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  Protonated imine-linked covalent organic frameworks for photocatalytic hydrogen evolution

Yang, J., Acharjya, A., Ye, M.-Y., Rabeah, J., Li, S., Kochovski, Z., et al. (2021). Protonated imine-linked covalent organic frameworks for photocatalytic hydrogen evolution. Angewandte Chemie International Edition, 60(36), 19797-19803. doi:10.1002/anie.202104870.

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 Creators:
Yang, Jin, Author
Acharjya, Amitava, Author
Ye, Meng-Yang, Author
Rabeah, Jabor, Author
Li, Shuang, Author
Kochovski, Zdravko, Author
Youk, Sol1, Author              
Roeser, Jérôme, Author
Grüneberg, Julia, Author
Schwarze, Michael, Author
Wang, Tianyi, Author
Lu, Yan, Author
van de Krol, Roel, Author
Oschatz, Martin1, Author              
Schomäcker, Reinhard, Author
Saalfrank, Peter, Author
Thomas, Arne, Author
Penschke, Christopher, Author
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              

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Free keywords: covalent organic frameworks, COFs, imine, protonation, photocatalytic hydrogen evolution
 Abstract: Covalent organic frameworks (COFs) have emerged as an important class of organic semiconductors for the photocatalytic hydrogen evolution reaction (HER). When tuning the photocatalytic activity of COFs, efforts are typically invested on choosing the proper combination of linkers. However, the effect of the linkage on the photocatalytic performance has rarely been studied. Herein, we demonstrate that upon protonation of Schiff-base moieties, donor-acceptor (D-A) type imine-linked COFs can produce hydrogen with a rate as high as 20.7 mmol g-1 h-1 under visible light irradiation. A significant red shift in light absorbance, largely improved charge separation efficiency, as well as an increase in hydrophilicity triggered by protonation of the Schiff-base moieties in the imine-linked COFs, are responsible for the improved photocatalytic performance. The protonation phenomenon, which has not been investigated within the context of imine COFs photocatalytic HER before, arose as a key aspect to improve the photocatalytic performance. On the other hand, it is also instructive to broaden the application of COFs as semiconductors in light harvest and transformation, such as organic solar cells.

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Language(s): eng - English
 Dates: 2021-05-272021
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1002/anie.202104870
DOI: 10.1002/ange.202104870
BibTex Citekey: https://doi.org/10.1002/anie.202104870
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Title: Angewandte Chemie International Edition
  Abbreviation : Angew. Chem., Int. Ed.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 60 (36) Sequence Number: - Start / End Page: 19797 - 19803 Identifier: ISSN: 1433-7851

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Title: Angewandte Chemie
  Abbreviation : Angew. Chem.
Source Genre: Journal
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Affiliations:
Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 133 (36) Sequence Number: - Start / End Page: 19950 - 19956 Identifier: ISSN: 0044-8249