Citation: Yue Pan, Wenping Si, Yahao Li, Haotian Tan, Ji Liang, Feng Hou. Promoting exciton dissociation by metal ion modification in polymeric carbon nitride for photocatalysis[J]. Chinese Chemical Letters, ;2024, 35(12): 109877. doi: 10.1016/j.cclet.2024.109877 shu

Promoting exciton dissociation by metal ion modification in polymeric carbon nitride for photocatalysis

Yue Pan ^a ,
Wenping Si ^{b, *,} ,
Yahao Li ^a ,
Haotian Tan ^a ,
Ji Liang ^{a, *,} ,
Feng Hou ^{a, *,}

a.
Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
b.
School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China

siwp@hebut.edu.cn

liangji@tju.edu.cn

houf@tju.edu.cn

Received Date: 18 January 2024
Revised Date: 7 April 2024
Accepted Date: 8 April 2024
Available Online: 9 April 2024

Figures(4)

Carbon nitride, a typical low-dimensional conjugated polymer photocatalyst, features a high exciton binding energy due to the weak dielectric screening and the strong Coulombic attraction of photogenerated electrons and holes. The reduction of the exciton binding energy of carbon nitride to promote the conversion from excitons into free carriers is the first priority for the improvement of charge-transfer-dependent photocatalytic reaction activity. In this paper, by introducing a variety of polar metal cations to carbon nitride, it is demonstrated that the charge distribution of the heptazine ring can be improved by ion polarization, which effectively promotes the dissociation of excitons into electrons and holes. The sodium ion shows the best modification effect, which enhances the rate of both photocatalytic hydrogen and hydrogen peroxide production by about 50%. Characterization shows that the introduction of strongly polar metal cations contributes to the reduction of the exciton dissociation energy of carbon nitride. This study provides a new perspective and a convenient method for the exciton modulation engineering of low-dimensional photocatalysts.
- Exciton dissociation,
- Carbon nitride,
- Photocatalysis,
- Alkali metal ions,
- Exciton binding energy
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