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Nano Research

Article Title

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

Authors

Weiyi Chen, 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
Xueming Liu, 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
Bin Han, 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
Shujie Liang, 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
Hong Deng, 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;Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters , South China University of Technology, Guangzhou 510006, China
Zhang Lin, 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;Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters , South China University of Technology, Guangzhou 510006, China

Keywords

diluted CO2, photocatalytic reduction, oxygen vacancies, NiO nanoplatelets, adsorption

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.

Publisher

Tsinghua University Press

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