Journal
NANOSCALE
Volume 12, Issue 25, Pages 13484-13490Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr02556a
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Funding
- NSFC [21575014, 21905025]
- Beijing Natural Science Foundation [2184122]
- Fundamental Research Funds for the Central Universities [2018CX01017]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology) [YBKT18-03]
- Analysis & Testing Center, Beijing Institute of Technology
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Herein, we present a synergistic oxygen-substitution and heterostructure construction strategy to produce a two-dimensional oxygenated-triazine-heptazine-conjugated carbon nitride nanoribbon (TOH-CN). The TOH-CN was proved to have an internal donor-acceptor heterostructure that could promote interfacial charge separation and transport, while the oxygen substitution effect modulated the nanoribbon morphology with increased surface/edge active sites and tuned the electronic structure to extend visible-light absorption as well as to improve band structure alignment. Benefiting from these advantages, the TOH-CN served as an efficient bifunctional photocatalyst for both H(2)and O(2)evolution under visible-light irradiation, exhibiting a 16 times higher photocatalytic H(2)evolution rate than that of its melon-based carbon nitride (g-C3N4) counterpart, and a remarkable apparent quantum yield of 7.9% at 420 nm. The O(2)evolution rate was 6 times higher than that of g-C3N4, even much higher than those of most bifunctional carbon nitride-based photocatalysts. The developed synergistic strategy of oxygen substitution and heterostructure construction will provide an alternative route for the synthesis of efficient polymeric semiconductors toward efficient solar-to-chemical conversion.
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