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

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

Nat Commun

State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, PR China.

Published: July 2023

AI Article Synopsis

Article 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 CO photoreduction. Our work thus provides a strategy to probe dynamic electron transfer mechanisms and to design delicate material structures towards efficient CO photoreduction.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10317968PMC
http://dx.doi.org/10.1038/s41467-023-39578-zDOI Listing

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