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2019, 12(11): 2749–2759

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https://doi.org/10.1007/s12274-019-2509-2

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

Qian Li1,2, Songcan Wang3, Zhuxing Sun4, Qijun Tang1,2, Yiqiu Liu1,2, Lianzhou Wang3 (*), Haiqiang Wang1,2 (*), and Zhongbiao Wu1,2

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1 Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310058, China
2 Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution Control, Hangzhou 311202, China
3 Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
4 School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Keywords: photocatalytic, CO2 reduction, graphitic carbon nitride (g-C3N4), carbon quantum dot, oxygen doping
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  • Abstract
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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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Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4. Nano Res. 2019, 12(11): 2749–2759 https://doi.org/10.1007/s12274-019-2509-2

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