La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) powder was prepared by glycine-nitrate combustion method. The electrochemical properties of porous LSCF cathodes and LSCF-Gd0.1Ce0.9O1.95 (GDC) composite cathodes were evaluated at intermediate/low temperatures of 500-700 °C. The polarization resistance of pure LSCF cathode sintered at 975 °C for 2 h was 1.20 Ω cm2 at 600 °C. The good performance of pure LSCF cathode is attributed to its unique microstructure-small grain size, high porosity and large surface area. The addition of GDC to LSCF cathode further reduced the polarization resistance. The lowest polarization resistance of 0.17 Ω cm2 was achieved at 600 °C for LSCF-GDC (40:60 wt%) composite cathode. An anode-supported solid oxide fuel cell (SOFC) was prepared using LSCF-GDC (40:60 wt%) composite as cathode, GDC film (49-μm-thick) as electrolyte, and Ni-GDC (65:35 wt%) as anode. The total electrode polarization resistance was 0.27 Ω cm2 at 600 °C, which implies that LSCF-GDC (40:60 wt%) composite cathode used in the anode-supported SOFC had a polarization resistance lower than 0.27 Ω cm2 at 600 °C. The cell generated good performance with the maximum power density of 562, 422, 257 and 139 mW/cm2 at 650, 600, 550 and 500 °C, respectively.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology