Molybdenum disulfide quantum dots decorated bismuth sulfide as a superior noble-metal-free photocatalyst for hydrogen evolution through harnessing a broad solar spectrum

W. P.Cathie Lee, Xin Ying Kong, Lling Lling Tan, Meei Mei Gui, S. Sumathi, Siang Piao Chai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Molybdenum disulfide quantum dots (MoS 2 QDs) decorated bismuth sulfide (Bi 2 S 3 ) photocatalyst was synthesized. Photoluminescence characterization showed that the as-developed MoS 2 QDs possessed intriguing up-conversion and down-conversion properties, indicating their capability to harness energy from the light spectrum ranging from ultraviolet (UV) to near-infrared (NIR). In this study, the highest hydrogen yield of 17.7 mmol/g.h was achieved by 0.14MoS 2 QD/Bi 2 S 3 , which was almost 4.5 folds higher than that of undoped Bi 2 S 3 under stimulated solar light irradiation. Furthermore, examination of the 0.14MoS 2 QD/Bi 2 S 3 photocatalysts under NIR irradiation showed a significant photocurrent response and an accumulative H 2 yield of 53.6 μmol/g after 6 h reaction. This is a major breakthrough as most photocatalysts can only be activated under UV and/or visible light irradiation. This work provides new insights into the design of MoS 2 QD/Bi 2 S 3 for harnessing energy from a broad solar spectrum to photocatalytically split water to produce hydrogen.

Original languageEnglish
Pages (from-to)117-123
JournalApplied Catalysis B: Environmental
Volume232
DOIs
Publication statusPublished - 15 Sep 2018
Externally publishedYes

Keywords

  • Broad solar spectrum
  • Hydrogen
  • Molybdenum disulfide
  • Photocatalyst
  • Quantum dots

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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