期刊
CHEMICAL SCIENCE
卷 13, 期 29, 页码 8679-8685出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2sc02503e
关键词
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资金
- National Natural Science Foundation of China [21975078, 52073161, 52073089]
- Guangdong Basic and Applied Basic Research Foundationgs [2021A1515010311]
- Natural Science Foundation of Guangdong Province [2019B030301003]
- 111 Project [BP0618009]
- Thousand Youth Talents Plan
- China Scholarship Council [202006150059]
- Natural Science Foundation of Zhejiang Province [LZ20E030001]
- Tsinghua University-Zhangjiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology
In this work, phenothiazine-based covalent organic frameworks (COFs) with low binding energy excitons were successfully designed, and their photocatalytic properties were demonstrated by synthesizing high molecular weight polymers without using metal catalysts.
Designing delocalized excitons with low binding energy (E-b) in organic semiconductors is urgently required for efficient photochemistry because the excitons in most organic materials are localized with a high E-b of >300 meV. In this work, we report the achievement of a low E-b of similar to 50 meV by constructing phenothiazine-based covalent organic frameworks (COFs) with inherent crystallinity, porosity, chemical robustness, and feasibility of bandgap engineering. The low E-b facilitates effective exciton dissociation and thus promotes photocatalysis by using these COFs. As a demonstration, we subject these COFs to photocatalytic polymerization to synthesize polymers with remarkably high molecular weight without any requirement of the metal catalyst. Our results can facilitate the rational design of porous materials with low E-b for efficient photocatalysis.
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