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, Wei-Lin Dai, Bo Liu,
Received Date: 10 November 2023
Revised Date: 15 December 2023
Accepted Date: 18 December 2023

Fund Project: This work is supported by National Natural Science Foundation of China (22002102, 61904118, 62205231), Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX22_1555) and Jiangsu Key Laboratory for Environment Functional Materials.

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

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