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

Abstract Covalent organic frameworks (COFs) with stable crystalline porous structures and flexible assembly properties contribute to the direct photocatalytic synthesis of H 2 O 2 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 H 2 O 2 . 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 H 2 O 2 in the yield up to 5171 µmol g −1 h −1 under visible light irradiation with H 2 O and O 2 , 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 H 2 O 2 production.