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Facile synthesis of bead-chain structured MWCNTs@CeO2 with oxygen vacancies-rich for promoting electrochemical energy storage.

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Title: Facile synthesis of bead-chain structured MWCNTs@CeO2 with oxygen vacancies-rich for promoting electrochemical energy storage.
Authors: Cao, Xiao-Man1 (AUTHOR), Chen, Jia-Qi1 (AUTHOR), Zhao, Xin-Rui1 (AUTHOR), Ge, Hao2 (AUTHOR), Liu, Daliang3 (AUTHOR), Wu, Qiong3 (AUTHOR), Sun, Zhi-Jia1 (AUTHOR) sunzhijia@bhu.edu.cn, Zhang, Qingguo1 (AUTHOR) zhangqingguo@bhu.edu.cn
Source: Chemical Engineering Journal. Jan2024, Vol. 479, pN.PAG-N.PAG. 1p.
Subjects: Energy storage, Carbon-based materials, Metallic oxides, Cerium oxides, Oxygen electrodes, Supercapacitor electrodes, Carbon nanotubes
Abstract: [Display omitted] • Bead-chain structured MWCNTs@CeO 2 is prepared by a controllable approach. • MWCNTs can be used without any covalent or non-covalent modification. • Unique structure and rich O-vacancies boost the electrochemical energy storage. The extraordinary properties of metal oxides (MOs) have led to their increasing recognition as a potential material for energy storage systems, along with exceptional performance enhancement. Given the inherently finite electronic conductivity exhibited by most metallic oxides, commonly employed strategies to overcome this limitation involve their integration with conducting carbon materials or the introduction of oxygen vacancies. Herein, bead-chain structured MWCNTs@CeO 2 with abundant oxygen vacancies (BC MWCNTs@Ov-CeO 2) was successfully synthesized by utilizing chain-like MWCNTs to string together bead-like CeO 2 nanoparticles, through a facile solvothermal approach. In particular, MWCNTs are neither covalently nor non-covalently modified, substantially simplifying fabrication procedures. The incorporation of carbon nanotubes and the abundance of oxygen vacancies effectively enhance charge storage dynamics, leading to significant improvements in conductivity and electrochemical properties beyond those previously reported CeO 2 -based composites. BC MWCNTs@Ov-CeO 2 exhibited an impressive specific capacitance of 421.1 F g−1 at 1 A/g, outperforming pure CeO 2 by 286%, demonstrating its superior capacitance performance. According to various theoretical and experimental investigations, it has been firmly established that the presence of conductive networks and oxygen vacancies significantly enhances the electrochemical properties of MOs. This research emphasizes the importance of understanding oxygen vacancies in electrode materials, providing a systematic approach for the development of future energy storage devices. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] • Bead-chain structured MWCNTs@CeO 2 is prepared by a controllable approach. • MWCNTs can be used without any covalent or non-covalent modification. • Unique structure and rich O-vacancies boost the electrochemical energy storage. The extraordinary properties of metal oxides (MOs) have led to their increasing recognition as a potential material for energy storage systems, along with exceptional performance enhancement. Given the inherently finite electronic conductivity exhibited by most metallic oxides, commonly employed strategies to overcome this limitation involve their integration with conducting carbon materials or the introduction of oxygen vacancies. Herein, bead-chain structured MWCNTs@CeO 2 with abundant oxygen vacancies (BC MWCNTs@Ov-CeO 2) was successfully synthesized by utilizing chain-like MWCNTs to string together bead-like CeO 2 nanoparticles, through a facile solvothermal approach. In particular, MWCNTs are neither covalently nor non-covalently modified, substantially simplifying fabrication procedures. The incorporation of carbon nanotubes and the abundance of oxygen vacancies effectively enhance charge storage dynamics, leading to significant improvements in conductivity and electrochemical properties beyond those previously reported CeO 2 -based composites. BC MWCNTs@Ov-CeO 2 exhibited an impressive specific capacitance of 421.1 F g−1 at 1 A/g, outperforming pure CeO 2 by 286%, demonstrating its superior capacitance performance. According to various theoretical and experimental investigations, it has been firmly established that the presence of conductive networks and oxygen vacancies significantly enhances the electrochemical properties of MOs. This research emphasizes the importance of understanding oxygen vacancies in electrode materials, providing a systematic approach for the development of future energy storage devices. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2023.147663