Benzotrifuran‐Based Covalent Organic Frameworks for Artificial Photosynthesis of H <sub>2</sub> O <sub>2</sub> from H <sub>2</sub> O, O <sub>2</sub> , and Sunlight
Zhenwei Zhang, Yuxin Hou, Shanshan Zhu, Liuliu Yang, Yinghui Wang, Huijuan Yue, Hong Xia, Gang Wu, Hong Xia, Xiaoming Liu, Gang Wu, Shuo‐wang Yang, Xiaoming Liu
Abstract
Abstract Hydrogen peroxide (H 2 O 2 ) is an important green chemical and a potential energy carrier. Artificial photosynthesis of H 2 O 2 from only H 2 O and O 2 under sunlight is a fascinating and sustainable tactic. However, deficient proton sources come from the kinetically sluggish H 2 O oxidation process (∼s) seriously impede half‐reaction of O 2 reduction (µs∼ms), leading to inferior photocatalytic efficiency. Herein, we prepare a benzotrifuran‐based covalent organic framework featuring electron donor–acceptor character with hydrazone linkage. Spatially separated donor–acceptor π‐stacking columns offer rich O 2 reduction and H 2 O oxidation active sites, also serve as channels for photoinduced charge separation and transport. Importantly, the 1D pore containing abundant heteroatoms facilitates H 2 O delivery to oxidation sites and reduces reaction energy barrier, thus improving the kinetic of H 2 O oxidation. Accordingly, this porous framework achieves efficient H 2 O 2 photocatalysis with an average mass rate of up to 9800 µmol g −1 h −1 from H 2 O and O 2 in the absence of any sacrificial reagent under simulated sunlight by balancing O 2 reduction and H 2 O oxidation reactions.