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Origin of cathodic degradation and new phase formation at the La0.9Sr0.1MnO3/YSZ interface
Cited 78 time in
Web of Science
Cited 91 time in Scopus
- Authors
- Issue Date
- 1999-02-12
- Publisher
- Elsevier
- Citation
- Solid State Ionics 90 (1996) 133
- Keywords
- Lanthanum zirconate ; Cathode degradation in SOFC ; Ohmic losses ; AC impedance ; Current interruption
- Abstract
- New phase formation at the La0.9Sr0.1MnO3/YSZ interface and its effects on the cathodic performances were studied at 900 °C in air. The resistance caused by the interfacial product layer kept increasing with time to reach up to 40% of the total resistance after 500 h. The interfacial product was identified as La2Zr2O7 by XRD measurement. The electrical conductivity of La2Zr2O7 (2.4 × 10−5 S cm−1 at 1000 °C), measured by AC impedance and current interruption methods, was 4 to 7 orders of magnitude smaller than those of La0.9Sr0.1MnO3 electrode or YSZ electrolyte. Either the electronic conductivity or the electrochemical O2 reduction activity of La2Zr2O7 was negligible. Combining these results, a conclusion was made that the cathodic degradation comes mainly from the growth of interfacial product layer and its contribution to the cell resistance increment is ohmic in nature.
- ISSN
- 0167-2738
- Language
- English
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