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Title: Degradation Analysis of Solid Oxide Fuel Cells with (La,Sr)(Co,Fe)O3-δ Cathode/Gd2O3–CeO2 Interlayer/Y2O3–ZrO2 Electrolyte System: The Influences of Microstructural Change and Solid Solution Formation
Authors: Matsui, Toshiaki
Li, Siqi
Inoue, Yuki
Yoshida, Norifumi
Muroyama, Hiroki
Eguchi, Koichi
Author's alias: 松井, 敏明
李, 思斉
井上, 結稀
吉田, 憲史
室山, 広樹
江口, 浩一
Keywords: Fuel Cells - Solid oxide
High Temperature Materials
Solid-State Ionics
ceria-zirconia solid solutions
degradation factors
Solid oxide fuel cells
Issue Date: 2019
Publisher: The Electrochemical Society
Journal title: Journal of The Electrochemical Society
Volume: 166
Issue: 4
Start page: F295
End page: F300
Abstract: Solid oxide fuel cells with a configuration of (La, Sr)(Co, Fe)O3‒δ cathode/doped ceria interlayer/zirconia-based electrolyte have been extensively studied to elucidate the degradation mechanism. Various degradation factors were suggested, such as the formation of highly-resistive SrZrO3 phase, and the reduction in active reaction sites because of the agglomeration of constituent materials. Among them, however, the influence of the ceria-zirconia solid solution formation at the doped ceria interlayer/zirconia-based electrolyte on the cell performance has not been elucidated sufficiently. In this study to achieve a comprehensive understanding of degradation phenomena at the cathode side, the chemical information of constituent materials, as well as the microstructural parameters, were analyzed for single cells before and after discharge operation. Especially, the ionic conductivity of solid solutions formed in the (La, Sr)(Co, Fe)O3‒δ/Gd2O3-CeO2/Y2O3-ZrO2 system was investigated in detail to clarify the ionic conductivity profile at the Gd2O3-CeO2/Y2O3-ZrO2 interface.
Rights: © The Author(s) 2019. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org.
URI: http://hdl.handle.net/2433/237836
DOI(Published Version): 10.1149/2.0841904jes
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