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Research Article

Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4

Qian Li1,2Songcan Wang3Zhuxing Sun4Qijun Tang1,2Yiqiu Liu1,2Lianzhou Wang3( )Haiqiang Wang1,2( )Zhongbiao Wu1,2
Key Laboratory of Environment Remediation and Ecological Health, Ministry of EducationCollege of Environmental and Resources Science, Zhejiang UniversityHangzhou310058China
Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution ControlHangzhou311202China
Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of Queensland, BrisbaneQLD4072Australia
School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China
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Abstract

Graphitic carbon nitride (g-C3N4, CN) exhibits inefficient charge separation, deficient CO2 adsorption and activation sites, and sluggish surface reaction kinetics, which have been recognized as the main barriers to its application in CO2 photocatalytic reduction. In this work, carbon quantum dot (CQD) decoration and oxygen atom doping were applied to CN by a facile one-step hydrothermal method. The incorporated CQDs not only facilitate charge transfer and separation, but also provide alternative CO2 adsorption and activation sites. Further, the oxygen-atom-doped CN (OCN), in which oxygen doping is accompanied by the formation of nitrogen defects, proves to be a sustainable H+ provider by facilitating the water dissociation and oxidation half-reactions. Because of the synergistic effect of the hybridized binary CQDs/OCN addressing the three challenging issues of the CN based materials, the performance of CO2 photocatalytic conversion to CH4 over CQDs/OCN-x (x represents the volume ratio of laboratory-used H2O2 (30 wt.%) in the mixed solution) is dramatically improved by 11 times at least. The hybrid photocatalyst design and mechanism proposed in this work could inspire more rational design and fabrication of effective photocatalysts for CO2 photocatalytic conversion with a high CH4 selectivity.

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Nano Research
Pages 2749-2759
Cite this article:
Li Q, Wang S, Sun Z, et al. Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4. Nano Research, 2019, 12(11): 2749-2759. https://doi.org/10.1007/s12274-019-2509-2
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Received: 22 June 2019
Revised: 10 August 2019
Accepted: 27 August 2019
Published: 23 September 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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