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Efficient visible-light activation of molecular oxygen to produce hydrogen peroxide using P doped g-C3N4 hollow spheres

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Abstract

Graphitic carbon nitride (g-C3N4) possesses unique electronic and optical properties in the visible-light-driven production of H2O2. However, bulk g-C3N4 suffers from inefficient sunlight absorption and low carrier mobility. Herein, P doped g-C3N4 with a hollow sphere architecture was synthesized. The hollow sphere structure provides a large accessible surface area for charge transfer and enhances photo-absorption properties. Particularly, the doped P can regulate the energy band structure with stronger reducibility for O2 activation and accelerate photo-generated carrier separation. Meanwhile, the P heteroatom is beneficial to produce 1,4-endoperoxide species more easily and enhance selectivity for H2O2 synthesis through a two-electron O2 reduction process. The resultant catalyst exhibits a high H2O2 production rate of 174 μmol h−1 g−1 in pure water and 1684 μmol h−1 g−1 with isopropanol as a hole scavenger, which are 7.5 and 11.2 times those of bulk g-C3N4. This work provides a new avenue for the design and modification of other photocatalysts for H2O2 production.

Graphical abstract: Efficient visible-light activation of molecular oxygen to produce hydrogen peroxide using P doped g-C3N4 hollow spheres

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Article information


Submitted
08 Aug 2020
Accepted
05 Oct 2020
First published
05 Oct 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Efficient visible-light activation of molecular oxygen to produce hydrogen peroxide using P doped g-C3N4 hollow spheres

X. Dang, R. Yang, Z. Wang, S. Wu and H. Zhao, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA07794A

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