研究目的
To improve the HER activity of MoS2 by exposing more active sites and improving the conductivity of MoS2 materials through the fabrication of porous high-content 1T phase MoS2 film.
研究成果
The porous high-content 1T MoS2 film fabricated by PLD shows outstanding catalytic activity for HER under acidic conditions, attributed to better electron transport, more active sites, and the prevention of oxidation by sulfur addition. This study provides a new strategy for the structural design of MoS2 for various applications.
研究不足
The metastable nature of the 1T phase MoS2 may lead to stability issues over time. The process of pulse laser deposition may induce deficiency of chalcogen atoms, leading to oxidation.
1：Experimental Design and Method Selection
Pulsed laser deposition (PLD) method was used to exfoliate bulk MoS2 and form small-size MoS2 clusters, which were then diluted in solid sulfur to form porous films. The 1T phase MoS2 ratio was modulated by adding different contents of sulfur into the MoS2 target.
2：Sample Selection and Data Sources
Bulk MoS2 (Alfa Aesar 99% pure) mixed with sulfur powder (Alfa Aesar 99% pure) by different stoichiometric ratios to prepare composited targets.
3：List of Experimental Equipment and Materials
Nd:YAG laser (laser frequency=10 Hz, λ=1064 nm), FEI Titan G2 60-300 (AC-TEM), FESEM; Hitachi S-4800, Japan, XPS (Thermo Scientific ESCALab 250Xi), Raman spectroscopy (532 nm laser, Renishaw inVia).
4：Experimental Procedures and Operational Workflow
The MoS2/S films were deposited by PLD at room temperature, followed by annealing treatment at 150 °C in nitrogen atmosphere. The films were characterized by SEM, TEM, XPS, and Raman spectroscopy. Electrochemical measurements were performed in a 0.5 M H2SO4 solution.
5：Data Analysis Methods
The HER performance was evaluated by linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The content of 1T and 2H phases was evaluated by XPS and Raman spectroscopy.
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