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Interface formation and Mn segregation of directly assembled La0.8Sr0.2MnO3 cathode on Y2O3-ZrO2 and Gd2O3-CeO2 electrolytes of solid oxide fuel cells

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He, Shuai, Chen, Kongfa, Saunders, Martin, Quadir, Zakaria, Tao, Shanwen, Irvine, John T.S., Cui, C. Q. and Jiang, San Ping (2018) Interface formation and Mn segregation of directly assembled La0.8Sr0.2MnO3 cathode on Y2O3-ZrO2 and Gd2O3-CeO2 electrolytes of solid oxide fuel cells. Solid State Ionics, 325 . pp. 176-188. doi:10.1016/j.ssi.2018.08.016

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Official URL: http://dx.doi.org/10.1016/j.ssi.2018.08.016

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Abstract

The establishment of intimate electrode/electrolyte interface is very important in solid oxide fuel cells (SOFCs), because it plays a critical role in the overall cell performance and durability. In this study, Mn segregation and interface formation between directly assembled La0.8Sr0.2MnO3 (LSM) electrode and yttrium-stabilized zirconia (YSZ) or gadolinium-doped ceria (GDC) electrolytes are studied using combined focused ion beam and scanning transmission electron microscopy (FIB-STEM). In the case of LSM/YSZ and LSM/GDC electrodes, a significant reduction in the electrode ohmic resistance is observed after cathodic polarization at 900 °C and 500 mA cm−2, indicating the formation of an intimate interface. However, LSM particles start to disintegrate at the electrode/electrolyte interface with the increase of polarization time in the case of LSM/YSZ electrode. On the other hand, the LSM/GDC interface is very stable with negligible microstructure change at the interface. Mn segregation from the LSM perovskite structure is identified under the influence of polarization in both LSM/YSZ and LSM/GDC electrodes. The results demonstrate that nature of the electrolyte plays a critical role in the electrochemical activity, microstructure, morphology and stability of LSM/electrolyte interface under SOFC operation conditions.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Solid oxide fuel cells, Zirconium oxide, Perovskite
Journal or Publication Title: Solid State Ionics
Publisher: Elsevier Science BV
ISSN: 0167-2738
Official Date: 1 November 2018
Dates:
DateEvent
1 November 2018Published
31 August 2018Available
26 August 2018Accepted
Volume: 325
Page Range: pp. 176-188
DOI: 10.1016/j.ssi.2018.08.016
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
DP180100731 [ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
DP180100568[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
2017A050501053Natural Science Foundation of Guangdong Provincehttp://dx.doi.org/10.13039/501100003453

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