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

Show Author's information 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

Abstract

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.

Keywords: supercapacitors, photo-assisted charging, carbon fiber paper-supported CeO2/MnO2 heterojunction (CeO2/MnO2–CFP), long-lasting effect in dark, slow release of stored electrons

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Received: 07 July 2022
Revised: 03 August 2022
Accepted: 18 August 2022
Published: 27 August 2022
Issue date: November 2022

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© The Author(s) 2022.

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51902271), the Fundamental Research Funds for the Central Universities (Grant Nos. 2682021CX116, 2682020CX07, and 2682020CX08), and Sichuan Science and Technology Program (Grant Nos. 2020YJ0259, 2020YJ0072, and 2021YFH0163). We would like to thank Analysis and Testing Center of Southwest Jiaotong University for the assistance on material characterization.

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