Na-mediated carbon nitride realizing CO2 photoreduction with selectivity modulation

By embedding Na ions into graphitic carbon nitride, the directional migration of photo-generated electrons towards Na sites is achieved, thereby creating additional reaction sites. Moreover, the electron-rich Na sites enhance the adsorption and activation of CO2. Consequently, the photocatalytic per...

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Bibliographic Details
Published in:Journal of colloid and interface science 2024-09, Vol.670, p.348-356
Main Authors: Han, Yi, Li, Wen, Bi, Chuanzhou, Liu, Jinyuan, Xu, Hangmin, Song, Hao, Zhong, Kang, Yang, Jinman, Jiang, Weiyi, Yi, Jianjian, Wang, Bin, Chu, Paul K., Ding, Penghui, Xu, Hui, Zhu, Xingwang
Format: Article
Language:English
Subjects:
adsorption
carbon dioxide
carbon nitride
Carrier separation
CO2 reduction
energy
Fourier transform infrared spectroscopy
g-C3N4
graphene
Ion intercalation
irradiation
lighting
photocatalysis
Photocatalysts
photoreduction
photosynthesis
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Summary:By embedding Na ions into graphitic carbon nitride, the directional migration of photo-generated electrons towards Na sites is achieved, thereby creating additional reaction sites. Moreover, the electron-rich Na sites enhance the adsorption and activation of CO2. Consequently, the photocatalytic performance is improved to some extent. [Display omitted] The depressed directional separation of photogenerated carriers and weak CO2 adsorption/activation activity are the main factors hampering the development of artificial photosynthesis. Herein, Na ions are embedded in graphitic carbon nitride (g-C3N4) to achieve directional migration of the photogenerated electrons to Na sites, while the electron-rich Na sites enhance CO2 adsorption and activation. Na/g-C3N4 (NaCN) shows improved photocatalytic reduction activity of CO2 to CO and CH4, and under simulated sunlight irradiation, the CO yield of NaCN synthesized by embedding Na at 550°C (NaCN-550) is 371.2 μmol g−1 h−1, which is 58.9 times more than that of the monomer g-C3N4. By means of theoretical calculations and experiments including in situ fourier transform infrared spectroscopy, the mechanism is investigated. This strategy which improves carrier separation and reduces the energy barrier at the same time is important to the development of artificial photosynthesis.
ISSN:0021-9797
1095-7103
1095-7103
DOI:10.1016/j.jcis.2024.05.003