Design and Performance Optimization of High-Entropy Perovskite La0.7Sr0.3Co0.4Fe0.1Ni0.4Cu0.1O3 Supercapacitor Electrode Materials

doi:10.16552/j.cnki.issn1001-1625.2024.1532

Abstract

Abstract: High-entropy perovskite oxides are promising electrode materials for supercapacitors due to their excellent structural stability and chemical diversity. In this study, the high-entropy perovskite materials La_0.7Sr_0.3Co_0.4Fe_0.1Ni_xCu_0.5-xO₃(x=0.1, 0.4) were synthesized using the sol-gel method to investigate the effects of varying Ni and Cu molar ratios on the material structure and electrochemical performance. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The results indicate that La_0.7Sr_0.3Co_0.4Fe_0.1Ni_0.4Cu_0.1O₃ exhibits a cubic perovskite structure with small, uniformly distributed grains and a high oxygen vacancy content. Electrochemical testing in the 3 mol/L KOH electrolyte demonstrats that La_0.7Sr_0.3Co_0.4Fe_0.1Ni_0.4Cu_0.1O₃ achieves the specific capacity of 243 F·g^-1 at the current density of 1 A·g^-1, which is 42% higher than conventional LaFeO₃ materials. After 20 000 charge-discharge cycles (current density is 5 A·g^-1), the materials retain 98.3% of their initial specific capacity, demonstrating excellent cycling stability and long cycle life. High-entropy perovskite materials have outstanding electrochemical performance and have application potential as high-performance energy storage materials.

Key words: high-entropy perovskite, La_0.7Sr_0.3Co_0.4Fe_0.1Ni_0.4Cu_0.1O₃, supercapacitor, electrode material, oxygen vacancy, electrochemical performance

CLC Number:

TM53

ZHANG Yaxin, LUO Dongqing, WANG Feifei, LYU Jingbo, QIN Zengming. Design and Performance Optimization of High-Entropy Perovskite La_0.7Sr_0.3Co_0.4Fe_0.1Ni_0.4Cu_0.1O₃ Supercapacitor Electrode Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2693-2700.

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Design and Performance Optimization of High-Entropy Perovskite La_0.7Sr_0.3Co_0.4Fe_0.1Ni_0.4Cu_0.1O₃ Supercapacitor Electrode Materials

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