范德华S型异质结赋予快速电荷转移助力光催化活性提升

doi:10.1016/j.actphy.2025.100211

Abstract

Abstract:

The rational design of efficient step-scheme (S-scheme) heterojunctions is a significant breakthrough in photocatalysis, holding great potential to enhance eco-friendly environmental restoration and energy conversion technologies. However, conventional S-scheme heterojunctions frequently suffer from lattice mismatch issues, which severely compromise the efficacy of built-in electric fields in charge separation. To address this limitation, we developed an innovative in situ deposition strategy to construct van der Waals S-scheme heterojunctions within Bi₂O₂S-BiOBr composites. This approach effectively mitigates lattice mismatch and ensures intimate interfacial contact, enabling the formation of a strong internal electric field that facilitates efficient carrier migration. The Bi₂O₂S-BiOBr composites exhibit an extended light absorption range exceeding 700 nm, allowing for broad-spectrum photocatalytic activity. Under Xenon lamp irradiation, the Bi₂O₂S-BiOBr composites demonstrated outstanding photocatalytic efficiency in the degradation of ciprofloxacin (CIP). Notably, the 20%Bi₂O₂S-BiOBr composite achieved 93% CIP removal within 15 min, outperforming all other tested composites. The notable enhancement in performance stems from the van der Waals S-scheme heterojunction, which facilitates highly efficient separation of photogenerated carriers. This work provides valuable insights for the strategic design of advanced van der Waals heterostructures with S-scheme charge transfer mechanisms.

Key words: S-scheme heterojunction, Van der Waals, Photocatalytic degradation, Charge separation, Bi₂O₂S-BiOBr composite

Kaiqiang Xu, Jia Yu, Wei Xia, Jianjun Zhang, Sheng Han. Rapid charge transfer endowed by van der Waals S-scheme heterojunction for boosting photocatalytic activity[J]. Acta Phys. -Chim. Sin. 2026, 42(7), 100211. doi: 10.1016/j.actphy.2025.100211

Figures/Tables 12

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Heterojunction photocatalyst	CIP (mg L⁻¹)	Removal rate	Ref.
BiOBr/Bi₂MoO₆	10	94% at 120 min	[70]
MnO₂/BiOBr	20	77.3% at 60 min	[71]
WS₂/BiOBr	20	92% at 100 min	[72]
CN QDs/BiOBr	10	70% at 90 min	[73]
BiOBr/Bi₂WO₆	10	90% at 120 min	[74]
BiOBr/Cu₂S	10	79.2% at 90 min	[55]
Ni-MOF/BiOBr	20	92.8% at 120 min	[75]
Bi₂O₂CO₃/BiOBr	10	96% at 120 min	[76]
PDI/BiOBr	20	85.3% at 90 min	[77]
Bi₂O₂S/BiOBr	20	93% at 15 min	This work

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Rapid charge transfer endowed by van der Waals S-scheme heterojunction for boosting photocatalytic activity

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