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A series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAlx)1/(5+x)O3−δ (x = 0.4, 0.5, 0.6, and 0.7) have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for supercapacitors. The crystal structure, microstructure, and elemental composition of HEPOs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) in detail. The electrochemical properties of HEPOs as supercapacitor electrodes were elucidated. The specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) are 281.84, 353.65, 325.60, and 259.30 F/g at the current density of 1 A/g, respectively. After 2000 cycles, the specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) remain 85.01%, 88.61%, 86.37%, and 91.25%, respectively. Such outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al3+-doping suppressing active ion aggregation during charge–discharge process. This research highlights the potential of HEPOs as electrodes for supercapacitors.


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Inactive Al3+-doped La(CoCrFeMnNiAlx)1/(5+x)O3 high-entropy perovskite oxides as high performance supercapacitor electrodes

Show Author's information Meng GUOYufeng LIUFengnian ZHANGFuhao CHENGChufei CHENGYang MIAO( )Feng GAOJun YU
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Abstract

A series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAlx)1/(5+x)O3−δ (x = 0.4, 0.5, 0.6, and 0.7) have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for supercapacitors. The crystal structure, microstructure, and elemental composition of HEPOs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) in detail. The electrochemical properties of HEPOs as supercapacitor electrodes were elucidated. The specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) are 281.84, 353.65, 325.60, and 259.30 F/g at the current density of 1 A/g, respectively. After 2000 cycles, the specific capacitances of HEPOs (x = 0.4, 0.5, 0.6, and 0.7) remain 85.01%, 88.61%, 86.37%, and 91.25%, respectively. Such outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al3+-doping suppressing active ion aggregation during charge–discharge process. This research highlights the potential of HEPOs as electrodes for supercapacitors.

Keywords:

high-entropy oxides (HEOxs), perovskite structure, Al3+-doping, supercapacitors
Received: 31 August 2021 Revised: 24 December 2021 Accepted: 08 January 2022 Published: 20 April 2022 Issue date: May 2022
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Publication history

Received: 31 August 2021
Revised: 24 December 2021
Accepted: 08 January 2022
Published: 20 April 2022
Issue date: May 2022

Copyright

© The Author(s) 2022.

Acknowledgements

This research was supported by the National Science Foundation for Young Scientists of China (Grant No. 51802213), Program of Applied Basic Research Program of Shanxi Province (Grant No. 201901D211118), and Key R&D Program of Shanxi Province (Grant No. 202102030201006).

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