Journal
NATURE CHEMISTRY
Volume 10, Issue 6, Pages 638-643Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41557-018-0035-6
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Funding
- MOE under AcRF Tier 2 [ARC 19/15, MOE2014-T2-2-093, MOE2015-T2-2-057, MOE2016-T2-2-103]
- MOE under AcRF Tier 1 [2016-T1-001-147, 2016-T1-002-051]
- NTU in Singapore [M4081296.070.500000]
- Joint Research Fund for Overseas Chinese, Hong Kong and Macao Scholars [51528201]
- Singapore National Research Foundation via an NRF Investigatorship Award [NRF-NRFI2015-03]
- Singapore MOE AcRF Tier2 grant [MOE2015-T2-1-047]
- Singapore MOE AcRF Tier1 grant [RG 113/16]
- Singapore National Research Foundation under NRF RF award [NRF-RF2013-08]
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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.
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