Graphdiyne (CnH2n-2) as an “electron transfer bridge” boosting photocatalytic hydrogen evolution over Zn0.5Co0.5S/MoS2 S-scheme heterojunction

In the process of photocatalytic water cracking, the migration rate and utilization rate of photogenerated charges determine the hydrogen evolution performance of the catalyst. In this paper, a carbon isotope superconducting material graphdiyne (GDY) is prepared by mechanical ball milling and introd...

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Bibliographic Details
Published in:Rare metals 2024-05, Vol.43 (5), p.1999-2014
Main Authors: Li, Mei, Wang, Jing-Zhi, Jin, Zhi-Liang
Format: Article
Language:English
Subjects:
Ball milling
Biomaterials
Carbon isotopes
Catalysts
Chemistry and Materials Science
Electron transfer
Energy
Heterojunctions
Hydrogen
Hydrogen evolution
Materials Engineering
Materials Science
Metallic Materials
Molybdenum disulfide
Movable bridges
Nanoscale Science and Technology
Original Article
Photocatalysis
Photoelectrons
Physical Chemistry
Triethanolamine
Utilization
X ray photoelectron spectroscopy
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Summary:In the process of photocatalytic water cracking, the migration rate and utilization rate of photogenerated charges determine the hydrogen evolution performance of the catalyst. In this paper, a carbon isotope superconducting material graphdiyne (GDY) is prepared by mechanical ball milling and introduced into the S-scheme heterojunction Zn 0.5 Co 0.5 S/MoS 2 inorganic system. In terms of hydrogen evolution kinetics, GDY acts as an electron bridge, not only accelerating the migration of photogenerated carriers but also improving the utilization of photogenerated charges. Morphologically, the large two-dimensional layer provides more loading and anchoring points for Zn 0.5 Co 0.5 S/MoS 2 , which increases the number of active sites. The ternary composite catalyst 20%GDY/Zn 0.5 Co 0.5 S/Mo 2 S (20-GCSM) generates 69.94 μmol of hydrogen (5 h) in triethanolamine solution. It is 2.97 and 1.80 times higher than Zn 0.5 Co 0.5 S and Zn 0.5 Co 0.5 S/MoS 2 , respectively. After the cyclic experiment, it still has stable hydrogen evolution performance after standing for 24 h (under dark conditions). In addition, the potential mechanism of photocatalytic hydrogen evolution is demonstrated through in-situ X-ray photoelectron spectroscopy. This work provides a reference for further research in the field of introducing carbon materials into photocatalytic systems and improving the utilization of photogenerated charges. Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-023-02539-y