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Surface extension of MeS2 (Me= Mo or W) nanosheets by embedding MeSx for hydrogen evolution reaction

Thang Phan Nguyen, Quyet Van Le, Seokhoon Choi, Tae Hyung Lee, Seung-Pyo Hong, Kyoung Soon Choi, Ho Won Jang, Min Hyung Lee, Tae Jung Park, Soo Young Kim
Two-dimensional transition metal dichalcogenides (2D-TMDs), such as MoS2 and WS2nanosheets (MeS2-NS), are reported as efficient catalysts for hydrogen evolution reaction (HER), which can potentially replace the expensive platinum catalyst. In this report, 1T phase MeS2 (1T-MeS2) NS are synthesized by lithium-intercalation exfoliation method, subsequently being modified by amorphous MoSx and WSx (MeSx@MeS2-NS) through a solvothermal method. Interestingly, MeSx@MeS2-NS significantly improves the HER performance compared with bare MeS2-NS as catalysts. Among these, MoSx@MoS2 is observed to be the best combination for HER, with an onset potential and Tafel slope of 114 mV and 45.1 mV decade−1, respectively. The enhancement in the HER device using MeSx@MeS2-NS as the catalyst originates from vertically grown MeSx, which provides additional active sulfur sites for the …

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