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Engineering MoS2 nanostructures from various MoO3 precursors towards hydrogen evolution reaction

Abstract

MoS2-based nanomaterials could be considered to be the promising effective electrocatalysts to replace precious metal catalysts toward hydrogen evolution reaction. However, the understanding on the effect of MoO2 in MoS2-based catalysts for hydrogen evolution reaction is ambiguous. In this paper, MoS2 nanoflowers with 210-430 nm in diameter were hydrothermally synthetheized by the reduction of α-MoO3 particles with KSCN in hydrochloric acidic medium. Similarly, MoO2-MoS2-B nanoflowers and MoO2-MoS2-R nanoflowers were fabricated using α-MoO3 nanobelts and h-MoO3 microrods as Mo sources, respectively. Systematic studies on synthetic parameters verified that it favored the formation of MoS2 nanoflowers with the high acitidy, low MoO3/KSCN ratio and high temperature. The resultant nanoflowers serverd as electrocatalysts to drive hydrogen evolution in acidic solution. The MoS2 nanoflowers showed a relatively higher activity with the potential of 256 mV at 10 mA/cm2 than that of MoO2-MoS2-B nanoflowers (283 mV) and MoO2-MoS2-R nanoflowers (305 mV). Furthermore, MoS2 nanoflowers catalyts maintained the high stability after 1000 cycles and long-term durability for 5 h. The high catalytic activity could be ascribed to the large exposure of the Mo-S species and small amounts of Mo-O species on MoS2-based catalysts surface.

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Supplementary files

Article information


Submitted
01 Dec 2019
Accepted
02 Feb 2020
First published
11 Feb 2020

CrystEngComm, 2020, Accepted Manuscript
Article type
Paper

Engineering MoS2 nanostructures from various MoO3 precursors towards hydrogen evolution reaction

W. Wang, Q. Yao, J. Ma, Y. Xu, J. Jiang, X. Liu and Z. Li, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/C9CE01904A

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