Understanding the unique S-scheme charge migration in triazine/heptazine crystalline carbon nitride homojunction

Fang Li, Xiaoyang Yue, Yulong Liao, Liang Qiao (), Kangle Lv () and Quanjun Xiang ()
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Fang Li: University of Electronic Science and Technology of China
Xiaoyang Yue: University of Electronic Science and Technology of China
Yulong Liao: University of Electronic Science and Technology of China
Liang Qiao: University of Electronic Science and Technology of China
Kangle Lv: South-Central Minzu University
Quanjun Xiang: University of Electronic Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Understanding charge transfer dynamics and carrier separation pathway is challenging due to the lack of appropriate characterization strategies. In this work, a crystalline triazine/heptazine carbon nitride homojunction is selected as a model system to demonstrate the interfacial electron-transfer mechanism. Surface bimetallic cocatalysts are used as sensitive probes during in situ photoemission for tracing the S-scheme transfer of interfacial photogenerated electrons from triazine phase to the heptazine phase. Variation of the sample surface potential under light on/off confirms dynamic S-scheme charge transfer. Further theoretical calculations demonstrate an interesting reversal of interfacial electron-transfer path under light/dark conditions, which also supports the experimental evidence of S-scheme transport. Benefiting from the unique merit of S-scheme electron transfer, homojunction shows significantly enhanced activity for CO2 photoreduction. Our work thus provides a strategy to probe dynamic electron transfer mechanisms and to design delicate material structures towards efficient CO2 photoreduction.

Date: 2023
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DOI: 10.1038/s41467-023-39578-z

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