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Sulfur Vacancy Induced High Performance of Photocatalytic H2 Production over 1T@2H Phase MoS2 Nanolayers

Abstract

MoS2 nanostructure has been widely studied as a co-catalyst for photocatalytic H2 production, but itself seldom studied as a photocatalytst. Herein we synthesized bicrystalline (1T embedded in 2H phase) MoS2 thin nanolayers with sulfur vacancy by a simple hydrothermal method. The ratio of 1T to 2H and the relative concentration of sulfur vacancy could be adjusted by changing Mo-precursor (Na2MoO4 and (NH4)2MoS4) and hydrothermal temperature. It was found that MoS2 nanolayers synthesized from (NH4)2MoS4 (i.e., MoS2(NMoS)) tended to form flower-shaped aggregates, while that from Na2MoO4 (i.e., MoS2(NaMo)) overlapped and went across with each to form a mesoporous structure. More interestingly, MoS2(NMoS) had a high relative content of 1T phase and sulfur vacancy than MoS2(NaMo). Thus, MoS2(NMoS) demonstrated two times higher H2 production rate than MoS2(NaMo), most likely resulted from the exposure of more active edge sites, the presence of more sulfur vacancy, the higher number of photo-excited electrons, and enhanced electron separation and transfer in MoS2(NMoS). MoS2(NMoS) also showed promising cycle performance for H2 production (20 cycles with 94% retention efficiency) and superior performance to reported MoS2 nanostructures. The important findings in this work could provide an alternative way to design a unique and efficient MoS2-based photocatalyst.

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Publication details

The article was received on 23 Jul 2017, accepted on 08 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01488K
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Sulfur Vacancy Induced High Performance of Photocatalytic H2 Production over 1T@2H Phase MoS2 Nanolayers

    Y. Liu, Y. Xie, L. Liu and J. Jiao, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01488K

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