Supercapacitor application of Sr-doped LaCo0.2Fe0.8O3 perovskite oxide: Investigation of structural and electrochemical properties

Jafar Mostafaei, Ali Çoruh, Asghar Asgari, Elnaz Asghari, Aligholi Niaei

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, La1-xSrxCo0.2Fe0.8O3 (LSCF-x, x = 0.0, 0.2, 0.5, 0.8) perovskite oxides were synthesized as a supercapacitor electrode material using the combustion sol-gel method. A comprehensive analysis was conducted to examine the structural and electrochemical properties of LSCF-x. The partial substitution of Sr instead of La in the A site had a notable impact on the content of oxygen vacancies and the enhancement in the oxidation states of the B site cation. Among the synthesized samples, LSCF-0.8 showed excellent electrochemical performance. This sample demonstrated a distinct capacitance value of 318.7 F·g−1 at a current density of 2 A·g−1, also, LSCF-0.8 had a lower intrinsic resistance in 1 M KOH. Efficient energy storage in LSCF-x due to the redox reaction of B site cations occurring at the surface. Adjusting the Sr doping ratio has a significant effect on this reaction. In addition, the symmetric cell of LSCF-0.8 showed an energy density of 177.056 W·h·kg−1 at a power density of 2000 W·kg−1, this cell was able to sustain 86 % of its original specific capacitance after 5000 cycles of charge-discharge.

Original languageEnglish
Article number112394
Number of pages11
JournalJournal of Energy Storage
Volume93
Early online date7 Jun 2024
DOIs
Publication statusPublished - 15 Jul 2024

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