Superior Hydrogen Evolution Reaction Performance in 2H‐MoS₂ to that of 1T Phase

Abstract

Water splitting using electricity generated by wind or solar power has been proposed as an effective strategy for sustainable hydrogen production. [1][2][3] Among the family of hydrogen 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-MoS 2 and 1T-MoS 2 are used to create electrocatalytic nanodevices to address the function of band structure in HER catalysis. Interestingly, it is found that the 2H-MoS 2 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-MoS 2 . 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-MoS 2 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-MoS 2 thermodynamically.

H2‐Directing Strategy on In Situ Synthesis of Co‐MoS2 with Highly Expanded Interlayer for Elegant HER Activity and its Mechanism

“…Development of clean and renewable energy is urgently demanded nowadays, due to a great deal of environmental problems aroused by fossil fuels. [ 1–2 ] Hydrogen is considered to be one of the most promising alternatives of energy carriers, [ 3–5 ] due to its advantages of high energy density and sustainable production from water splitting. The electrochemical hydrogen evolution reaction (HER) has been widely accepted as one type of desirable method to produce hydrogen for renewable energy, wherein the Pt‐based catalysts perform most top activities towards HER.…”

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

“…regulated the electrocatalytic HER of 2H MoS 2 with the assist of a gate electric field. [ 91 ] As shown in Figure 3f, as gate voltage increases from 0 to 3 V, the overpotential at −10 mA cm −2 decreases markedly from 228 to 74 mV. At a gate voltage of 3 V, the gated 2H MoS 2 achieves catalytic activity far beyond 1T MoS 2 in terms of overpotential (74 mV vs 187 mV).…”

Design of Hybrid Zeolitic Imidazolate Framework‐Derived Material with C–Mo–S Triatomic Coordination for Electrochemical Oxygen Reduction

“…(Figure S5b,c, Supporting Information). [29] High-angle annular dark-field (HAADF) image combined with the elemental mapping images indicate that the distribution of S and C is correlated with Mo (Figure 2g-i).…”