Research Article


Multiscale structural engineering of carbon nitride for enhanced photocatalytic H2O2 production

Qing He1, Bounxome Viengkeo1, Xuan Zhao1, Zhengyuan Qin2, Jie Zhang1, Xiaohan Yu1, Yongpan Hu1, Wei Huang1 (✉), and Yanguang Li1,3 (✉)

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1 Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
2 National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
3 Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Macau 999078, China

Keywords: photocatalytic H2O2 production, oxygen reduction, carbon nitride, multiscale structural engineering
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Carbon nitride (C3N4) holds great promise for photocatalytic H2O2 production from oxygen reduction. In spite of great research efforts, they still suffer from low catalytic efficiency primarily limited by the fast recombination of photogenerated charge carriers. In this work, we report the multiscale structural engineering of C3N4 to significantly improve its optoelectronic properties and consequently photocatalytic performance. The product consists of porous spheres with high surface areas, abundant nitrogen defects, and alkali metal doping. Under visible light irradiation, our catalyst shows a remarkable H2O2 production rate of 3,080 μmol·g−1·h−1, which is more than 10 times higher than that of bulk C3N4 and exceeds those of most other C3N4-based photocatalysts. Moreover, the catalyst exhibits great stability, and can continuously work for 15 h without obvious activity decay under visible light irradiation, eventually giving rise to a high H2O2 concentration of ca. 45 mM.
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Multiscale structural engineering of carbon nitride for enhanced photocatalytic H2O2 production. Nano Res.

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