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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_2018_SSI_Interfaceformation_AAM.pdf (3.539Mb)
Date
01/11/2018
Author
He, Shuai
Chen, Kongfa
Saunders, Martin
Quadir, Zakaria
Tao, Shanwen
Irvine, John T.S.
Cui, C.Q.
Jiang, San Ping
Keywords
Solid oxide fuel cells
Direct assembly
LSM cathodes
YSZ and GDC electrolyte
Interface
Mn segregation
QD Chemistry
NDAS
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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.
Citation
He , S , Chen , K , Saunders , M , Quadir , Z , Tao , S , Irvine , J T S , Cui , C Q & Jiang , S P 2018 , ' Interface formation and Mn segregation of directly assembled La 0.8 Sr 0.2 MnO 3 cathode on Y 2 O 3 -ZrO 2 and Gd 2 O 3 -CeO 2 electrolytes of solid oxide fuel cells ' , Solid State Ionics , vol. 325 , pp. 176-188 . https://doi.org/10.1016/j.ssi.2018.08.016
Publication
Solid State Ionics
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.ssi.2018.08.016
ISSN
0167-2738
Type
Journal article
Rights
© 2018 Published by Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1016/j.ssi.2018.08.016
Description
This work was financially supported by the Australian Research Council under the Discovery Project Scheme (project numbers: DP180100731 and DP180100568), and by the Guangdong Provincial Department of Science and Technology Agency (GDST) under the GDST-NOW Science-Industry Cooperation Program (No. 2017A050501053).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/18398

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