Low-temperature synthesis of molybdenum sulfides, tungsten sulfides, and composites thereof as efficient electrocatalysts for hydrogen evolution reaction
- Authors
- Do, H.H.; Ha, T.D.C.; Jo, H.; Ok, K.M.; Cho, J.H.; Ahn, Sang Hyun; Kim, M.-G.; Kim, S.Y.
- Issue Date
- 1-Feb-2022
- Publisher
- Elsevier B.V.
- Keywords
- Composites; Electrocatalysts; Hydrogen evolution reaction; Molybdenum sulfides; Tungsten sulfides
- Citation
- Applied Surface Science, v.576
- Journal Title
- Applied Surface Science
- Volume
- 576
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/51671
- DOI
- 10.1016/j.apsusc.2021.151828
- ISSN
- 0169-4332
1873-5584
- Abstract
- In this work, we report a one-step approach for synthesizing molybdenum sulfides and tungsten sulfides, using (N2H5)2MS4 (M = Mo, W) as highly energetic self-catalytic redox precursors and inducing a thermolysis process at various temperatures. These materials’ thermodynamic advantages facilitate the formation of molybdenum/tungsten sulfides at low temperatures. As expected, MoSx-100 °C (which features the [Mo3S13]2− active site model) exhibits the highest catalytic activity of the reported molybdenum sulfides. In addition, an optimized sample of crystalline WS2 was reported to produce hydrogen at 400 °C. Furthermore, the combination of carbon materials significantly enhanced the hydrogen production performance. The optimal sample of reduced graphite oxide (rGO)/MoSx-100 °C required an overpotential of only 125 mV to achieve a current density of 10 mA cm−2 and a shallow Tafel slope of 48.8 mV dec−1; this was attributed to the increased charge transfer from rGO. Furthermore, the catalyst exhibited good stability after 2000 cycles and 12 h of testing. This work may provide an alternative approach for the large-scale synthesis of transition metal dichalcogenides in high-performance catalyst applications. © 2021
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