Citation: Jiajie Cai, Chang Cheng, Bowen Liu, Jianjun Zhang, Chuanjia Jiang, Bei Cheng. CdS/DBTSO-BDTO S-scheme photocatalyst for H₂ production and its charge transfer dynamics[J]. Acta Physico-Chimica Sinica, ;2025, 41(8): 100084. doi: 10.1016/j.actphy.2025.100084 shu

CdS/DBTSO-BDTO S-scheme photocatalyst for H₂ production and its charge transfer dynamics

Jiajie Cai ¹ ,
Chang Cheng ² ,
Bowen Liu ¹ ,
Jianjun Zhang ^2,, ,
Chuanjia Jiang ^3,, ,
Bei Cheng ^1,,

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei Province, China
2.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China
3.
College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China

Corresponding author: Jianjun Zhang, zhangjianjun@cug.edu.cn Chuanjia Jiang, jiangcj@nankai.edu.cn Bei Cheng, chengbei2013@whut.edu.cn
Received Date: 20 February 2025
Revised Date: 10 March 2025
Accepted Date: 24 March 2025

Fund Project: the National Key Research and Development Program of China 2022YFB3803600the National Natural Science Foundation of China 22238009the National Natural Science Foundation of China 22361142704the National Natural Science Foundation of China 22261142666the National Natural Science Foundation of China 22278324the National Natural Science Foundation of China 52073223the Natural Science Foundation of Hubei Province of China 2022CFA001the Fundamental Research Funds for the Central Universities 63241632

Photocatalytic hydrogen (H₂) production is a clean energy technology, with great potential for addressing the global energy crisis and related environmental problems. However, single-component photocatalysts often suffer from low efficiency primarily due to fast charge carrier recombination and the tradeoff between light-absorbing capacity and redox capabilities. Constructing heterojunctions provides a promising strategy to overcome these drawbacks, and S-scheme heterojunctions have recently stood out, demonstrating the capability to efficiently facilitate electron/hole separation, while maximizing the redox capability. Among them, polymer-based S-scheme photocatalysts are emerging, though the charge carrier dynamics in inorganic-organic S-scheme heterojunctions remain to be elucidated. Herein, we fabricated an S-scheme heterojunction comprised of the conjugated polymer dibenzothiophene-S, S-dioxide-alt-benzodithiophene (DBTSO-BDTO) and cadmium sulfide (CdS) for photocatalytic H₂ production. The S-scheme mechanism was verified using in situ irradiated X-ray photoelectron spectroscopy, and the charge carrier transfer dynamics were analyzed in depth using femtosecond transient absorption spectroscopy, which revealed that a considerable fraction of electrons undergo interfacial charge transfer in the CdS/DBTSO-BDTO composite. Owing to the improved charge separation efficiency and redox capability, the performance of the composite surpassed that of DBTSO-BDTO and CdS, and the H₂ evolution rate of the optimized CdS/DBTSO-BDTO material reached 3313 μmol·h⁻¹·g⁻¹, three times that of pure CdS. The findings provide new insights into the electron transfer mechanisms of S-scheme heterojunctions, and can guide the design of polymer-based photocatalysts for solar fuel production.
- Photocatalysis,
- Cadmium sulfide,
- S-scheme heterojunction,
- H₂ production,
- Femtosecond transient absorption spectroscopy
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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

CdS/DBTSO-BDTO S-scheme photocatalyst for H2 production and its charge transfer dynamics

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通讯作者: 陈斌, bchen63@163.com

CdS/DBTSO-BDTO S-scheme photocatalyst for H₂ production and its charge transfer dynamics