近日，湖北大学赵丽团队研究了三元硫化物/三嗪基COF S方案光催化剂：增强H₂O₂的产生和Fs-TA机理研究。2026年3月18日出版的《结构化学》杂志发表了这项成果。

通过结合三元硫化物与二维平面共价有机框架（COF）的优势构建异质结以延缓光生电子（e⁻）和空穴（h⁺）复合，是提升光催化性能的有效策略。

研究组采用自组装方法制备了具有S型异质结构的CdIn₂S₄/COF（CIS-COF）复合材料。CIS-COF复合材料融合了COF的宽光谱吸收与高比表面积特性，以及CIS的强导带（CB）还原能力，通过S型机制实现高效电荷分离。与纯CIS（4669.8 μmol g⁻¹ h⁻¹）和纯COF（1729.8 μmol g⁻¹ h⁻¹）相比，CIS-COF的过氧化氢（H₂O₂）产率显著提升至11889.4 μmol g⁻¹ h⁻¹。电子顺磁共振（EPR）分析表明超氧自由基和羟基自由基是主要活性物种。

通过原位光照X射线光电子能谱（XPS）、开尔文探针力显微镜（KPFM）和飞秒瞬态吸收光谱（fs-TA）阐明了界面电荷转移路径。紫外光电子能谱（UPS）验证了与S型构型一致的费米能级排列，为所提出的光催化机制提供了佐证。性能增强归因于异质结界面内建电场促进了定向电荷转移并抑制了复合。研究组凸显了COF在构建高效S型异质结中的关键作用，为高性能光催化H₂O₂制备中的光生载流子动力学提供了新见解。

附：英文原文

Title: Ternary sulfide/triazinyl COF Sscheme photocatalyst: Enhanced H2O2 production and FsTA mechanistic study

Author: anonymous

Issue&Volume: 2026-03-18

Abstract: The construction of heterojunctions to delay photogenerated electron (e) and hole (h+) recombination by integrating the advantages of ternary sulfides and two-dimensional (2D) planar covalent organic frameworks (COFs) is an effective strategy for enhancing photocatalytic performance. In this work, CdIn2S4/COF (CIS-COF) composites with an S-scheme heterostructures were fabricated via a self-assembly method. The CIS-COF composites combine the broad light absorption and high specific surface area of COFs with the strong conduction band (CB) reduction capability of CIS, leading to efficient charge separation through the S-scheme mechanism. Compared with pristine CIS (4669.8 μmol g1 h1) and COF (1729.8 μmol g1 h1), CIS-COF achieved a markedly higher hydrogen peroxide (H2O2) yield of 11889.4 μmol g1 h1. Electron paramagnetic resonance (EPR) analysis revealed that superoxide and hydroxyl radicals were the dominant reactive species. The interfacial charge transfer pathway was elucidated using in-situ light-illuminated X-ray photoelectron spectroscopy (XPS), Kelvin probe force microscopy (KPFM), and femtosecond transient absorption spectroscopy (fs-TA). Ultraviolet photoelectron spectroscopy (UPS) confirmed Fermi level alignments consistent with an S-scheme configuration, supporting the proposed photocatalytic mechanism. The enhanced performance is attributed to the built-in electric field at the heterojunction interface, which promotes directional charge transfer and suppresses recombination. This study highlights the crucial role of COFs in constructing efficient S-scheme heterostructures providing new insights into photogenerated carrier dynamics for high-performance photocatalytic H2O2 production.

DOI: 10.1016/j.cjsc.2026.100925

Source: https://cjsc.ac.cn/cms/issues/1022