期刊
SMALL
卷 15, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201900964
关键词
1T-MoS2; 2H-MoS2; electrocatalytic activity; Fermi level; hydrogen evolution reaction
类别
资金
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51832004, 51521001, 51802239]
- National Key R&D Program of China [2016YFA0202603]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
- Fundamental Research Funds for the Central Universities [WUT: 2018IVA091, 2019IVB054, 2019III062JL]
In the hydrogen evolution reaction (HER), energy-level matching is a prerequisite for excellent electrocatalytic activity. Conventional strategies such as chemical doping and the incorporation of defects underscore the complicated process of controlling the doping species and the defect concentration, which obstructs the understanding of the function of band structure in HER catalysis. Accordingly, 2H-MoS2 and 1T-MoS2 are used to create electrocatalytic nanodevices to address the function of band structure in HER catalysis. Interestingly, it is found that the 2H-MoS2 with modulated Fermi level under the application of a vertical electric field exhibits excellent electrocatalytic activity (as evidenced by an overpotential of 74 mV at 10 mA cm(-2) and a Tafel slope of 99 mV per decade), which is superior to 1T-MoS2. This unexpected excellent HER performance is ascribed to the fact that electrons are injected into the conduction band under the condition of back-gate voltage, which leads to the increased Fermi level of 2H-MoS2 and a shorter Debye screen length. Hence, the required energy to drive electrons from the electrocatalyst surface to reactant will decrease, which activates the 2H-MoS2 thermodynamically.
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