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author:

Wang, Bingqing (Wang, Bingqing.) [1] | Deng, Zirong (Deng, Zirong.) [2] | Fu, Xianzhi (Fu, Xianzhi.) [3] (Scholars:付贤智) | Li, Zhaohui (Li, Zhaohui.) [4] (Scholars:李朝晖)

Indexed by:

EI Scopus SCIE

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.

Keyword:

Community:

  • [ 1 ] [Wang, Bingqing]Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Photocatalysis Energy & Environm, Coll Chem, Fuzhou 350116, Fujian, Peoples R China
  • [ 2 ] [Deng, Zirong]Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Photocatalysis Energy & Environm, Coll Chem, Fuzhou 350116, Fujian, Peoples R China
  • [ 3 ] [Fu, Xianzhi]Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Photocatalysis Energy & Environm, Coll Chem, Fuzhou 350116, Fujian, Peoples R China
  • [ 4 ] [Li, Zhaohui]Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Photocatalysis Energy & Environm, Coll Chem, Fuzhou 350116, Fujian, Peoples R China

Reprint 's Address:

  • 李朝晖

    [Li, Zhaohui]Fuzhou Univ, Res Inst Photocatalysis, State Key Lab Photocatalysis Energy & Environm, Coll Chem, Fuzhou 350116, Fujian, Peoples R China

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Source :

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:

WoS CC 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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