期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 26, 页码 8676-8680出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900046
关键词
covalent triazine frameworks; heterostructures; hydrogen evolution; photocatalysis; sequential polymerization
资金
- Ministry of Science and Technology of China [2017YFA0204800]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- China Postdoctoral Science Foundation [2018M640518]
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 6.6mmolg(-1)h(-1) was measured for the optimal sample under visible-light irradiation (lambda>420nm), which is far superior to that of most reported conjugated-polymer photocatalysts.
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