Citation: Jing Jiang, Shaowen Cao, Chenglong Hu, Chunhua Chen. A comparison study of alkali metal-doped g-C₃N₄ for visible-light photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, ;2017, 38(12): 1981-1989. doi: 10.1016/S1872-2067(17)62936-X shu

A comparison study of alkali metal-doped g-C₃N₄ for visible-light photocatalytic hydrogen evolution

a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, Hubei, China

Received Date: 9 October 2017
Revised Date: 19 October 2017

Fund Project: This work was supported by the National Natural Science Foundation of of China (51472191, 21407115, 21773179), the Natural Science Foundation of Hubei Province of China (2017CFA031), and the Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education (JDGD-201509).

Photocatalytic hydrogen production based on semiconductor photocatalysts has been considered as one of the most promising strategies to resolve the global energy shortage. Graphitic carbon nitride (g-C₃N₄) has been a star visible-light photocatalyst in this field due to its various advantages. However, pristine g-C₃N₄ usually exhibits limited activity. Herein, to enhance the performance of g-C₃N₄, alkali metal ion (Li⁺, Na⁺, or K⁺)-doped g-C₃N₄ are prepared via facile high-temperature treatment. The prepared samples are characterized and analyzed using the technique of XRD, ICP-AES, SEM, UV-vis DRS, BET, XPS, PL, TRPL, photoelectrochemical measurements, photocatalytic tests, etc. The resultant doped photocatalysts show enhanced visible-light photocatalytic activities for hydrogen production, benefiting from the increased specific surface areas (which provide more active sites), decreased band gaps for extended visible-light absorption, and improved electronic structures for efficient charge transfer. In particular, because of the optimal tuning of both microstructure and electronic structure, the Na-doped g-C₃N₄ shows the most effective utilization of photogenerated electrons during the water reduction process. As a result, the highest photocatalytic performance is achieved over the Na-doped g-C₃N₄ photocatalyst (18.7 μmol/h), 3.7 times that of pristine g-C₃N₄ (5.0 μmol/h). This work gives a systematic study for the understanding of doping effect of alkali metals in semiconductor photocatalysis.
- g-C₃N₄,
- Alkali metal doping,
- Photocatalytic hydrogen production,
- Visible light,
- Charge transfer
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通讯作者: 陈斌, bchen63@163.com

A comparison study of alkali metal-doped g-C₃N₄ for visible-light photocatalytic hydrogen evolution