An Electrolyte-supported SOFC Stack Fabricated by Slip Casting Technique

Cone-shaped YSZ electrolyte cylinders with a wall thickness of less than 0.2 mm were fabricated using slip casting technique. Single solid oxide fuel cell (SOFC) units were made by applying La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)- Ce0.9Gd0.1O1.95 (GDC) cathode material on the outside of the cylinders and NiO-GDC anode on the inside. A three-cell-stack was assembled by connecting the cone-shaped SOFC units in electrical series via metallic interconnects and seals. The open circuit voltage (OCV) of the three-cell-stack was 2.9 V and the maximum power was over 0.9 W at 800°C with humidified hydrogen as fuel and the ambient air as oxidant. Analysis of the impedance spectrum suggests that there is still potential to raise the stack output by improving the electrode performance