A study on aging-induced conductivity-decrease mechanism in stabilized zirconia through optical property measurements

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Stabilized zirconia is one of the most promising solid electrolyte in solid oxide fuel cell. Nevertheless, it suffers aging-induced conductivity decrease, time-dependent degradation at its high operating temperature. Suppression of the effect is known to be achieved by adding scandium or indium oxides. On the other hand, oxygen vacancies diffusing in ionic conduction reflect their structural changes in the electronic structures, which are confirmed by photoluminescence spectra. This research project investigates degradation and suppression mechanism of aging in oxides through optical property measurements.