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The analysis of mixed ionic-electronic conducting (MIEC) cathodes with respect to operation temperature and time is essential for a target-oriented development of anode-supported solid oxide fuel cells (ASCs). This study tracks both issues by impedance spectroscopy on a high-performance cathode with
Factors controlling electronic conduction in oxides are first discussed. Criteria for achieving predominant ionic conduction are then developed. The role of nonstoichiometry in influencing mixed ionic-electronic conductivity, MIEC, is then evaluated, followed by an examination of the impact of MIEC
A composite cathode, consisting of Ba(Zr 0.1 Ce 0.7 Y 0.2 )O 3-Δ± (BZCY) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-Δ± (LSCF), has shown high catalytic activity toward oxygen reduction, demonstrating a peak power density of 855 mW cm -2 at 750 β’ C. The chemical compatibility between BZCY and LSCF is excellen