期刊
NANO RESEARCH
卷 12, 期 6, 页码 1301-1305出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2212-8
关键词
MoS2 monolayers; semimetallic 1T phase; 4H; fcc-Au nanorods; hydrogen evolution
类别
资金
- MOE under AcRF Tier 2 in Singapore [MOE2014-T2-2-093, MOE2015-T2-2-057, MOE2016-T2-2-103, MOE2017-T2-1-162]
- MOE under AcRF Tier 1 in Singapore [2016-T1-001-147, 2016-T1-002-051, 2017-T1-001-150, 2017-T1-002-119]
- NTU under Start-Up Grant in Singapore [M4081296.070.500000]
Controlled synthesis of transition metal dichalcogenide (TMD) monolayers with unusual crystal phases has attracted increasing attention due to their promising applications in electrocatalysis. However, the facile and large-scale preparation of TMD monolayers with high-concentration unusual crystal phase still remains a challenge. Herein, we report the synthesis of MoX2 (X = Se or S) monolayers with high-concentration semimetallic 1T phase by using the 4H/face-centered cubic (fcc)-Au nanorod as template to form the 4H/fcc-Au@MoX2 nanocomposite. The concentrations of 1T phase in the prepared MoSe2 and MoS2 monolayers are up to 86% and 81%, respectively. As a proof-of-concept application, the obtained Au@MoS2 nanocomposite is used for the electrocatalytic hydrogen evolution reaction (HER) in acid medium, exhibiting excellent performance with a low overpotential of 178 mV at the current density of 10 mA/cm(2), a small Tafel slope of 43.3 mV/dec, and excellent HER stability. This work paves a way for direct synthesis of TMD monolayers with high-concentration of unusual crystal phase for the electrocatalytic application.
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