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Research Article | Open Access

Oxygen vacancy-rich MoO3 nanorods as photocatalysts for photo-assisted Li–O2 batteries

Guiru Sun, Daming Yang, Zexu Zhang, Yan Wang, Wei Lu, Ming Feng( )
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
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Abstract

Photo-assisted lithium–oxygen (Li–O2) batteries have been developed as a new system to reduce a large overpotential in the Li–O2 batteries. However, constructing an optimized photocatalyst is still a challenge to achieve broad light absorption and a low recombined rate of photoexcited electrons and holes. Herein, oxygen vacancy-rich molybdenum trioxide (MoO3−x) nanorods are employed as photocatalysts to accelerate kinetics of cathode reactions in the photo-assisted Li–O2 batteries. Oxygen vacancies on the MoO3−x nanorods can not only increase light-harvesting capability but also improve electrochemical activity for the cathode reactions. Under illumination, the photoexcited electrons and holes are effectively separated on the MoO3−x nanorods. During discharging, activated O2 is reduced to Li2O2 by the photoexcited electrons from the MoO3−x nanorods. The photoexcited holes can promote the decomposition of Li2O2 during subsequent charging. Accordingly, the photo-assisted Li–O2 batteries with the MoO3−x nanorods deliver an ultralow overpotential of 0.22 V, considerable rate capability, and good reversibility. We think that this work could give a reference for the exploitation and application of the photocatalysts in the photo-assisted Li–O2 batteries.

Keywords

molybdenum trioxide (MoO3) nanorodsoxygen vacancyphotocatalystphoto-assistancelithium–oxygen (Li–O2) batteries

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Journal of Advanced Ceramics
Volume 12 Issue 4,
April 2023
Pages 747-759
DOI: 10.26599/JAC.2023.9220717
Cite this article:
Sun G, Yang D, Zhang Z, et al. Oxygen vacancy-rich MoO3 nanorods as photocatalysts for photo-assisted Li–O2 batteries. Journal of Advanced Ceramics, 2023, 12(4): 747-759. https://doi.org/10.26599/JAC.2023.9220717

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Received: 26 October 2022
Revised: 16 December 2022
Accepted: 04 January 2023
Published: 06 March 2023
© The Author(s) 2023.

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