Synergistic Effects of Internal Electric and Dipole Fields in SnNb2O6/Nitrogen-Enriched C3N5 S-Scheme Heterojunction for Boosting Photocatalytic Performance
Qianqian Liu , Xing Du , Wanfei Li , Wei-Lin Dai , Bo Liu
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引用次数: 0
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.