Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 266, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118586
Keywords
Covalent connection; Covalent-organic frameworks; Hybrid evolution reaction; Photocatalysis
Funding
- National Natural Science Foundation of China [21676066]
- Special Fund for Scientific and Technological Innovation Talents of Harbin Science and Technology Bureau [2017RAQXJ057]
- key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education Open Project Fund
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Rationally combining the advantage of inorganic and organic semiconductors to construct a heterojunction is an effective way to boost the photocatalytic activity of materials, while it is still a great challenge to tightly integrate these two different components together. In this work, for the first time, the TpPa-1-COF, an excellent visible-light harvesting covalent-organic frameworks (COFs), and TiO2 were combined together by covalent bonds to construct a heterojunction. The resulting TiO2-TpPa-1-COF hybrid materials show efficient photocatalytic activity under visible light irradiation. Especially, TiO2-TpPa-1-COF (1:3) exhibits the optimized photocatalytic H-2 evolution rate of 11.19 mmol g(-1) h(-1) and apparent quantum efficiency of 7.6 % at lambda = 420 nm, which is 5.3 and 3.0 times higher than the TpPa-1-COF and TiO2/TpPa-1-COF, respectively. Further investigations confirm that the covalent connection between TiO2 and TpPa-1-COF components can largely improve the transfer of photogenerated charges of COF, leading to the efficient H-2 evolution activity.
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