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Published July 5, 2021 | Supplemental Material
Journal Article Open

Carbon nitride nanotubes with in situ grafted hydroxyl groups for highly efficient spontaneous H₂O₂ production

Abstract

An active and inexpensive photocatalyst for H₂O₂ production is desirable for industrial applications. However, obtaining high photocatalytic activity from metal-free catalysts without the use of sacrificial electron donors is difficult. Herein, g-C₃N₄ (CN) nanotubes functionalized with surface > OH groups that are grafted in situ were successfully synthesized via a novel alkalinization process. The nanotube structures provide a large surface area and improved mass transfer properties. In situ grafted > OH groups can capture photogenerated holes to promote separation of photogenerated charge, enabling the ready availability of electrons and hydrogen ions for H₂O₂ production. Further, the surface > OH groups help to suppress H₂O₂ self-decomposition. Consequently, a high rate of 240.36 μmol h⁻¹ g⁻¹ of H₂O₂ production can be achieved without sacrificial agents, which is the highest H₂O₂ production in a spontaneous system for metal-free photocatalysts. This work provides a new strategy for an efficient and spontaneous H₂O₂ production method using a metal-free CN photocatalyst.

Additional Information

© 2021 Elsevier. Received 23 December 2020, Revised 6 February 2021, Accepted 6 February 2021, Available online 14 February 2021. The authors gratefully acknowledge the National Key Research and Development Program (2016YFA0204200), the support of the National Natural Science Foundation of China (22006038, 21777044 and 22076046), the China Postdoctoral Science Foundation (2020M681209), the Science and Technology Commission of Shanghai Municipality (19ZR1472400, 19230711300). This research was also supported by Korean National Research Foundation (2017R1E1A1A01074890). CRediT authorship contribution statement: Liang Zhou: Conceptualization, Investigation, Writing - original draft. Juying Lei: Data curation, Supervision. Fuchen Wang: Resources. Lingzhi Wang: Resources, Methodology. Michael R. Hoffmann: Writing - review & editing. Yongdi Liu: Writing - review & editing, Funding acquisition. Su-Il In: Writing - review & editing. Jinlong Zhang: Project administration. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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August 22, 2023
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