Inducing local charge polarization by constructing isomeric covalent organic frameworks with different orientations of imine bonds for enhancing photocatalytic hydrogen evolution
Literature Information
Huan He, Rongchen Shen, Peng Zhang, Guijie Liang, Xin Li
Imine-linked covalent organic frameworks (COFs) have garnered significant attention in photocatalysis due to their ease of synthesis and excellent crystallinity. However, there is still limited research on the influence of imine bond orientation on the processes of exciton dissociation and charge carrier separation in COFs. This study presents the synthesis and characterization of two novel COFs with distinct imine bond orientations. Experimental and theoretical investigations reveal that though the structures of these COFs are similar, their performance in exciton dissociation and electron–hole pair separation varies significantly. The orientation of the imine bond plays a crucial role in inducing local charge polarization and delocalization, thus influencing the efficiency of exciton dissociation and charge separation. Notably, the photocatalytic hydrogen-evolution activity for the COFs with the N-atom orientation in imine bond towards the acceptor is three times higher than that for COFs with the N-atom orientation in imine bond towards the donor. This study provides a clear design strategy for imine-linked COF-based photocatalysts and advances the development of COFs in photocatalysis.
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Journal of Materials Chemistry A

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment










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