Abstract
The photosynthesis of hydrogen peroxide (H2O2), involving water oxidation and oxygen reduction, is crucial for optimizing light utilization. Here, a previously synthesized one-dimensional chain-like semiconductive uranyl coordination polymer (NDC-UCP) was used for the efficient overall photosynthetic reaction of H2O2 and its photocatalytic mechanism was systematically investigated. The excellent stability of NDC-UCP enables continuous H2O2 production for up to 96 h. Its unique hydrogen extraction capability enhances the photocatalytic performance, achieving a H2O2 production rate of 283.80 μmol g-1 h-1. Two mechanisms for H2O2 generation were revealed: efficient electron-hole separation in NDC-UCP facilitates a two-step one-electron oxygen reduction and direct water oxidation, while hydrogen abstraction of UO22+ generates hydroxyl (·OH) and hydroperoxyl radicals (HO2·), enhancing H2O2 photosynthesis. This study highlights the potential of uranyl coordination polymers in H2O2 production and their synergistic exciton dissociation and hydrogen abstraction functionalities in photocatalytic redox reactions.
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