Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 78, Issue -, Pages 170-175Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.10.070
Keywords
Defects; WTe2; Hydrogen evolution reaction; Plasma etching; Electrocatalysts
Funding
- National Natural Science Foundation of China [51728202, 51909165]
- China Postdoctoral Science Foundation [2020TQ0109, 2018M630986]
- Shenzhen Peacock Plan [827-000113]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- project Nanotechnology Based Functional Solutions - Norte Portugal Regional Operational Programme (NORTE2020) under the PORTUGAL 2020 Partnership Agreement through the European Regional Fund (ERDF) [NORTE-01-0145-FEDER-000019]
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Defect engineering in ultrathin tungsten telluride nanosheets improves hydrogen evolution by introducing tungsten vacancies through oxygen plasma etching, leading to a significant reduction in overpotential and Tafel slope for more efficient performance.
2D transition metal dichalcogenides (TMDs) have been considered as promising non-precious electro-catalysts for the hydrogen evolution reaction (HER). However, their limited active sites and poor electric conductivity pose a significant hurdle to their HER performance, resulting in a large overpotential. Here, we report the defect engineering in ultrathin tungsten telluride (WTe2) nanosheets with semimetal nature to improve hydrogen evolution effectively. We find that the oxygen plasma etching imposes a cutting effect on WTe2 nanosheets, resulting in a large number of tungsten vacancies. Particularly, the sample after plasma treatment for 10 min shows a feather-like structure with an overpotential of 251 mV at 10 mA/cm(2) and a Tafel slope of 94 mV/dec, which is 4 times lower than the Tafel slope of pristine nanosheets. Further first-principles calculations shed light on the evolution of defect-rich WTe2 nanosheets and offer rational explanation to their superiority in efficient hydrogen evolution. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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