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A Triformylphloroglucinol-based covalent organic polymer:Synthesis,Characterization and Its Application in Visible-light-driven Oxidative Coupling Reactions of Primary Amines

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Chemical Research in Chinese Universities 2020年第6期36卷 1017-1023页

作者： LI Xiaodong SU Qing LIU Ziqian LUO Kexin LI Guanghua WU Qiaolin College of Chemistry Jilin UniversityChangchun 130012P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130012P.R.China

A triformylphloroglucinol-based AiB2-typed covalent organic polymer(TFG-BPTH)was successfully constructed by the condensation reaction of triformylphloroglucinol(TFG)and 2.5-bis(2-propynyloxy)terephthalo-hydrazide(BPTH)under solvothermal conditions.The structure of the TFG-BPTH was confirmed by spectra tech-niques including FTIR and solid-state IC CP/MAS NMR spectroscopy.The mophological features of TFG-BPTH were analyzed using scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The TFG-BPTH possessed good thermal and chemical stability,and exhibited good photocatalytic activity as a metal-free heterogeneous catalyst for oxidation of amines to valuable imines under visible light irradiation using O2 as greer oxidant.In addition,the catalyst could be readily recovered from the reaction mixture by simple filtration and reused for at least five cycles without any observable change in structure and catalytic activity.

关键词： covalent organic polymer Condensation reaction Oxidation of amine Photocatalysis Heterogeneous catalysis

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d-Orbital steered FeN_(4)moiety through N,S dual-site adjustation for zinc-air flow battery

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Journal of Energy Chemistry 2024年第5期92卷 8-15页

作者： Chunzhu Bao Mingwei Tong Xueli Li Zhonghua Xiang State Key Laboratory of organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The implementation of pristine covalent organic polymer(CO_(2)P)with well-defined structure as air electrode may spark fresh vitality to rechargeable zinc-air flow batteries(ZAFBs),but it still remains challenges in synergistically regulating their electronic states and structural porosity for the great device performance.Here,we conquer these issues by exploiting N and S co-doped graphene with COP rich in metal-ligand nitrogen to synergistically construct an effective catalyst for oxygen reduction reaction(ORR).Among them,the N and S co-doped sites with high electronegativity properties alter the number of electron occupations in the d orbital of the iron centre and form electron-transfer bridges,thereby boosting the selectivity of the ORR-catalysed four-electron pathway.Meanwhile,the introduction of COP materials aids the formation of pore interstices in the graphene lamellae,which both adequately expose the active sites and facilitate the transport of reactive substances.Benefiting from the synergistic effect,as-prepared catalyst exhibits excellent half-wave potentials(E_(1/2)=912 mV)and stability(merely 8.8%drop after a long-term durability test of 50000 s).Further,ZAFBs assembled with the N/SG@CO_(2)P catalyst demonstrate exceptional power density(163.8 mW cm^(-2))and continuous charge and discharge for approximately 140 h at 10 mA cm^(-2),outperforming the noble-metal benchmarks.

关键词： Nitrogen/sulfurdual sites Metal-coordinated nitrogen sites covalent organic polymer Oxygen reduction reaction Zn-airflow battery

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