| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 209421 | Fuel Processing Technology | 2015 | 4 Pages |
•Performance degradation was related with surface chemistry for LSCF–SDC cathodes.•Performance degradation was mainly caused by low frequency mass transfer process.•Sr segregation on the surface was suppressed by lowering oxygen partial pressure.
The stability and surface composition of La0.6Sr0.4Co0.2Fe0.8O3 − δ (LSCF)–Sm0.2Ce0.8O2 (SDC) cathodes prepared by impregnation are investigated at 750 °C under open circuit and different oxygen partial pressures. The performance degradation during the test at Po2 = 0.21 atm is closely related to the low frequency mass transfer process. Little change of the electrochemical performance of cathodes is observed after 24 h test at Po2 = 0.001 atm. XPS patterns show that the decrease in oxygen partial pressure leads to the suppression of Sr enrichment on the surface of cathodes and retards the performance degradation.
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