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  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Reactions at the interface La0.5Ca0.5MnO3-YSZ/Al2O3 under anodic current (1996)
    Springer
    Ionics 2 (1996), S. 184-189 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction at the interface of a solid electrolyte cell between air electrode (La0.5Ca0.5MnO3) and YSZ-electrolyte with different Al2O3-contents was investigated by electron microscopy (SEM) and x-ray diffraction (XRD). Formation of MnAl2O4 was detected in a 5 µm diffusion zone within the electrolyte. MnAl2O4 formation can be explained by diffusion of Mn-ions into the electrolyte and subsequent reaction with the α-Al2O3 grains during sintering. Cell performance and long-term stability in SOFC operation are not negatively affected by MnAl2O4 formation. However a rise in electrode resistance and slow delamination of perovskite oxide electrode were observed after some hours of electrolysis. This reaction is the consequence of oxygen gas pressure at the electrolyte in the MnAl2O4 diffusion zone. It is caused by local increase of electronic conductivity by MnAl2O4 formation. Long-term stability also for electrolysis conditions has been achieved by an additional intermediate YSZ-layer between air electrode and electrolyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02376019
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation techniques and materials for long term stable SOFC - Single cell membranes (1997)
    Springer
    Ionics 3 (1997), S. 143-148 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Chemical reactions and thermal expansion mismatch between electrodes and electrolyte may reduce the long term stability of SOFC-single cells and can cause undesirable thermomechanical stresses. In solid electrolyte cells the formation of MnAl2O4 was detected between the air electrode (La0.5Ca0.5MnO3) and the electrolyte (YSZ/Al2O3) in a 5 µm diffusion zone within the electrolyte. The electronically conducting spinel MnAl2O4 is thought to be the main factor for delamination of the air electrode under anodic current (electrolysis). The performance and long term stability of the air electrode/electrolyte interface can be improved for electrolysis conditions by an additional intermediate YSZ-layer made by sol-gel technique. The mismatch in thermal expansion between the electrode materials and the electrolyte have been eliminated via optimized doping and by adding small amounts of a silicate-based substituent with a very low thermal expansion co-efficient for the cathode and anode, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375538
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