Abstract
Electrode materials with improved polarization characteristics are required for a reduction in the operating temperature of solid oxide fuel cells (SOFC) to be technologically feasible. Oxide cathode materials that possess a high degree of oxide ion conductivity as well as electronic conductivity are expected to exhibit lower values of electrode polarization than current cathode materials with negligible ionic conductivity. Some perovskite oxides based on the system La{sub 1{minus}x}Sr{sub x}Fe{sub 1{minus}y}Co{sub y}O{sub 3} have been shown to possess a significant amounts of ionic conductivity by {sup 18}O/{sup 16}O isotopic exchange and dynamic secondary ion mass spectrometry (SIMS) investigations. AC impedance spectroscopy has been used to examine the electrode polarization behavior of these oxides as a function of temperature and oxygen partial pressure. This behavior has been modelled and attributed to definite ionic charge and mass transfer mechanisms.
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