研究目的
To develop an efficient and clean top-down method to prepare few-layer MoS2 nanosheets from bulk MoS2 powder using one-step laser irradiation in liquid, enhancing the conductivity and electrocatalytic activity toward HER.
研究成果
The study successfully developed a one-step laser exfoliation method to prepare few-layer MoS2 nanosheets with abundant S vacancies and 1T phase, significantly enhancing HER activity. The choice of protic solvent was critical in facilitating S vacancy formation and phase transition. The method offers a clean, fast, and high-yield synthetic strategy for producing stable and S vacancy-rich 1T-MoS2.
研究不足
The method requires precise control of laser irradiation conditions and solvent selection to achieve desired phase transition and S vacancy formation. Prolonged irradiation may lead to excessive S loss and formation of metallic Mo.
1：Experimental Design and Method Selection:
Pulsed laser irradiation in liquid (PLIL) technique was used for the one-step exfoliation of bulk MoS2 to few-layer MoS2 nanosheets.
2：Sample Selection and Data Sources:
Bulk MoS2 powder was dispersed in various protic solvents and irradiated with laser under Ar gas protection.
3：List of Experimental Equipment and Materials:
A nanosecond pulsed Nd:YAG laser machine was used for laser ablation. Materials included bulk MoS2 powder, various solvents, and Ar gas.
4：Experimental Procedures and Operational Workflow:
Bulk MoS2 was dispersed in solvents, irradiated with laser for predetermined times, filtered, washed, and dried to obtain few-layer MoS2 nanosheets.
5：Data Analysis Methods:
The samples were characterized by XRD, TEM, XPS, Raman spectroscopy, EDS, and EPR. Electrochemical properties were investigated using a three-electrode system.
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