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Synthesis of MoX2 (X = Se or S) monolayers with high-concentration 1T′ phase on 4H/fcc-Au nanorods for hydrogen evolution

Authors :
Lin Gu
Qipeng Lu
Zhengqing Liu
Ye Chen
Meiting Zhao
Bo Chen
Junze Chen
Xue-Jun Wu
Hua Zhang
Yue Gong
Zhicheng Zhang
Yaping Du
Qinglang Ma
Xiao Zhang
Pengfei Yin
Hongfei Cheng
Source :
Nano Research. 12:1301-1305
Publication Year :
2019
Publisher :
Springer Science and Business Media LLC, 2019.

Abstract

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/cm2, 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.

Details

ISSN :
19980000 and 19980124
Volume :
12
Database :
OpenAIRE
Journal :
Nano Research
Accession number :
edsair.doi...........12b4ce4b9abd0d3bf9e4efaf290e33d1