物理化学学报 >> 2026, Vol. 42 >> Issue (7): 100211.doi: 10.1016/j.actphy.2025.100211

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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

许凯强1, 于佳1, 夏伟2, 张建军2,*(), 韩生1,*()   

  1. 1 上海应用技术大学化学与环境工程学院, 上海 201418
    2 中国地质大学(武汉)材料与化学学院太阳燃料实验室, 湖北 武汉 430078
  • 收稿日期:2025-09-30 修回日期:2025-10-21 录用日期:2025-10-22 发布日期:2026-05-22
  • 通讯作者: Email: zhangjianjun@cug.edu.cn (张建军)hansheng654321@sina.com (韩生)

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

Kaiqiang Xu1, Jia Yu1, Wei Xia2, Jianjun Zhang2,*(), Sheng Han1,*()   

  1. 1 School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
    2 Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Province, China
  • Received:2025-09-30 Revised:2025-10-21 Accepted:2025-10-22 Published:2026-05-22
  • Contact: Email: zhangjianjun@cug.edu.cn (Jianjun Zhang)hansheng654321@sina.com (Sheng Han)

摘要:

合理设计高效梯型(S型)异质结已成为当前光催化领域的一项重要突破,在推动环境友好型生态修复与能源转化技术的发展方面具有巨大潜力。然而,传统S型异质结普遍存在晶格失配问题,导致界面内建电场削弱,从而限制了光生载流子的有效分离。为克服这一瓶颈,本研究提出了一种创新的原位沉积策略,在Bi2O2S-BiOBr复合体系中成功构建了范德华S型异质结。该策略有效缓解了晶格失配,实现了紧密的界面结合,从而形成强效内建电场,显著促进了载流子的高效迁移与分离。Bi2O2S-BiOBr复合材料光吸收范围超过700 nm,并在氙灯照射下对环丙沙星(CIP)展现出优异的光催化降解性能。其中,20%Bi2O2S-BiOBr在15 min内即可实现93%的CIP去除率,显著优于所有对比样品。这种显著的性能提升源于范德华S型异质结中光生载流子高效分离与传输效率。本研究为范德华S型异质结的理性设计提供了新的思路与理论支撑。

关键词: S型异质结, 范德华力, 光催化降解, 电荷分离, Bi2O2S-BiOBr复合材料

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