The cathodic reaction mechanism of a solid oxide fuel cell (SOFC) was investigated for an electrode-electrolyte system of La0.6Ba0.4CoO3 (LBC)-BaCeO3, under both the O2- conducting and H+/O2- mixed-ionic conducting conditions. AC impedance measurements were carried out, and the electrode interfacial conductivities were calculated. The experimental results revealed that the processes dominating the electrode resistance for the O2- conducting and the H+/O2- mixed-ionic conducting conditions are different. It was also found that the process dominating the electrode resistance changes at 700 °C under H+/O2- mixed-ionic conducting conditions. The process dominating the electrode resistance above 700 °C is postulated to be the reaction OLBC+HLBC→OHLBC. LBC showed high-performance cathode characteristics for a SOFC using BaCeO3 electrolyte.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry