| With the massive burning of fossil fuels and the decreasing reserves,the search for clean and sustainable alternative energy sources has become a serious problem facing the world today.Among the available renewable energy sources,solar energy is undoubtedly the most promising one.But solar energy is decentralized and requires a large number of collecting areas to collect meaningful energy.Covalent organic frameworks?COFs?are porous materials containing only light elements such as C,N,O and B.They have large?-conjugated systems and are potential photocatalysts.Hydrazone bond COFs are organic porous materials formed by dehydration and condensation of aldehyde and hydrazine.Because of its unique photoelectric properties,good absorptivity and physical and chemical stability,hydrazone bonded COFs are widely used in the field of photocatalysis.In this paper,we design and synthesize a hydrazine-linked COF?Ahn-Tp COF?,and explore its crystal structure with Material Studio.The combination of Ahn-Tp COF and molecular catalyst was applied to the photocatalytic reduction of CO2,and the mechanism of photocatalytic reduction was explored.The details are as follows:?1?A hydrazine-based COF?Ahn-Tp COF?with thermal stability and good optical absorptionwassuccessfullyconstructedbyusing1,8-neimidederivatives N-amino-4-hydrazine-1,8-neimide?Ahn?and 2,4,6-trimethylpyrogallol?Tp?,which have rigid planar structure,strong photochemical stability and thermal stability.Ahn-Tp COF can maintain the stability of its skeleton at 240?and has strong light absorption in the visible region.?2?Ir?tpy??ppy?Cl]+?PF6?-?[Ir-ppy]?was synthesized as a Co-Catalyzed to reduction of CO2 to CO with Ahn-Tp COF under visible light at?>420 nm was 2.32 times as much as that of TONs?19?catalyzed by[Ir-ppy]alone.Moreover,Ahn-Tp COF and[Ir-ppy]photocatalytically reduce CO2 through Z-type electron transfer mechanism.After adding Ahn-Tp COF,the catalytic activity of[Ir-ppy]increased significantly. |
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