Carbon dots-modulated covalent triazine frameworks with exceptionally rapid hydrogen peroxide production in water

[Display omitted] •Carbon dots significantly promote the formation of CTFs in liquid reaction system.•Carbon dots as hole acceptors help CTFs to fulfill dual-channel H2O2 production pathway.•Carbon dots allow H2O2 yield of CTFs to be enhanced by 22.6 folds.•Hole extraction efficiency of carbon dots...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-01, Vol.451, p.139035, Article 139035
Main Authors: Ren, Weijie, Chang, Qing, Li, Ning, Yang, Jinlong, Hu, Shengliang
Format: Article
Language:English
Subjects:
Carbon dots
Charge separation efficiency
Covalent triazine frameworks
Hydrogen peroxide production
Photocatalysis
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Summary:[Display omitted] •Carbon dots significantly promote the formation of CTFs in liquid reaction system.•Carbon dots as hole acceptors help CTFs to fulfill dual-channel H2O2 production pathway.•Carbon dots allow H2O2 yield of CTFs to be enhanced by 22.6 folds.•Hole extraction efficiency of carbon dots can be modulated by alkali metal ions. Carbon dots (CDs) are incorporated into the interlamination of covalent triazine frameworks (CTFs) for significantly enhanced photocatalytic H2O2 production. Benefiting from CDs-induced rapid nucleation and growth of CTFs on their surface, it can be realized to achieve 13.5-fold increase in hourly productivity and the unique nanoscale sandwich structures featuring excellent charge separation properties. The resultant photocatalyst allows both the oxygen reduction reaction and water oxidation reaction to generate H2O2 at the same time, exhibiting H2O2 yield exceeding the production rate of the pure CTFs 22.6 folds and a solar-to-chemical conversion efficiency of 0.16%. The experimental results reveal that CDs play multiple roles in CTFs, including timely extraction and storage of photoexcited holes and the creation of intermediate bands favoring long wavelength light absorption and utilization. Besides, CDs-induced surface polarization electric field in the interlamination of CTFs can be modulated by simply adsorbing alkali metal ions to further facilitate the carrier separation and migration. As thus, the promising H2O2 production efficiency is achieved.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2022.139035