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Introducing b–n unit boosts photocatalytic H_(2)O_(2) production on metal-free g-C_(3)n_(4)nanosheets

nano Research 2023年第2期16卷 2177-2184页

作者： Weikang Wang Wei Zhang Yueji Cai Qing Wang Juan Deng Jingsheng Chen Zhifeng Jiang Yizhou Zhang Chao Yu School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China School of Chemistry and Materials Science Institute of Advanced Materials and Flexible Electronics(IAMFE) Nanjing University of Information Science and TechnologyNanjing 210044China

Metal-free catalyst for photocatalytic production of H_(2)O_(2)is highly desirable with the long-term vision of artificial photosynthesis of solar *** particular,the specific chemical bonds for selective H_(2)O_(2)photosynthesis via 2e–oxygen reduction reactions(ORR)remain to be explored for understanding the forming mechanism of active ***,we report a facile doping method to introduce boron-nitrogen(b–n)bonds into the structure of graphitic carbon nitride(g-C_(3)n_(4))nanosheets(denoted as bCnnS)to provide significant photocatalytic activity,selectivity and *** theoretical calculation and experimental results reveal that the electron-deficient b–n units serving as electron acceptors improve photogenerated charge separation and *** units are also proved to be superior active sites for selective O_(2)adsorption and activation,reducing the energy barrier for*OOH formation,and thereby enabling an efficient 2e–ORR pathway to H_(2)O_(2).Consequently,with only bare loss of activity during repeated cycles,the optimal H2O2 production rate by bCnnS photocatalysts reaches 1.16 mmol·L^(–1)·h^(–1)under 365 nm-monochrome light emitting diode(LED365nm)irradiation,increasing nearly 2–5 times as against the state-of-art metal-free *** work gives the first example of applying b–n bonds to enhance the photocatalytic H_(2)O_(2)production as well as unveiling the underlying reaction pathway for efficient solar-energy transformations.

关键词： graphitic carbon nitride(g-C_(3)n_(4))nanosheets metal-free photocatalyst b–n bonds oxygen reduction reaction H2O2 production

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