Citation: Qianqian Liu, Xing Du, Wanfei Li, Wei-Lin Dai, Bo Liu. Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance[J]. Acta Physico-Chimica Sinica, ;2024, 40(10): 231101. doi: 10.3866/PKU.WHXB202311016 shu

Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance

Qianqian Liu ^{1, †,,} ,
Xing Du ^{1, †} ,
Wanfei Li ^{1, 2} ,
Wei-Lin Dai ^3,, ,
Bo Liu ^1,,

1.
Suzhou Key Laboratory for Nanophotonic and Nanoelectronic Materials and Its Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu Province, China
2.
Gusu Lab Mat, Suzhou 215123, Jiangsu Province, China
3.
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China

Corresponding author: Qianqian Liu, liuqianqian@usts.edu.cn Wei-Lin Dai, wldai@fudan.edu.cn Bo Liu, liubo@mail.usts.edu.cn
Received Date: 10 November 2023
Revised Date: 15 December 2023
Accepted Date: 18 December 2023
Available Online: 2 January 2024
Fund Project: National Natural Science Foundation of China 22002102National Natural Science Foundation of China 61904118National Natural Science Foundation of China 62205231Postgraduate Research & Practice Innovation Program of Jiangsu Province SJCX22_1555

Directional electron transfer is an appealing strategy for harnessing photogenerated charge separation kinetics. Herein, a novel 2D/1D SnNb₂O₆/nitrogen-enriched C₃N₅ S-scheme heterojunction with strong internal electric field (IEF) and dipole field (DF) is designed through in situ growth of C₃N₅ nanorods on SnNb₂O₆ nanosheets. The IEF generated at the interface via the formation of the S-scheme heterojunction induces directional charge transfer from SnNb₂O₆ to C₃N₅. Simultaneously, the DF within C₃N₅ provides the impetus to guide photo-excited electrons to the active sites. Consequently, the synergistic effects of IEF and DF facilitate swift directional electron transfer. The optimized SnNb₂O₆/C₃N₅ heterojunction demonstrates a remarkable H₂ production rate of 1090.0 μmol∙g⁻¹∙h⁻¹ with continuous release of H₂ bubbles. This performance surpasses that of SnNb₂O₆ and C₃N₅ by 38.8 and 10.7 times, respectively. Additionally, the SnNb₂O₆/C₃N₅ heterojunction exhibits superior activity in the removal of Rhodamine B, tetracycline, and Cr(Ⅵ). Based on electron paramagnetic resonance (EPR), time-resolved photoluminescence (TPRL) and density functional theory (DFT) calculations, etc., the directional charge transfer mechanism was systematically explored. The research furnishes a plausible approach to construct effective heterojunction photocatalysts for applications in energy and environmental domains.
- SnNb₂O₆/C₃N₅,
- Internal electric field,
- Dipole field,
- Photocatalytic performance,
- Directional charge transfer
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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

Synergistic Effects of Internal Electric and Dipole Fields in SnNb2O6/Nitrogen-Enriched C3N5 S-Scheme Heterojunction for Boosting Photocatalytic Performance

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通讯作者: 陈斌, bchen63@163.com

Synergistic Effects of Internal Electric and Dipole Fields in SnNb₂O₆/Nitrogen-Enriched C₃N₅ S-Scheme Heterojunction for Boosting Photocatalytic Performance