High phase-purity 1T′-MoS2- and 1T′-MoSe2-layered crystals

Yifu Yu, Gwang Hyeon Nam, Qiyuan He, Xue Jun Wu, Kang Zhang, Zhenzhong Yang, Junze Chen, Qinglang Ma, Meiting Zhao, Zhengqing Liu, Fei Rong Ran, Xingzhi Wang, Hai Li, Xiao Huang, Bing Li, Qihua Xiong, Qing Zhang, Zheng Liu, Lin Gu, Yonghua DuWei Huang, Hua Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

805 Citations (Scopus)

Abstract

Phase control plays an important role in the precise synthesis of inorganic materials, as the phase structure has a profound influence on properties such as conductivity and chemical stability. Phase-controlled preparation has been challenging for the metallic-phase group-VI transition metal dichalcogenides (the transition metals are Mo and W, and the chalcogens are S, Se and Te), which show better performance in electrocatalysis than their semiconducting counterparts. Here, we report the large-scale preparation of micrometre-sized metallic-phase 1T′-MoX2 (X = S, Se)-layered bulk crystals in high purity. We reveal that 1T′-MoS2 crystals feature a distorted octahedral coordination structure and are convertible to 2H-MoS2 following thermal annealing or laser irradiation. Electrochemical measurements show that the basal plane of 1T′-MoS2 is much more active than that of 2H-MoS2 for the electrocatalytic hydrogen evolution reaction in an acidic medium.

Original languageEnglish
Pages (from-to)638-643
Number of pages6
JournalNature Chemistry
Volume10
Issue number6
DOIs
Publication statusPublished - 1 Jun 2018
Externally publishedYes

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