催化学报 ›› 2026, Vol. 83: 271-281.DOI: 10.1016/S1872-2067(25)64925-4

• 论文 • 上一篇    下一篇

苯并三噻吩基共价有机框架连接结构调控实现高效光合成H2O2

谢可慧a,1, 刘从学b,1, 耿琰a,*(), 阚京兰a, 王广博a,*(), 董育斌a   

  1. a山东师范大学化学化工与材料科学学院, 山东省高校化学成像功能探针协同创新中心, 分子与纳米探针教育部重点实验室, 山东济南 250014
    b北京大学深圳研究生院, 新材料学院, 广东深圳 518055
  • 收稿日期:2025-08-08 接受日期:2025-10-19 出版日期:2026-04-18 发布日期:2026-03-04
  • 通讯作者: * 电子信箱: guangbo.wang@sdnu.edu.cn (王广博), gengyan@sdnu.edu.cn (耿琰).
  • 作者简介:1共同第一作者.
  • 基金资助:
    国家自然科学基金(22371172);国家自然科学基金(22171169);山东省泰山学者攀登计划;山东省自然科学基金(ZR2024MB119);山东省自然科学基金(ZR2024MB161);山东省高等学校青创团队计划(2023KJ194)

Efficient H2O2 photosynthesis through linker engineering of benzotrithiophene-based covalent organic frameworks

Ke-Hui Xiea,1, Cong-Xue Liub,1, Yan Genga,*(), Jing-Lan Kana, Guang-Bo Wanga,*(), Yu-Bin Donga   

  1. aCollege of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, Shandong, China
    bSchool of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, Guangdong, China
  • Received:2025-08-08 Accepted:2025-10-19 Online:2026-04-18 Published:2026-03-04
  • Contact: * E-mail: guangbo.wang@sdnu.edu.cn (G.-B. Wang), gengyan@sdnu.edu.cn (Y. Geng).
  • About author:1Contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(22371172);National Natural Science Foundation of China(22171169);Taishan Scholars Climbing Program of Shandong Province;Natural Science Foundation of Shandong Province(ZR2024MB119);Natural Science Foundation of Shandong Province(ZR2024MB161);Youth Innovation Science and Technology Program of Higher Education Institution of Shandong Province(2023KJ194)

摘要:

过氧化氢(H2O2)作为一种重要的基础化学品, 在消毒杀菌、工业漂白、生物医药和有机合成等领域具有广泛应用, 被列为全球100种最重要化学品之一. 目前工业上主要采用蒽醌法生产H2O2, 但该方法存在能耗高、工艺复杂和环境污染等问题. 因此, 在绿色温和条件下开发高效合成H2O2的新方法已成为催化领域的重要研究方向. 共价有机框架(COFs)是一类新兴晶态多孔材料, 因其结构可调、激子迁移率高以及能带可控等优势, 在光催化领域显现出巨大潜力. 在水相光催化体系中, 光生载流子的分离效率与材料的亲疏水性是影响光催化性能的两个关键因素, 如何实现二者的协同调控是当前面临的主要挑战. 本文提出通过在COFs构筑单元中引入不同亲疏水性官能团, 以同时实现材料电荷分离效率与亲疏水特性的精准调控, 从而实现高效光催化合成H2O2.
本研究通过引入羟基(-OH)、未修饰氢原子(-H)及氟原子(-F)三种不同性质的官能团, 设计合成了一系列具有相同网络拓扑结构的苯并三噻吩基COFs材料(分别为BTT-BD-OH-COF, BTT-BD-COF, BTT-BD-F-COF). 粉末X射线衍射和Materials Studio结构模拟表明, 所得COFs均为P6/M空间群的AA堆积结构. 傅里叶变换红外光谱、固体13C核磁共振以及X射线光电子能谱结果共同证实了亚胺键的成功构建; 水接触角测试结果表明, -OH官能团的引入可以显著提升材料的亲水性(接触角≈16.5°), 而-F官能团则显著增强材料疏水性(接触角≈134.1°). 光电化学测试结果表明, BTT-BD-OH-COF具有更窄的光学带隙, 更宽的可见光吸收范围和更高的光生载流子分离效率. 光催化合成H2O2的性能测试中, BTT-BD-OH-COF表现出卓越的催化活性, 其在纯水中的H2O2生成速率高达6105 μmol g-1 h-1, 显著优于其它两种材料, 且表现出良好的循环稳定性与结构稳定性. 为深入探究其反应机制, 通过同位素标记实验和密度泛函理论(DFT)计算, 系统分析了H2O2的生成路径, 结果表明, H2O2的合成主要通过氧气还原反应(ORR)和水氧化反应(WOR)两条路径协同进行. 在ORR路径中, 三种COFs均遵循两步1e-过程, 光生电子与O2还原为O2-, 进而转化为H2O2; 在WOR路径中, BTT-BD-OH-COF和BTT-BD-COF遵循2e-路径直接将H2O氧化为H2O2, 而BTT-BD-F-COF则倾向于通过4e-路径生成O2, 再经过ORR过程转化为H2O2. DFT计算表明, BTT-BD-OH-COF在ORR路径的关键步骤(*OOH中间体生成)和WOR路径的关键步骤(*OH中间体生成)中具有最低的吉布斯自由能, 这从热力学角度解释了其优异光催化活性的内在机制.
综上, 本文通过配体功能化策略同时实现了COFs材料亲疏水特性和光生载流子的协同调控,在纯水中实现了H2O2的高效光合成, 并阐明了反应机制, 为后续设计开发高效光合成H2O2催化体系提供了新的思路和理论依据.

关键词: 共价有机框架材料, 光催化, 过氧化氢, 连接结构调控, 苯并三噻吩

Abstract:

The photogenerated carrier separation efficiency and material wettability are of critical importance for aqueous-phase photocatalytic reactions, achieving both simultaneously poses a significant challenge owing to the inherent interdependencies and trade-offs involved. In this work, a series of isoreticular benzotrithiophene-based covalent organic frameworks (COFs) were successfully synthesized by incorporating diverse hydrophobic and hydrophilic functional groups (-OH, -F, -H) onto their skeletons, thereby modulating their characteristic charge separation and transport as well as their wettability, and systematically studied their photocatalytic H2O2 production performance in O2-saturated water under visible-light irradiation. Remarkably, the synthesized hydrophilic BTT-BD-OH-COF demonstrates the highest H2O2 production rate of 6105 μmol g-1 h-1 in the absence of any sacrificial agent in pure water, attributed to its extended light absorption range, improved hydrophilicity, and enhanced photo-induced charge separation and transport efficiency. Combined experimental results and the density functional theory calculations elucidate the reaction mechanism, revealing the overall H2O2 photosynthesis via both oxygen reduction reaction and water oxidation reaction dual pathways. This study demonstrates that functional-group-mediated linker engineering is a powerful approach for significantly enhancing the efficiency of COF-based photocatalysts.

Key words: Covalent organic frameworks, Photocatalysis, Hydrogen peroxide, Linker engineering, Benzotrithiophene