Plasma-induced hierarchical amorphous carbon nitride nanostructure with two N-2 (C)-site vacancies for photocatalytic H2O2 production

Zheng, Yanmei ¹Luo, Yi ¹Ruan, Qiushi ¹Wang, Shaohua ¹Yu, Jin ¹Guo, Xinli ¹Zhang, Weijie ¹Xie, Hang ¹Zhang, Zheng ¹Huang, Ying¹

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作者信息

1. Southeast Univ
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Abstract

Carbon nitride (CN) with nitrogen vacancy is a robust photocatalyst with proven enhancing H2O2 production ability. However, nitrogen vacancy control is extremely challenging with the majority of reports representing it as a few vacancies. Herein, for the first time, the amorphous CN (ACN) with two N-2 C-site vacancies in one CN unit is prepared by a one-step H-2 plasma approach. First-principles calculations , experimental results provide consistent evidence that two N-2 C vacancies are located in one CN unit structure after amorphous transformation. Plasma-induced ACN is stable with a hierarchical continuous nanosheet network structure and exhibits an ul-trahigh specific surface area of ~405.76 m(2)g(-1), which is 83 times higher than that of pristine CN (4.89 m(2)g(-1)) and significantly enhanced photocatalytic H2O2 production, yielding 1874 mu molg(-1)h(-1). Besides, the existence potential drop of 2.61 eV for the electrostatic potential in ACN is key to charge carrier separation. Moreover, the amorphous transformation leads to a new strong band tail, which remarkably enhances the absorbance edge of ACN up to 593 nm, resulting in a wider range of visible-light absorption to enhance H2O2 production. The results have provided an effective approach for promoting the practical application of ACN in photocatalytic H2O2 production.

Key words

Plasma treatment/Amorphous carbon nitride (ACN)/H2O2 production/Hierarchical nanostructure/N-2C-site vacancy/First-principles calculations/INTERFACIAL CHARGE-TRANSFER/OXYGEN-DOPED G-C3N4/HYDROGEN EVOLUTION/PRODUCTION ABILITY/CRYSTALLINE/ABSORPTION/NANOSHEETS

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量45

参考文献量59

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