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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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    Access Status
    Open access
    Authors
    He, S.
    Chen, K.
    Saunders, M.
    Quadir, Z.
    Tao, S.
    Irvine, J.
    Cui, C.
    Jiang, San Ping
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    He, S. and Chen, K. and Saunders, M. and Quadir, Z. and Tao, S. and Irvine, J. and Cui, C. et al. 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.
    Source Title
    Solid State Ionics
    DOI
    10.1016/j.ssi.2018.08.016
    ISSN
    0167-2738
    School
    Fuels and Energy Technology Institute
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100568
    http://purl.org/au-research/grants/arc/DP180100731
    URI
    http://hdl.handle.net/20.500.11937/72631
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 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.

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