内建电场与偶极场协同增强SnNb2O6/富氮C3N5 S型异质结光催化性能

doi:10.3866/PKU.WHXB202311016

Abstract

Abstract:

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.

Key words: SnNb₂O₆/C₃N₅, Internal electric field, Dipole field, Photocatalytic performance, Directional charge transfer

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 Phys. -Chim. Sin. 2024, 40(10), 2311016. doi: 10.3866/PKU.WHXB202311016

Figures/Tables 10

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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