期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 44, 页码 17370-17380出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta07425a
关键词
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资金
- National Natural Science Funds for Excellent Young Scholar [51422104]
- National Natural Science Foundation of China [51531004, 51272173, 51472177]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201145]
Layered transition metal dichalcogenides (TMDs), such as MoS2, WS2, MoSe2, WSe2, etc., have received considerable interest recently due to their unique properties and fascinating applications. In this work, we proposed a NaCl template-assisted in situ chemical vapor deposition (CVD) strategy for synthesizing high-quality two-dimensional (2D) WS2, MoS2, MoSe2 and WSe2 nanosheets with a single-crystalline structure on a large scale. During the synthesis, 3D self-assembly of cubic NaCl particles can not only provide smooth surfaces to support the lateral growth, but also create a 2D confined space to restrict the thickening of TMD nanosheets, while the high-temperature annealing during the CVD process ensures high crystallinity and structural stability as well as remarkably promoting the conductivity of the TMD nanosheets. When evaluated as sodium-ion battery anodes, the representative WS2 nanosheets exhibited a high reversible specific capacity of 453 mA h g(-1) at a current density of 0.1 A g(-1), an excellent cycling performance and a greatly enhanced rate capability. The charge storage mechanism together with the microstructure evolution of WS2 nanosheets during the sodiation/disodiation processes is responsible for their superior sodium storage performance.
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