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

doi:10.1016/S1872-2067(17)62936-X

Abstract

Abstract:

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.

Key words: g-C₃N₄, Alkali metal doping, Photocatalytic hydrogen production, Visible light, Charge transfer

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.

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

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