Halogen‐Modulated 2D Coordination Polymers for Efficient Hydrogen Peroxide Photosynthesis under Air and Pure Water Conditions

Abstract H 2 O 2 is a widely used eco‐friendly oxidant and a potential energy carrier. Photocatalytic H 2 O 2 production from water and O 2 is an ideal approach with the potential to address the current energy crisis and environmental issues. Three zig‐zag two‐dimensional coordination polymers (2D CPs), named CuX‐dptz, were synthesized by a rapid and facile method at room temperature, showing preeminent H 2 O 2 photoproduction performance under pure water and open air without any additives. CuBr‐dptz exhibits a H 2 O 2 production rate high up to 1874 μmol g −1 h −1 , exceeding most reported photocatalysts under this condition, even comparable to those supported by sacrificial agents and O 2 . The coordination environment of Cu can be modulated by halogen atoms (X=Cl, Br, I), which in turn affects the electron transfer process and finally determines the reaction activity. This is the first time that 2D CPs have been used for photocatalytic H 2 O 2 production in such challenging conditions, which provides a new pathway for the development of portable in situ H 2 O 2 photosynthesis devices.