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Catalysis Letters

, Volume 149, Issue 1, pp 34–48 | Cite as

Synergistic Enhancement of Hydrogen Production by ZIF-67 (Co) Derived Mo–Co–S Modified g-C3N4/rGO Photocatalyst

  • Yongke Zhang
  • Zhiliang JinEmail author
Article
  • 193 Downloads

Abstract

A novel and high active g-C3N4/rGO/Mo–Co–S is successfully prepared by a simple hydrothermal reaction and calcination with nitrogen in a tube furnace. Using thioacetamide as the sulfur source, ZIF-67 (Co) as the cobalt source, and sodium molybdate as the molybdenum source, the Mo–Co–S co-catalyst is successfully prepared by high-temperature hydrothermal reaction and one-step sulfidation. The g-C3N4/rGO nanosheets and the new Mo–Co–S co-catalyst provide a large space for dye adsorption and also provide more reactive sites for the reaction. It exhibits synergistic effect between g-C3N4, rGO and Mo–Co–S on very high efficient photocatalytic hydrogen production. Under light irradiation, the EY dye acts as a photosensitizer, which broadens the visible light absorption range and absorption intensity of the semiconductor and forms an effective separation of the photogenerated charge. As an electron donor, TEOA can be oxidized by holes, thereby consuming holes and improving the efficiency of charge separation. The maximum amount of hydrogen evolution reaches about 589 μmol for 5 h over the g-C3N4/rGO/Mo–Co–S photocatalyst under visible light irradiation, which is 23.5 times higher than that of the pure g-C3N4. The high photocurrent response, the faster electron-transfer rate constant (Ket = 1.36 × 109 s−1), the short fluorescence lifetime (0.33 ns) and the small Rs (19.46 Ω) and Ret (59.67 Ω) together accelerated the efficient spatial charges transfer, thereby increasing the photocatalytic activity of H2 production.

Graphical Abstract

Keywords

rGO g-C3N4 Mo–Co–S Synergistic effect Photocatalytic H2 production 

Notes

Acknowledgements

This work was financially supported by the Chinese National Natural Science Foundation (41663012, 21263001) and the innovation team project (YCX18082), North Minzu University.

Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringNorth Minzu UniversityYinchuanPeople’s Republic of China

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