Robust Covalent Organic Frameworks for Photosynthesis of HO: Advancements, Challenges and Strategies.

Since 2020, covalent organic frameworks (COFs) are emerging as robust catalysts for the photosynthesis of hydrogen peroxide (HO), benefiting from their distinct advantages. However, the current efficiency of HO production and solar-to-chemical energy conversion efficiency (SCC) remain suboptimal due to various constraints in the reaction mechanism. Therefore, there is an imperative to propose efficiency improvement strategies to accelerate the development of this reaction system. This comprehensive review delineates recent advances, challenges, and strategies in utilizing COFs for photocatalytic HO production. It explores the fundamentals and challenges (e.g., oxygen (O) mass transfer rate, O adsorption capacity, response to sunlight, electron-hole separation efficiency, charge transfer efficiency, selectivity, and HO desorption) associated with this process, as well as the advantages, applications, classification, and preparation strategies of COFs for this purpose. Various strategies to enhance the performance of COFs in HO production are highlighted. The review aims to stimulate further advancements in utilizing COFs for photocatalytic HO production and discusses potential prospects, challenges, and application areas in this field.