Oxygenated monolayer carbon nitride for excellent photocatalytic hydrogen evolution and external quantum efficiency

Oxygen-modified monolayer g-C3N4 materials (abbreviated as O-g-C3N4) with high crystallinity in a high yield are prepared via thermal oxidation. The partial oxygenation of g-C3N4 was simultaneously achieved, providing the opportunity to collaboratively affect both structure and electron for photocat...

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Bibliographic Details
Published in:Nano energy 2016-09, Vol.27, p.138-146
Main Authors: She, Xiaojie, Wu, Jingjie, Zhong, Jun, Xu, Hui, Yang, Yingchao, Vajtai, Robert, Lou, Jun, Liu, Yang, Du, Daolin, Li, Huaming, Ajayan, Pulickel M.
Format: Article
Language:English
Subjects:
External quantum efficiency
Monolayer
O-g-C3N4
Photocatalytic hydrogen evolution
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Summary:Oxygen-modified monolayer g-C3N4 materials (abbreviated as O-g-C3N4) with high crystallinity in a high yield are prepared via thermal oxidation. The partial oxygenation of g-C3N4 was simultaneously achieved, providing the opportunity to collaboratively affect both structure and electron for photocatalytic hydrogen evolution. The O-g-C3N4 monolayer exhibited a production rate of ~44.37mmol/g (~8874.7μmol/hg) for hydrogen evolution leading to the highest external quantum efficiency (EQE) of 13.7% (at 420nm) of the reported g-C3N4 nanosheets in a 5h duration under visible light irradiation. More promisingly, the photocatalytic reaction proceeded for more than 25h without performance degradation. •The partial oxygenation of monolayer g-C3N4 material was achieved.•Monolayer O-g-C3N4 exhibited the high external quantum efficiency (13.7%, λ=-420 nm).•The production rate of the Monolayer O-g-C3N4 is ~44.37 mmol/g (~8874.7 μmol/hg).
ISSN:2211-2855
DOI:10.1016/j.nanoen.2016.06.042