Volume 19, Issue 48 2304367
Research Article

The Linkage-Moderated Covalent Organic Frameworks with C=N and NN on Charge Transfer Kinetics Towards the Robust Photocatalytic Hydrogen Activity

Haiyang Wu

Haiyang Wu

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Xuan He

Corresponding Author

Xuan He

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

E-mail: [email protected]; [email protected]

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Xing Du

Xing Du

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Daheng Wang

Daheng Wang

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Weixin Li

Weixin Li

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Hui Chen

Hui Chen

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Wei Fang

Wei Fang

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

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Lei Zhao

Corresponding Author

Lei Zhao

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan, 430081 P. R. China

E-mail: [email protected]; [email protected]

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First published: 11 August 2023
Citations: 3

Abstract

Since the linkages structured in covalent organic frameworks (COFs) usually impact the charge transfer behavior during photocatalytic hydrogen evolution reaction (pc-HER), linkage dependence on charge transfer kinetics should be further claimed. Herein, COFs with N-based linkages and pyrene-based building nodes are constructed to enable us to obtain new clues about the charge transfer behavior and evolution tendency relevant to linkages at a molecular level for pc-HER. It is demonstrated that photo-excited electrons preferably move to the N sites in C=N linkage for pc-HER and are trapped around NN linkage as well. A high electron transfer rate does not point to high photocatalytic activity directly, while a small difference between the electron transfer rate and electron recombination rate ΔkCTCR predicts the inefficiency of charge transfer in Azod-COFs. Contrarily, large value of ΔkCTCR in the case of Benzd-COFs, demonstrats an unimpeded charge transfer process to result in boosted pc-HER rate (2027.3 µmol h−1 g−1). This work offers a prominent strategy for the reasonable design of efficient photocatalysts at the molecular level for structural regulation and achieves an efficient charge transfer process for the pc-HER process.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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