Dipole field in nitrogen-enriched carbon nitride with external forces to boost the artificial photosynthesis of hydrogen peroxide

Zhi Li, Yuanyi Zhou, Yingtang Zhou, Kai Wang, Yang Yun, Shanyong Chen, Wentao Jiao (), Li Chen, Bo Zou and Mingshan Zhu ()
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Zhi Li: Jinan University
Yuanyi Zhou: Jinan University
Yingtang Zhou: Zhejiang Ocean University
Kai Wang: Jilin University
Yang Yun: Shanxi University
Shanyong Chen: Jinan University
Wentao Jiao: Chinese Academy Sciences
Li Chen: Chinese PLA General Hospital
Bo Zou: Jilin University
Mingshan Zhu: Jinan University

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

Abstract: Abstract Artificial photosynthesis is a promising strategy for efficient hydrogen peroxide production, but the poor directional charge transfer from bulk to active sites restricts the overall photocatalytic efficiency. To address this, a new process of dipole field-driven spontaneous polarization in nitrogen-rich triazole-based carbon nitride (C3N5) to harness photogenerated charge kinetics for hydrogen peroxide production is constructed. Here, C3N5 achieves a hydrogen peroxide photosynthesis rate of 3809.5 µmol g−1 h−1 and a 2e− transfer selectivity of 92% under simulated sunlight and ultrasonic forces. This high performance is attributed to the introduction of rich nitrogen active sites of the triazole ring in C3N5, which brings a dipole field. This dipole field induces a spontaneous polarization field to accelerate a rapid directional electron transfer process to nitrogen active sites and therefore induces Pauling-type adsorption of oxygen through an indirect 2e− transfer pathway to form hydrogen peroxide. This innovative concept using a dipole field to harness the migration and transport of photogenerated carriers provides a new route to improve photosynthesis efficiency via structural engineering.

Date: 2023
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DOI: 10.1038/s41467-023-41522-0

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