Direct synthesis of 1T-phase MoS2 nanosheets with abundant sulfur-vacancies through (CH3)4N+ cation-intercalation for the hydrogen evolution reaction
| Autor: | Xin Wang, Jia Yu, Runqing Zhao, Weiguo Song, Lei Zhu, Lirong Zheng, Hongqiang Jin, Qikai Shen, Peipei Li, Changyan Cao, Weiming Chen, Yu Yu, Zhuo Kang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Aqueous solution Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry Intercalation (chemistry) chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur 0104 chemical sciences X-ray absorption fine structure Catalysis chemistry X-ray photoelectron spectroscopy Scanning transmission electron microscopy General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 9:13996-14003 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta03513d |
| Popis: | 1T-phase molybdenum disulphide (MoS2) is considered to be one of the most promising candidates to substitute noble metals in the hydrogen evolution reaction (HER). Fabricating single layer 1T-phase MoS2 with abundant sulfur vacancies as well as good stability to further enhance catalytic performance remains a challenge. Herein, we develop an efficient in situ TMA cation ((CH3)4N+) intercalation method to produce 1T-phase MoS2. The obtained MoS2 nanosheets comprise about 81% 1T-phase and abundant sulfur vacancies (>12%), as verified by aberration-corrected high-angle annular dark field scanning transmission electron microscopy (AC-HAADF-STEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), etc. In addition, the surface of as-prepared ST-MoS2 is negatively charged, making it very stable in aqueous solution. The as-prepared ST-MoS2 exhibits excellent electrochemical HER performance with a low over-potential and a small Tafel slope as well as superior cycling stability. Furthermore, it is an excellent co-catalyst when coupled with CdS nanowires to form a CdS/ST-MoS2 heterojunction photocatalyst for the HER under visible light irradiation. It achieves a maximum H2 production rate and apparent quantum efficiency (AQE) of approximately 1187 μmol mg−1 h−1 and 73.4%, respectively, which are significantly higher than those of reported CdS/MoS2 photocatalysts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|