Citation: Yuejiao An, Wenxuan Liu, Yanfeng Zhang, Jianjun Zhang, Zhansheng Lu. Revealing Photoinduced Charge Transfer Mechanism of SnO₂/BiOBr S-Scheme Heterostructure for CO₂ Photoreduction[J]. Acta Physico-Chimica Sinica, ;2024, 40(12): 240702. doi: 10.3866/PKU.WHXB202407021 shu

Revealing Photoinduced Charge Transfer Mechanism of SnO₂/BiOBr S-Scheme Heterostructure for CO₂ Photoreduction

1.
National Demonstration Center for Experimental Chemistry Education, Hebei Key Laboratory of Inorganic Nano-Materials, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China;
2.
School of Physics, Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration, Henan Normal University, Xinxiang 453007, Henan Province, China;
3.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China;
4.
School of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China

Corresponding author: Yanfeng Zhang, Jianjun Zhang, Zhansheng Lu,
Received Date: 23 July 2024
Revised Date: 21 August 2024
Accepted Date: 22 August 2024

Fund Project: This work was supported by National Natural Science Foundation of China (12274118, 52202375), Natural Science Foundation of Hebei of China (B2020205013, B2022205008), Science and Technology Project of Hebei Normal University of China (L2021K01), Innovation Capability Improvement Plan Project of Hebei Province (22567604H), Henan Center for Outstanding Overseas Scientists (GZS2023007), Special Project for Fundamental Research in University of Henan Province (22ZX013). The simulations were performed on resources provided by the High-Performance Computing Center of Henan Normal University.

S-scheme heterojunctions can preserve strong redox capacity on the basis of achieving spatial separation of photogenerated carriers. Therefore, a deep comprehension of the photoinduced charge transfer dynamics in S-scheme heterostructures is vital to enhancing photocatalytic properties. Herein, SnO₂/BiOBr S-scheme heterojunctions with tight contact are fabricated with in situ hydrothermal method. The optimal SnO₂/BiOBr exhibits excellent photocatalytic performance for CO₂ reduction, with yields of CO and CH₄ of 345.7 and 6.7 μmol∙g^-1∙h^-1, which are 5.6 and 3.7 times higher than those of the original BiOBr. The photoinduced charge transfer mechanism and dynamics of SnO₂/BiOBr S-scheme heterostructure are characterized by in situ X-ray photoelectron spectrum (XPS) and femtosecond transient absorption spectroscopy (fs-TA). A new fitted lifetime of photogenerated carriers are observed, which could be attributed to interfacial electron transfer of S-scheme heterojunction, further illustrating an ultrafast transfer channel for photoelectrons from SnO₂ conduction band to BiOBr valence band. As a result, the powerful reduced electrons in BiOBr conduction band and the powerful oxidation holes in SnO₂ valence band are retained. This work provides profound comprehension of photoinduced charge transfer mechanism of S-scheme heterojunction.
- SnO₂/BiOBr,
- CO₂ photoreduction,
- S-scheme heterojunction,
- fs-TA,
- in situ XPS
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Revealing Photoinduced Charge Transfer Mechanism of SnO2/BiOBr S-Scheme Heterostructure for CO2 Photoreduction

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Revealing Photoinduced Charge Transfer Mechanism of SnO₂/BiOBr S-Scheme Heterostructure for CO₂ Photoreduction