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In situ Synchrotron X-ray Studies of Dense Thin-Film Strontium-Doped Lanthanum Manganite Solid Oxide Fuel Cell Cathodes

Published online by Cambridge University Press:  01 February 2011

Kee-Chul Chang ,
Brian Ingram ,
Balasubramaniam Kavaipatti ,
Bilge Yildiz ,
Daniel Hennessy ,
Paul Salvador ,
Nadia Leyarovska  and
Hoydoo You
Kee-Chul Chang
Affiliation:
kcchang@anl.gov, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
Brian Ingram
Affiliation:
ingram@anl.gov, Argonne National Laboratory, Chemical Sciences and Engineering Division, Argonne, Illinois, United States
Balasubramaniam Kavaipatti
Affiliation:
bk@andrew.cmu.edu, Carnegie Mellon University, Department of Materials Science and Engineering, Pittsburgh, Pennsylvania, United States
Bilge Yildiz
Affiliation:
byildiz@mit.edu, Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, Cambridge, Massachusetts, United States
Daniel Hennessy
Affiliation:
hennessy@anl.gov, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
Paul Salvador
Affiliation:
paul7@andrew.cmu.edu, Carnegie Mellon University, Department of Materials Science and Engineering, Pittsburgh, Pennsylvania, United States
Nadia Leyarovska
Affiliation:
nadial@anl.gov, Argonne National Laboratory, X-ray Science Division, Argonne, Illinois, United States
Hoydoo You
Affiliation:
you@anl.gov, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
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Abstract

Using a model cathode-electrolyte system composed of epitaxial thin-films of La1-xSrxMnO3-δ (LSM) on single crystal yttria-stabilized zirconia (YSZ), we investigated changes in the cation concentration profile in the LSM during heating and under applied potential using grazing incidence x-rays. Pulsed laser deposition (PLD) was used to grow epitaxial LSM(011) on YSZ(111). At room temperature, we find that Sr segregates to form Sr enriched nanoparticles and upon heating the sample to 700°C, Sr is slowly reincorporated into the film. We also find different amounts of Sr segregation as the X-ray beam is moved across the sample. The variation in the amount of Sr segregation is greater on the sample that has been subject to 72 hours of applied potential, suggesting that the electrochemistry plays a role in the Sr segregation.

Keywords

x-ray fluorescenceionic conductorSr
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S08-10
Copyright
Copyright © Materials Research Society 2009

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References

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