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Boosted photoreduction of diluted CO2 through oxygen vacancy engineering in NiO nanoplatelets

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Abstract

Converting carbon dioxide (CO2) to diverse value-added products through photocatalysis can validly alleviate the critical issues of greenhouse effect and energy shortages simultaneously. In particular, based on practical considerations, exploring novel catalysts to achieve efficient photoreduction of diluted CO2 is necessary and urgent. However, this process is extremely challenging owing to the disturbance of competitive adsorption at low CO2 concentration. Herein, we delicately synthesize oxygen vacancy-laden NiO nanoplatelets (r-NiO) via calcination under Ar protection to reduce diluted CO2 through visible light irradiation (> 400 nm) assisted by a Ru-based photosensitizer. Benefitting from the strongly CO2 adsorption energy of oxygen vacancies, which was confirmed by density functional calculations, the r-NiO catalysts exhibit higher activity and selectivity (6.28 × 103 µmol·h−1·g−1; 82.11%) for diluted CO2-to-CO conversion than that of the normal NiO (3.94 × 103 µmol·h−1·g−1; 65.26%). Besides, the presence of oxygen vacancies can also promote the separation of electron-hole pairs. Our research demonstrates that oxygen vacancies could act as promising candidates for photocatalytic CO2 reduction, offering fundamental guidance for the actual photoreduction of diluted CO2 in the future.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21777046 and 21836002), the National Key Research and Development Program of China (No. 2019YFA0210400), the Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06N569), Guangdong Science and Technology Program (No. 2020B121201003), the Science and Technology Project of Guangzhou (No. 201803030002).

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  1. Weiyi Chen and Xueming Liu contributed equally to this work.

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  1. School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource Recycling, South China University of Technology, Guangzhou, 510006, China

    Weiyi Chen, Xueming Liu, Bin Han, Shujie Liang, Hong Deng & Zhang Lin

  2. Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology, Guangzhou, 510006, China

    Hong Deng & Zhang Lin

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  1. Weiyi Chen
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Chen, W., Liu, X., Han, B. et al. Boosted photoreduction of diluted CO2 through oxygen vacancy engineering in NiO nanoplatelets. Nano Res. 14, 730–737 (2021). https://doi.org/10.1007/s12274-020-3105-1

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