Abstract
Relationship between microstructure and performance of Sr-doped LaMnO3 (LSM)/Sc2O3-stabilized ZrO2 (ScSZ) composite cathodes was investigated using equivalent circuit models (ECMs) analysis. The cathodes were prepared by impregnating prefabricated porous ScSZ layers with a LSM/ScSZ powder slurry. This method enabled control of the electrolyte surface roughness. Three different ECMs were used for analysis: (i) commonly used ECM in which resistances were connected in series; (ii) ECM consisting of the double-phase boundary (DPB) and the triple-phase boundary (TPB) at the LSM/ScSZ interface; and (iii) ECM representing a three-dimensional electrode. The analysis revealed that impedance response is influenced by the area ratio of the DPB to the TPB although cathode performance is mainly determined by the TPB.
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