Journal
APPLIED SURFACE SCIENCE
Volume 579, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.152224
Keywords
2D/2D heterojunction; S-scheme; Hydrogen; NiTe2; g-C3N4
Categories
Funding
- National Natural Science Foundation of China [22078261, 21676213, 11974276]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JM-422, 2021JQ-440]
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This study achieved efficient H-2 evolution by constructing an S-scheme heterojunction, which accelerates the migration of photogenerated carriers and enhances the redox ability to improve catalytic activity.
Rapid separation of charge carriers and fast kinetics of surface reaction are two essential prerequisites to achieve the efficient H-2 evolution from photocatalytic water splitting. In this work, a 2D/2D S-scheme NiTe2/g-C3N4 heterojunction was constructed by an in-situ deposition strategy using g-C3N4 nanosheets as substrate. The optimal composite exhibited a H-2 evolution rate of 2540.4 mu mol.g(-1).h(-1), which was 23.4 and 17.8 times higher than that of pristine g-C3N4 and NiTe2, respectively. Investigation indicates that the 2D contact interface and the built-in electric field between g-C3N4 and NiTe2 can accelerate the migration of photogenerated carriers, simultaneously, S-scheme charge transfer route endows the reserved electrons and holes with strong redox ability. What's more, the hydrophilicity of catalyst surface is remarkably improved after acid treatment, the H-2 evolution rate can be boosted to 12902.9 mu mol.g(-1).h(-1). This work provides a new application of telluride and an effective method to enhance the H-2 evolution activity of the catalysts.
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