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Abstract:
MoS2/CQDs (CQDs stands for carbon quantum dots) with a mass ratio of MoS2/CQDs of 1:5 were obtained via photoreduction of (NH4)(2)MoS4 over irradiated CQDs in the presence of methanol as a sacrificial agent. Self-assembly of ZnIn2S4 microspheres on the surface of MoS2/CQDs was realized under microwave conditions to obtain ternary MoS2/CQDs/ZnIn2S4 microspheres. The ternary MoS2/CQDs/ZnIn2S4 nanocomposite shows significantly superior photocatalytic activity for hydrogen evolution to both MoS2/ZnIn2S4 and CQDs/ZnIn2S4, indicating the existence of a synergistic effect of MoS2 and CQDs in promoting the hydrogen evolution. It was proposed that the transfer of the photo-generated electrons from the semiconductor-based photocatalyst (ZnIn2S4) to the hydrogen evolution cocatalyst (MoS2) is promoted by CQDs acting as a mediator in the ternary MoS2/CQDs/ZnIn2S4 nanocomposite. An optimum performance was observed over a 3.0 wt% MoS2/CQDs/ZnIn2S4 nanocomposite in the presence of Na2S/Na2SO3 as a sacrificial agent, where 750 mol of hydrogen was evolved in 5 h. The optimum apparent quantum efficiency (AQE) was determined to be 25.6% at a wavelength of 420 nm, which is among the highest AQEs ever reported for ZnIn2S4-based systems. This study provides a strategy for developing highly efficient photocatalysts for hydrogen evolution via using CQDs as a bridge to promote charge transfer in nanocomposites.
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JOURNAL OF MATERIALS CHEMISTRY A
ISSN: 2050-7488
Year: 2018
Issue: 40
Volume: 6
Page: 19735-19742
1 0 . 7 3 3
JCR@2018
1 0 . 8 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:284
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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