The performance of nanoscaled Ba0.5Sr0.5Co 0.8Fe0.2O3-δ (BSCF) thin-film cathodes was investigated by electrochemical impedance spectroscopy (EIS). Thin-film cathodes derived by metal-organic deposition on Ce0.9Gd 0.1O1.95 electrolyte pellets exhibited a film thickness of <100 nm. Performance evaluations of the nanoscaled BSCF thin-film cathodes were systematically conducted on symmetrical cells by EIS with varying temperatures and oxygen partial pressures in the range of 500-625°C and 0.01-0.5 atm, respectively. The impedance data were then analyzed by calculating the distribution of relaxation times (DRT) and by complex nonlinear least squares fitting. Five independent processes associated with the cathode reaction were identified. Area-specific polarization resistances as low as 39 mωcm2 were measured at 600°C.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry