S‐Scheme Heterojunction Fabricated from Covalent Organic Framework and Quantum Dot for Enhanced Photosynthesis of Hydrogen Peroxide from Water and Air

作者：Xiaolin Ma, Senzhi Li, Ying Gao, Ning Li, Yuesheng Han, Houhe Pan, Yongzhong Bian, Jianzhuang Jiang · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202409913 · 被引用次数：108 · 研究领域：Covalent Organic Framework Applications、Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors

Abstract Covalent organic frameworks (COFs) with stable crystalline porous structures and flexible assembly properties contribute to the direct photocatalytic synthesis of H2O2 to meet the growing global demand. To address the challenges of insufficient redox capacity and photogenerated carrier recombination of COFs, S‐scheme heterojunction is constructed from COFs with quantum dots (QDs) to improve the photocatalytic production of H2O2. Herein, 0D ZnCdS QDs (ZCS) uniformly anchor on the surface of a 2D conjugated tetrathiafulvalene‐based COF (TT‐COF), affording the S‐scheme heterojunction TT‐COF/ZCS. Formation of S‐scheme heterojunction effectively prevents the agglomeration of ZCS, modulates the energy band structure of TT‐COF, and enhances the migration of photogenerated carriers and redox ability. As a total consequence, the optimized heterojunction (TZ‐40) is able to afford H2O2 in the yield up to 5171 µmol g−1 h−1 under visible light irradiation with H2O and O2, much higher than those for TT‐COF, 2520 µmol g−1 h−1, and ZCS, 2647 µmol g−1 h−1. The present result demonstrates the great potential of COFs/QDs‐based S‐scheme heterojunctions for photocatalytic applications including photocatalytic H2O2 production.