Layered perovskite 공기극의 Co-Mn 치환에 따른 전기전도도 특성
; Yu Ri Lim1)
; Yu Taek Hong1)
; Chae Eun Kim1)
; Jun Woong Kim2)
; Sang Ho Lee3)
; Jung Hyun Kim4), *
© 2026 by the New & Renewable Energy
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
In this study, the electrical conductivity of SmBa(Co1-xMnx)2O5+d (SBCMn) (x=0, 0.1, 0.3, 0.5, and 0.7) Solid Oxide Fuel Cell (SOFC) cathode materials were analyzed as a function of Mn substitution in layered perovskite structure. XRD analysis showed that a single-phase layered perovskite structure was maintained for Mn substitution amounts below x = 0.5. Additionally, high-temperature structural stability was confirmed for the single-phase SBCMn 1.8-0.2 chemical compatibility with the CGO91 electrolyte was also confirmed. The amount of Mn substitution has varying effects on electrical conductivity. In both air and N2 atmospheres, electrical conductivity decreased with increasing Mn substitution. Furthermore, Mn substitution of x = 0.1 and 0.3 exhibited a metal-insulator transition (MIT) behavior. Mn substitution altered the specific temperature at which the electrical conductivity of MIT decreased. The material exhibited higher p-type conductivity in air than in N2 atmosphere when used as a cathode. In addition, as the current decreased, the charge-carrier transport path shortened, resulting in higher overall electrical conductivity. Consequently, the maximum electrical conductivity of SBCMn 1.8-0.2 is 467.76 S/cm at 250℃, which is considered a highly satisfactory value.