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- W4281569151 abstract "Covalent-organic frameworks (COFs), assembled by covalent connection of organic molecules, have emerged as a new type of organic photocatalysts with porous and ordered structure, high surface area and excellent light absorption. In this work, we firstly report a class of COF based S-scheme heterojunction hybrids with oxygen vacancy (OVs) for efficient visible-light-driven hydrogen evolution. The black TiO2 (TiO2-x) was chosen to integrate with TpPa-1-COF to facilitate the efficient separation of photogenerated charges and enhance photocatalytic activity. The existence of oxygen defect was confirmed by electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS). Free radical trapping experiments confirmed the successful integration of COF based S-scheme heterojunction hybrids with oxygen defect. The results of H2 evolution experiments verify that H2 evolution rate of TiO2-x/TpPa-1-COF (6:4) reaches an optimum of 15.33 mmol·h−1·g−1 (with the TOF of 235.74 h−1), which is about 8 and 10.5 times that of pure TpPa-1-COF and TiO2-x, respectively. Moreover, it was demonstrated that TiO2-x/TpPa-1-COF also exhibited apparent higher H2 evolution activity (3.5 times) than that of TiO2/TpPa-1-COF (6:4) without oxygen defect in TiO2. Further investigations about photoelectric properties verify that S-scheme heterojunction with oxygen defect can better promote separation of photogenerated charges from COF in comparison with defect-less TiO2." @default.
- W4281569151 created "2022-05-27" @default.
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- W4281569151 date "2022-10-01" @default.
- W4281569151 modified "2023-10-10" @default.
- W4281569151 title "S-scheme heterojunction of black TiO2 and covalent-organic framework for enhanced photocatalytic hydrogen evolution" @default.
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- W4281569151 doi "https://doi.org/10.1016/j.cej.2022.137213" @default.
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