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

Directional electron transfer is an appealing strategy for harnessing photogenerated charge separation kinetics. Herein, a novel 2D/1D SnNb 2 O 6 /nitrogen-enriched C 3 N 5 S-scheme heterojunction with strong internal electric field (IEF) and dipole field (DF) is designed through in situ growth of C 3 N 5 nanorods on SnNb 2 O 6 nanosheets . The IEF generated at the interface via the formation of the S-scheme heterojunction induces directional charge transfer from SnNb 2 O 6 to C 3 N 5 . Simultaneously, the DF within C 3 N 5 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 SnNb 2 O 6 /C 3 N 5 heterojunction demonstrates a remarkable H 2 production rate of 1090.0 μmol∙g −1 ∙h −1 with continuous release of H 2 bubbles. This performance surpasses that of SnNb 2 O 6 and C 3 N 5 by 38.8 and 10.7 times, respectively. Additionally, the SnNb 2 O 6 /C 3 N 5 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. The 2D/1D SnNb 2 O 6 /C 3 N 5 S-scheme heterojunction with strong internal electric field and dipole field were synthesized that exhibited outstanding photocatalytic performance.