首页|Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis

Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis

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Owing to the large exciton binding energy(＞100 meV)of most organic materials,the process of exciton dissociation into free electrons and holes is seriously hindered,which plays a key role in the photocat-alytic system.In this study,a series of chalcogen(S,Se)-substituted mesoporous covalent organic frame-works(COFs)have been synthesized for enhanced photocatalytic organic transformations.Photoelectro-chemical measurements indicate that the introduction of semi-metallic Se atom and the enlargement of conjugation degree can not only reduce the exciton binding energy accelerating the charge separation,but also reduce the band gap of COFs.As a result,the COF-NUST-36 with the lowest exciton binding energy(39.5 meV)shows the highest photocatalytic performance for selective oxidation of amines(up to 98％Conv.and 97.5％Sel.).This work provides a feasible method for designing COFs with high photocatalytic activity by adjusting exciton binding energy.

Covalent organic frameworksExciton binding energyAtom substitutionExtended conjugationPhotocatalysis

Zhangjie Gu、Zhen Shan、Yulan Wang、Jinjian Wang、Tongtong Liu、Xiaoming Li、Zhiyang Yu、Jian Su、Gen Zhang

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Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education,School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

State Key Laboratory of Photocatalysis on Energy and Environment,College of Chemistry,Fuzhou University,Fuzhou 350002,China

MIIT Key Laboratory of Advanced Display Material and Devices,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

Key Laboratory of Preclinical Study for New Drugs of Gansu Province,School of Basic Medical Sciences,Lanzhou University,Lanzhou 730000,China

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国家自然科学基金江苏省自然科学基金江苏省自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项Medical Innovation and Development Project of Lanzhou UniversityChinese Academy of Medical Sciences(CAMS)Innovation Fund for Medical SciencesChinese Academy of Medical Sciences(CAMS)Innovation Fund for Medical SciencesChinese Academy of Medical Sciences(CAMS)Innovation Fund for Medical SciencesStartup Funding from Nanjing University of Science and TechnologyStartup Funding from Nanjing University of Science and TechnologyThousand Young Talent Plan

22171136BK20220928BK202200793092101110230922010902lzuyxcx-2022-1562019-I2M-5-0742021-I2M-1-0262021-I2M-3-001AE89990AE89991/376

2024

10.1016/j.cclet.2023.108356

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(2)
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