Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction
The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS<sub>2</sub>-based material synthesized with L-cysteine. For this, a faci...
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| author | Arunas Jagminas Paulius Gaigalas Carla Bittencourt Vaclovas Klimas |
| author_facet | Arunas Jagminas Paulius Gaigalas Carla Bittencourt Vaclovas Klimas |
| author_sort | Arunas Jagminas |
| collection | DOAJ |
| description | The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS<sub>2</sub>-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec<sup>−1</sup>, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS<sub>2</sub>-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS<sub>2</sub>/MoO<sub>x</sub>, C nanostructures with the dominant 1T-MoS<sub>2</sub> phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS<sub>2</sub> and MoO<sub>2</sub>) and semiconducting (2H-MoS<sub>2</sub> and MoO<sub>3</sub>) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings. |
| first_indexed | 2024-03-09T05:59:17Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T05:59:17Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-9f834641a95e4b0e85faa4fd21d844942023-12-03T12:10:34ZengMDPI AGMaterials1996-19442021-03-01145116510.3390/ma14051165Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution ReactionArunas Jagminas0Paulius Gaigalas1Carla Bittencourt2Vaclovas Klimas3The Department of Electrochemical Materials Science, State Research Institute Center for Physical Sciences and Technology, Sauletekio ave. 3, LT-01257 Vilnius, LithuaniaThe Department of Electrochemical Materials Science, State Research Institute Center for Physical Sciences and Technology, Sauletekio ave. 3, LT-01257 Vilnius, LithuaniaChemie des Interactions Plasma-Surface, University of Mons, Place du Parc 22, 7000 Mons, BelgiumThe Department of Electrochemical Materials Science, State Research Institute Center for Physical Sciences and Technology, Sauletekio ave. 3, LT-01257 Vilnius, LithuaniaThe noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS<sub>2</sub>-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec<sup>−1</sup>, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS<sub>2</sub>-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS<sub>2</sub>/MoO<sub>x</sub>, C nanostructures with the dominant 1T-MoS<sub>2</sub> phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS<sub>2</sub> and MoO<sub>2</sub>) and semiconducting (2H-MoS<sub>2</sub> and MoO<sub>3</sub>) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings.https://www.mdpi.com/1996-1944/14/5/1165molybdenum disulfideL-cysteinehydrothermal synthesishybrid filmselectrocatalystwater splitting |
| spellingShingle | Arunas Jagminas Paulius Gaigalas Carla Bittencourt Vaclovas Klimas Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction Materials molybdenum disulfide L-cysteine hydrothermal synthesis hybrid films electrocatalyst water splitting |
| title | Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction |
| title_full | Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction |
| title_fullStr | Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction |
| title_full_unstemmed | Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction |
| title_short | Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction |
| title_sort | cysteine induced hybridization of 2d molybdenum disulfide films for efficient and stable hydrogen evolution reaction |
| topic | molybdenum disulfide L-cysteine hydrothermal synthesis hybrid films electrocatalyst water splitting |
| url | https://www.mdpi.com/1996-1944/14/5/1165 |
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