Nanoscaled Ba0.5Sr0.5Co0.8Fe 0.2O3-δthin-film cathodes deposited by spin-coating followed by pyrolysis of the metal organic precursors (the metal organic deposition [MOD] process) with a film thickness below 100 nm on Ce 0.9Gd0.1O1.95electrolyte pellets were investigated with a focus on the cathode reaction processes. Electrochemical impedance spectroscopy was carried out under systematic variation of the temperature (T = 500-625 °C) and oxygen partial pressure (pO2 = 0.01-0.5 atm). The impedance data were then analyzed by calculating the distribution of relaxation times (DRT) and performing complex nonlinear least squares (CNLS) fitting. Five processes were identified in the cathode reaction. Area specific polarization resistances as low as ASRpol = 39 mω cm 2 at 600 °C were found.
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