Volume 6, Issue 7 2200099
Research Article

Bandgap Engineering and Oxygen Vacancies of NixV2O5+x (x = 1, 2, 3) for Efficient Visible Light-Driven CO2 to CO with Nearly 100% Selectivity

Yong Chen

Yong Chen

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Yuanming Zhang

Yuanming Zhang

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Wenjing Wang

Wenjing Wang

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Xiaoming Xu

Xiaoming Xu

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Yang Li

Yang Li

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Mengyang Du

Mengyang Du

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Zhaosheng Li

Corresponding Author

Zhaosheng Li

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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Zhigang Zou

Zhigang Zou

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

Jiangsu Key Laboratory of Nano Technology, Nanjing University, 22 Hankou Road, Nanjing, 210093 China

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First published: 29 March 2022
Citations: 4

Abstract

It is difficult to design a new single-component photocatalyst to simultaneously possess a bandgap small enough to absorb most of sunlight and strong redox ability to reduce CO2 into value-added chemical fuels. Herein, bandgap engineering of nickel vanadate compounds (NixV2O5+x, x = 1, 2, 3) is rationally designed to overcome the above challenge. Through changing the Ni:V ratio, the bandgap and band edge positions of nickel vanadates can be regulated, enabling Ni2V2O7 and Ni3V2O8 to reduce CO2 in the presence of water under visible light irradiation that do not exist in NiV2O6. Ni 3d orbitals of Ni2V2O7 and Ni3V2O8 replace V 3d orbitals of NiV2O6 and hybridize with O 2p orbitals to form the valence band maximums, resulting in their negative shifts. Meanwhile, the relatively weaker effect of the crystal field in VO4 tetrahedron over Ni2V2O7 and Ni3V2O8 results in less V 3d split, thus making the conduction band edges to shift upward. In addition, higher concentration of oxygen vacancies over Ni2V2O7 can further enhance its photocatalytic activity for CO2 conversion into CO with nearly 100% selectivity by prolonging the lifetime of photogenerated carriers and improving the chemisorption of CO2.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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