Metal-free photocatalytic reduction of CO2 on a covalent organic framework-based heterostructure
Photocatalytic reduction of CO2 with H2O is thought as an environment friendly approach for sus-tainable development.It is highly desirable but remains challenging to develop photocatalyst with metal-free site for CO2 reduction.Here,we fabricated a heterostructure by integrating azine-based COF with ZnIn2S4,where the azine unit in COF acts as metal-free sites for CO2 adsorption and reduc-tion.The as-formed interfused heterointerface in the heterostructure ensures the effective electron transfer from ZnIn2S4 across the interface to the COF,resulting in a spatial separation of redox sites for CO2 reduction and water oxidation.The hybrid catalyst exhibits remarkably enhanced photo-catalytic activity for CO2 reduction to CO,which is 8 and 6 times than the COF and ZnIn2S4,respec-tively,and is even comparable with some metal-catalyzed CO2 reduction systems.This study pro-vides a new paradigm to mimic natural photosynthesis by using metal-free site for CO2 reduction.
Covalent organic frameworkPhotocatalysisCO2 reductionHeterostructureMetal-free site
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