Detailed impedance and electrical studies of Zr4+ doped La0.7Ca0.3 (Mn0.5 Fe0.5) O3 for cathode materials in solid oxide fuel cells. (2022)

• Record Type: Journal Article
• Authors: Chhabra, Yogesh; Kumar, Rakesh; Singh Malhi, Parambir; Chopra, Vibha; Arora, Vishal; Sachdeva, M.
• Is Part Of: Materials today. Volume 65:Part 1(2022)
• Page Start: 192
• Page End: 199
• Publication Date: 2022
• Subjects: SOFC -- Impedance -- Conductivity; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.06.082
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The solid state reaction approach was used to prepare the (La0.7 Ca0.3 )(Mn0.5 Fe0.5 )1- x Zr x O3 (where × = 0.1 and 0.5) system for use as a cathode in solid oxide fuel cells. The impedance and electrical properties have been investigated. The ac impedance spectra of the samples show a grain boundary contribution to total conductivity and diffusion controlled impedance. A wide range impedance spectroscopy research from 50 to 200 °C revealed both bulk and grain boundary effects. At higher temperatures, oxygen vacancies could be used as ionic charge carriers, indicating an Arrhenius-type thermally activated process. The hopping mechanism for electrical processes in the system was shown by the fluctuation in ac conductivity as a function of frequency.