Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 43, Pages 22720-22727Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta07794a
Keywords
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Funding
- National Natural Science Foundation of China [21976022]
- Fundamental Research Funds for the Central Universities [DUT20LAB102]
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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 O-2 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 O-2 reduction process. The resultant catalyst exhibits a high H2O2 production rate of 174 mu mol h(-1) g(-1) in pure water and 1684 mu mol 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.
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