Citation: Chuanfeng Yang, Wei Teng, Yanhua Song, Yanjuan Cui. C-I codoped porous g-C₃N₄ for superior photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, ;2018, 39(10): 1615-1624. doi: 10.1016/S1872-2067(18)63131-6 shu

C-I codoped porous g-C₃N₄ for superior photocatalytic hydrogen evolution

School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China

Received Date: 5 May 2018
Revised Date: 29 June 2018

Fund Project: The work was supported by the National Natural Science Foundation of China (21503096, 21407067) and the Natural Science Foundation of Jiangsu Province (BK20140506).

Porous C-I codoped carbon nitride materials were synthesized by in-situ codoping with iodized ionic liquid followed by post-thermal treatment in air. The effects of doping content of C-I codoping with different amounts of ionic liquid on the structural, optical and photocatalytic properties of the samples were investigated. Characterization results show that more compact interlayer sacking can be achieved by post-thermal treatment. Combined with C-I codoping by insertion of ionic liquids, much enlarged surface area but optimized sp² conjugated heterocyclic structure can be found in the catalysts. Optical and energy band analysis results evidence that the light absorptions especially in visible light region are significantly improved. Although the band gap of porous C-I codoped samples enlarge because of the generation of porous, the negatively shifted conduction band position thermodynamically supplies stronger motivation for water reduction. Photoelectricity tests reveal that the photo-induced electron density was increased after C-I codoping modification. Also, the recombination rate of electron-hole pairs is remarkably inhibited. The catalysts with moderate C-I codoing content perform sharply enhanced photocatalytic H₂ evolution activity under visible light irradiation. A H₂ evolution rate of 168.2 μmol/h was achieved and it was more than 9.8 times higher than pristine carbon nitride. This study demonstrates a novel non-metal doping strategy for synthesis and optimization of polymer semiconductor with gratifying photocatalytic H₂ evolution performance from water hydrolysis.
- Porous carbon nitride,
- C-I codoping,
- Post-thermal treatment,
- Photocatalysis,
- H₂ evolution
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C-I codoped porous g-C3N4 for superior photocatalytic hydrogen evolution

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通讯作者: 陈斌, bchen63@163.com

C-I codoped porous g-C₃N₄ for superior photocatalytic hydrogen evolution