In situ synchrotron x-ray studies of dense thin-film strontium-doped lanthanum manganite solid oxide fuel cell cathodes.
Using a model cathode-electrolyte system composed of epitaxial thin-films of La{sub 1-x}Sr{sub x}MnO{sub 3-{delta}} (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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 951054
- Report Number(s):
- ANL/MSD/CP-63763
- Country of Publication:
- United States
- Language:
- ENGLISH
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