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Research Article | Open Access

Photo-assisted charging of carbon fiber paper-supported CeO2/MnO2 heterojunction and its long-lasting capacitance enhancement in dark

Weiyi YANGJian WANGShuang GAOHaoyu ZHANGHongyang WANGQi LI( )
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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It is important to develop green and sustainable approaches to enhance electrochemical charge storage efficiencies. Herein, a two-step in-situ growth process was developed to fabricate carbon fiber paper-supported CeO2/MnO2 composite (CeO2/MnO2–CFP) as a binder-free photoelectrode for the photo-assisted electrochemical charge storage. The formation of CeO2/MnO2 type II heterojunction largely enhanced the separation efficiency of photo-generated charge carriers, resulting in a substantially enhanced photo-assisted charging capability of ~20%. Furthermore, it retained a large part of its photo-enhanced capacitance (~56%) in dark even after the illumination was off for 12 h, which could be attributed to its slow release of stored photo-generated electrons from its specific band structure to avoid their reaction with O2 in dark. This study proposed the design principles for supercapacitors with both the photo-assisted charging capability and its long-lasting retainment in dark, which may be readily applied to other pseudocapacitive materials to better utilize solar energy.

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Journal of Advanced Ceramics
Pages 1735-1750
Cite this article:
YANG W, WANG J, GAO S, et al. Photo-assisted charging of carbon fiber paper-supported CeO2/MnO2 heterojunction and its long-lasting capacitance enhancement in dark. Journal of Advanced Ceramics, 2022, 11(11): 1735-1750.








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Received: 07 July 2022
Revised: 03 August 2022
Accepted: 18 August 2022
Published: 27 August 2022
© The Author(s) 2022.

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