Abstract
We explore critical factors that can explain the oxygen exchange rate of perovskite-oxide cathode in solid oxide fuel cell (SOFC). It has been said that the bulk ionic conductivity is strongly related to the oxygen exchange rate, while the electronic conductivity is not as far as it is high enough. However, we found that the combination of ionic and electronic conductivities shows much stronger correlation than ionic conductivity alone while analyzing experimental data reported in the literature. Materials which have high oxygen exchange rate can be explained by the product of bulk ionic and electronic conductivities while others by the ionic conductivity alone.
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