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Journal of Advanced Ceramics 2022, 11(5): 742-753 https://doi.org/10.1007/s40145-022-0568-4
Research Article | Open Access | Issue | Published: 20 April 2022

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

Show Author's Information Meng GUO,  Yufeng LIU,  Fengnian ZHANG,  Fuhao CHENG,  Chufei CHENG,  Yang MIAO( ),  Feng GAO,  Jun YU
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Keywords:
supercapacitors, high-entropy oxides (HEOxs), perovskite structure, Al3+-doping
Cite this article:
GUO M, LIU Y, ZHANG F, et al. Inactive Al3+-doped La(CoCrFeMnNiAlx)1/(5+x)O3 high-entropy perovskite oxides as high performance supercapacitor electrodes. Journal of Advanced Ceramics, 2022, 11(5): 742-753. https://doi.org/10.1007/s40145-022-0568-4
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Abstract Full text About this article

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 GUO, Yufeng LIU, Fengnian ZHANG, Fuhao CHENG, Chufei CHENG, Yang MIAO( ), Feng GAO, Jun 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: supercapacitors, high-entropy oxides (HEOxs), perovskite structure, Al3+-doping

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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

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© 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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