Thin Yttrium‐Stabilized Zirconia Electrolyte Solid Oxide Fuel Cells by Centrifugal Casting

A centrifugal casting technique was developed for depositing thin 8‐mol%‐yttrium‐stabilized zirconia (YSZ) electrolyte layers on porous NiO‐YSZ anode substrates. After the bilayers were cosintered at 1400°C, dense pinhole‐free YSZ coatings with thicknesses of ∼25 μm were obtained, while the Ni‐YSZ retained porosity. After La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF)‐Ce 0.9 Gd 0.1 O 1.95 (GDC) or La 0.8 Sr 0.2 MnO 3 (LSM)‐YSZ cathodes were deposited, single SOFCs produced near‐theoretical open‐circuit voltages and power densities of ∼1 W/cm 2 at 800°C. Impedance spectra measured during cell tests showed that polarization resistances accounted for ∼70%–80% of the total cell resistance.