Citation: Yi Yang, Xin Zhou, Miaoli Gu, Bei Cheng, Zhen Wu, Jianjun Zhang. Femtosecond transient absorption spectroscopy investigation on ultrafast electron transfer in S-scheme ZnO/CdIn₂S₄ photocatalyst for H₂O₂ production and benzylamine oxidation[J]. Acta Physico-Chimica Sinica, ;2025, 41(6): 100064. doi: 10.1016/j.actphy.2025.100064 shu

Femtosecond transient absorption spectroscopy investigation on ultrafast electron transfer in S-scheme ZnO/CdIn₂S₄ photocatalyst for H₂O₂ production and benzylamine oxidation

Yi Yang ^{1, 2} ,
Xin Zhou ³ ,
Miaoli Gu ² ,
Bei Cheng ² ,
Zhen Wu ^3,, ,
Jianjun Zhang ^4,,

1.
School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, Hubei Province, China
2.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei Province, China
3.
Department of Chemical Engineering, Ordos Institute of Technology, Ordos 017000, Inner Mongolia Autonomous Region, China
4.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China

Corresponding author: Zhen Wu, wuzhen@oit.edu.cn Jianjun Zhang, zhangjianjun@cug.edu.cn
Received Date: 22 January 2025
Revised Date: 12 February 2025
Accepted Date: 13 February 2025

Fund Project: National Natural Science Foundation of China 22278324National Natural Science Foundation of China 52202375National Natural Science Foundation of China 22469001the Science Foundation of Hubei Province of China 2022CFA001

Photocatalytic hydrogen peroxide (H₂O₂) production is a crucial process for clean energy conversion, involving the reduction of O₂ through two electrons. However, this process is often hampered by the sluggish water oxidation involving the photogenerated holes. To address this challenge, we have constructed a dual-functional S-scheme ZnO/CdIn₂S₄ heterojunction systerm coupling the H₂O₂ generation with a value-added benzylamine (BA) oxidation reaction. In this dual-functional photocatalytic system, photogenerated electrons in CdIn₂S₄ efficiently reduce O₂ to produce H₂O₂, while photogenerated holes in ZnO selectively oxidize BA to N-benzylidenebenzylamine. Leveraging the advantages of the S-scheme heterojunction, the optimized ZnO/CdIn₂S₄ photocatalyst displays an enhanced H₂O₂ production rate (386 μmol·L⁻¹·h⁻¹) and BA oxidation fraction (81%) than pure ZnO or CdIn₂S₄. Femtosecond transient absorption (fs-TA) spectroscopy confirm the ultrafast S-scheme electron transfer from the ZnO conduction band (CB) to the CdIn₂S₄ valence band (VB) upon photoexcitation of the ZnO/CdIn₂S₄ composite. Besides, timely depletion of VB holes in ZnO and CB electrons in CdIn₂S₄ can accelerate the interfacial electron transfer in the ZnO/CdIn₂S₄ S-scheme heterojunction. The innovative design of the ZnO/CdIn₂S₄ S-scheme photocatalyst provides new insights for developing efficient dual-functional heterojunction photocatalytic systems and introduces a novel method for studying S-scheme heterojunctions using fs-TA spectroscopy.
- Photocatalytic H₂O₂ production,
- S-scheme heterojunction,
- Selective benzylamine oxidation,
- fs-TA spectroscopy,
- Electron transfer dynamics
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Femtosecond transient absorption spectroscopy investigation on ultrafast electron transfer in S-scheme ZnO/CdIn2S4 photocatalyst for H2O2 production and benzylamine oxidation

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通讯作者: 陈斌, bchen63@163.com

Femtosecond transient absorption spectroscopy investigation on ultrafast electron transfer in S-scheme ZnO/CdIn₂S₄ photocatalyst for H₂O₂ production and benzylamine oxidation