution Reaction[J]. Materials Reports, 2023, 37(11): 21100048-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21100048 OR http://www.mater-rep.com/EN/Y2023/V37/I11/21100048

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