Journal
APPLIED SURFACE SCIENCE
Volume 576, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151870
Keywords
Photocatalyst; Hydrogen production; BiOBr/Bi2S3; X-ray absorption-spectra; Complex
Categories
Funding
- Taiwan Ministry of Science and Technology [MOST 108-2221-E-035-049-MY3, 108-2112-M-213-002-MY3, 110-2634-F-009-026]
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The preparation and performance of a composite photocatalyst consisting of the BiOBr/Bi2S3 heterojunction and a Cu complex were studied. The introduction of the Cu complex improved the efficiency of charge transport and H-2 production activity in the sacrificial agent solution.
A composite photocatalyst consisting of the BiOBr/Bi2S3 heterojunction and a Cu complex exhibited high H-2 production activity through an efficient transport of charge by redox couple Cu(II)/Cu(I) of the complex. BiOBr was prepared by a microwave solvothermal method. Then, the BiOBr/Bi2S3 composite was prepared as a heterojunction photocatalyst by an ion-exchange process. The copper complex was then introduced as a co-catalyst or a redox mediator. The morphology, crystal properties, optical properties, surface chemistry, photocurrent response, and photocatalytic activity of these BiOBr/Bi2S3/copper complex composites were investigated. The formation of a BiOBr/Bi2S3 heterojunction and the introduction of Cu complex improved the performance of the photocatalysts. For the first time, operando X-ray absorption spectra were recorded in situ to unveil the local interaction at the reactant-photocatalyst interface toward the photocatalysis reaction of BiOBr/Bi2S3-Cu complex photocatalyst in the sacrificial agent solution (Na2S, Na2SO3).
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