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Molecular Heterostructures of Covalent Triazine Frameworks for Enhanced Photocatalytic Hydrogen Production
Author(s) -
Huang Wei,
He Qing,
Hu Yongpan,
Li Yanguang
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201900046
Subject(s) - covalent bond , photocatalysis , conjugated system , polymerization , polymer , materials science , triazine , photochemistry , hydrogen production , charge carrier , heterojunction , thiophene , chemical engineering , polymer chemistry , chemistry , hydrogen , optoelectronics , organic chemistry , catalysis , composite material , engineering
Conjugated polymers have emerged as promising candidates for photocatalytic H 2 production owing to their structural designability and functional diversity. However, the fast recombination of photoexcited electrons and holes limits their H 2 production rates. We have now designed molecular heterostructures of covalent triazine frameworks to facilitate charge‐carrier separation and promote photocatalytic H 2 production. Benzothiadiazole and thiophene moieties were selectively incorporated into the covalent triazine frameworks as electron‐withdrawing and electron‐donating units, respectively, by a sequential polymerization strategy. The resulting hybrids exhibited much improved charge‐carrier‐separation efficiency as evidenced by photophysical and electrochemical characterization. An H 2 evolution rate of 6.6 mmol g −1 h −1 was measured for the optimal sample under visible‐light irradiation ( λ >420 nm), which is far superior to that of most reported conjugated‐polymer photocatalysts.