Covalent Organic Framework Membranes with Asymmetric Wettability for Efficient Photocatalytic H2O2 Synthesis.

Abstract

Photocatalytic H2O2 synthesis from air and water is a sustainable route but hindered by mass transport and charge separation issues. Here, covalent organic framework (COF) membranes with asymmetric wettability are developed to construct triphase interfaces, locally enriching O2 and H2O for efficient reactions. Converting COF powders into nanostructured membranes enhances light absorption and band alignment, promoting water oxidation and charge separation. These synergistic effects boost H2O2 production to 52.5 mmol g-1 h-1 under O2, with an apparent quantum yield 27.8 times higher than powders, and up to 148.9-fold under air. The flexible membranes can be integrated into reactors, and the in situ generated H2O2 enables pollutant degradation. This work demonstrates a versatile strategy for high-performance triphase photocatalysis and multifunctional membrane catalysts toward sustainable chemical synthesis.