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Salt-Induced High-Density Vacancy-Rich 2D MoS 2 for Efficient Hydrogen Evolution.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Apr; Vol. 36 (17), pp. e2304808. Date of Electronic Publication: 2023 Aug 22. - Publication Year :
- 2024
-
Abstract
- Emerging non-noble metal 2D catalysts, such as molybdenum disulfide (MoS <subscript>2</subscript> ), hold great promise in hydrogen evolution reactions. The sulfur vacancy is recognized as a key defect type that can activate the inert basal plane to improve the catalytic performance. Unfortunately, the method of introducing sulfur vacancies is limited and requires costly post-treatment processes. Here, a novel salt-assisted chemical vapor deposition (CVD) method is demonstrated for synthesizing ultrahigh-density vacancy-rich 2H-MoS <subscript>2</subscript> , with a controllable sulfur vacancy density of up to 3.35 × 10 <superscript>14</superscript>  cm <superscript>-2</superscript> . This approach involves a pre-sprayed potassium chloridepromoter on the growth substrate. The generation of such defects is closely related to ion adsorption in the growth process, the unstable MoS <subscript>2</subscript> -K-H <subscript>2</subscript> O triggers the formation of sulfur vacancies during the subsequent transfer process, and it is more controllable and nondestructive when compared to traditional post-treatment methods. The vacancy-rich monolayer MoS <subscript>2</subscript> exhibits exceptional catalytic activity based on the microcell measurements, with an overpotential of ≈158.8 mV (100 mA cm <superscript>-2</superscript> ) and a Tafel slope of 54.3 mV dec <superscript>-1</superscript> in 0.5 m H <subscript>2</subscript> SO <subscript>4</subscript> electrolyte. These results indicate a promising opportunity for modulating sulfur vacancy defects in MoS <subscript>2</subscript> using salt-assisted CVD growth. This approach represents a significant leap toward achieving better control over the catalytic performances of 2D materials.<br /> (© 2023 Wiley‐VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 36
- Issue :
- 17
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 37505096
- Full Text :
- https://doi.org/10.1002/adma.202304808