Embedding Au nanoclusters into the pores of carboxylated COF for the efficient photocatalytic production of hydrogen peroxide

Au nanoclusters (Au NCs) have attracted extensive attention as visible light photosensitizers for photo-redox catalysis on various supports. However, retaining the photostability of Au NCs at the support interface under prolonged illumination is still a challenge. Herein, TCOF was synthesized as a p...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-10, Vol.11 (39), p.2119-21122
Main Authors: Shang, Qigao, Liu, Yanyang, Ai, Jing, Yan, Ying, Yang, Xiaofang, Wang, Dongsheng, Liao, Guiying
Format: Article
Language:English
Subjects:
Catalysis
Composite materials
Embedding
Hydrogen peroxide
Hydrogen production
Illumination
Nanoclusters
Photocatalysis
Pores
Quinoline
Separation
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Summary:Au nanoclusters (Au NCs) have attracted extensive attention as visible light photosensitizers for photo-redox catalysis on various supports. However, retaining the photostability of Au NCs at the support interface under prolonged illumination is still a challenge. Herein, TCOF was synthesized as a precursor, and COF-COOH with carboxy-quinoline in the pores was synthesized by post-modifying TCOF via the Doebner-Miller reaction. Meanwhile, the -COOH not only accelerated the separation and migration of photogenerated carriers, but also served as growth sites for the Au NCs, and the O-Au bond improved the stability of Au NCs under long-term illumination. More importantly, the photogenerated electrons of COF-COOH can rapidly migrate to the hot holes of Au NCs via COF-O-Au bridge bonds, which significantly improves the separation efficiency and utilization of photogenerated carriers, leading to the ultrahigh photocatalytic production of H 2 O 2 (18 933.58 μmol g −1 h −1 ). This work will provide a new strategy for the functionalization of COFs and the construction of composite photocatalysts. TCOF was modified with carboxy-quinoline in its pores as growth sites for gold NCs. Construction of an Au@COF photocatalyst is facilitated by COF-O-Au bonding bridges, resulting in increased charge-separation efficiency and excellent photocatalytic H 2 O 2 production under simulated solar irradiation.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta03966h