Citation: You Wu, Chang Cheng, Kezhen Qi, Bei Cheng, Jianjun Zhang, Jiaguo Yu, Liuyang Zhang. Efficient Photocatalytic Production of H₂O₂ over ZnO/D-A Conjugated Polymer S-scheme Heterojunction and Charge Transfer Dynamics Investigation[J]. Acta Physico-Chimica Sinica, ;2024, 40(11): 240602. doi: 10.3866/PKU.WHXB202406027 shu

Efficient Photocatalytic Production of H₂O₂ over ZnO/D-A Conjugated Polymer S-scheme Heterojunction and Charge Transfer Dynamics Investigation

You Wu ^{1, 2} ,
Chang Cheng ² ,
Kezhen Qi ¹ ,
Bei Cheng ^2,, ,
Jianjun Zhang ^3,, ,
Jiaguo Yu ³ ,
Liuyang Zhang ³

1.
College of Pharmacy, Dali University, Dali 671000, Yunnan Province, China
2.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
3.
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China

Corresponding author: Bei Cheng, chengbei2013@whut.edu.cn Jianjun Zhang, zhangjianjun@cug.edu.cn
Received Date: 21 June 2024
Revised Date: 25 July 2024
Accepted Date: 26 July 2024
Available Online: 31 July 2024
Fund Project: Yunnan Provincial Science and Technology Plan Project 202305AF150116the National Natural Science Foundation of China 22238009the National Natural Science Foundation of China U23A20102the National Natural Science Foundation of China 52073223the National Natural Science Foundation of China 22278324the National Natural Science Foundation of China 22361142704the Natural Science Foundation of Hubei Province of China 2022CFA001the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) CUG22061

Photocatalytic technology harnesses clean, non-polluting solar energy to synthesize hydrogen peroxide (H₂O₂). In this study, ZnO/PBD S-scheme heterojunction composites, featuring ZnO nanoparticles on a donor-acceptor conjugated polymer substrate (PBD), were synthesized via the Suzuki-Miyaura reaction and hydrothermal method. The optimal ZnO/PBD composite achieved an H₂O₂ production efficiency of 4.07 mmol·g^-1·h^-1, which is 5.4 times higher than that of pristine ZnO. This significant enhancement is attributed to the formation of S-scheme heterojunctions. The successful construction of S-scheme heterojunctions was confirmed through UV-visible absorption spectroscopy and in situ irradiated X-ray photoelectron spectroscopy. Steady-state photoluminescence and femtosecond transient absorption (fs-TA) spectroscopies identified and verified the presence of defect states in ZnO. These defect states trap photogenerated electrons, adversely affecting the photocatalytic reaction. However, the S-scheme heterojunction effectively promotes the separation and transfer of electrons, mitigating this issue. The measured lifetimes of photogenerated electrons in these defect states, as determined by fitted fs-TA decay kinetics, provided further evidence of the carrier transfer mechanism in S-scheme heterojunctions. This work introduces a novel approach for studying organic/inorganic S-scheme heterojunctions using fs-TA spectroscopy.
- Photocatalytic production of H₂O₂,
- S-scheme heterojunction,
- ZnO defect states,
- fs-TA 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

Efficient Photocatalytic Production of H2O2 over ZnO/D-A Conjugated Polymer S-scheme Heterojunction and Charge Transfer Dynamics Investigation

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通讯作者: 陈斌, bchen63@163.com

Efficient Photocatalytic Production of H₂O₂ over ZnO/D-A Conjugated Polymer S-scheme Heterojunction and Charge Transfer Dynamics Investigation