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

A series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAlx)(1/(5+x))O3-delta (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.

Automated summary

A series of high-entropy perovskite oxides (HEPOs) were synthesized and their crystal structure, microstructure, and elemental composition were investigated. The electrochemical properties of these materials as supercapacitor electrodes were explored, revealing excellent specific capacitance and cycling stability. This research highlights the potential of HEPOs as electrode materials for supercapacitors.