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- W4386400631 abstract "The photocatalytic activity of covalent organic frameworks (COFs) to evolve hydrogen (H2) triggered by visible light has been promising, but the separation and migration efficiency of photogenerated electron-hole pairs still have to be improved. In the study, we designed and synthesized a kind of graphene quantum dots (GQDs) modified β-ketoenamine-linked COF composite (GQDs/COF) by an in-situ method to improve its photocatalytic H2 evolution for the first time. The resulting 0.44% GQDs/TpPa-1-COF shows a rate of H2 production of 487 μmol g−1h−1 with the illumination of visible light, outperforming those of bare TpPa-1-COF by 2.9 times. It is found that the GQDs serve as a photosensitizer that effectively enhances the optical absorption ability. Moreover, GQDs serve as a means of collecting photoinduced electrons as for preventing the subsequent recombination of carriers excited by visible light. Furthermore, the Ohmic contact effect between the TpPa-1-COF and GQDs facilitates the highly efficient migration of photoinduced electrons, which has been demonstrated by the density functional theory (DFT) calculation results. Overall, this work provides a novel strategy to design COF-based composites and gives some insight into the role of GQDs on enhanced photocatalytic activity." @default.
- W4386400631 created "2023-09-04" @default.
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- W4386400631 date "2023-12-01" @default.
- W4386400631 modified "2023-10-16" @default.
- W4386400631 title "Insight into the role of graphene quantum dots on the boosted photocatalytic H2 production performance of a covalent organic framework" @default.
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- W4386400631 doi "https://doi.org/10.1016/j.apsusc.2023.158383" @default.
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