Abstract
Electrolyte films of scandia-stabilized zirconia (ScSZ) on NiO-ScSZ anode substrates with approximately 16 mm diameter were successfully fabricated using electrophoretic deposition (EPD) techniques and subsequent co-firing processes. The ScSZ films obtained were 5-8 μm thick, and were dense enough as a solid oxide fuel cell (SOFC) electrolyte. The results of single-cell tests with a lanthanum strontium manganite (LSM) cathode revealed: (i) the observed open-circuit voltage (OCV) values confirmed the ScSZ film to be dense enough as an SOFC electrolyte; and (ii) the anode ohmic and polarization losses did not change at fuel utilizations from 15% to 81%, indicating that the anode microstructure is well fabricated. Furthermore, no degradation in cell performance was observed over 50 h at 80% fuel utilization. The power densities at a constant potential of −500 mV versus OCV were 525 and 440 mW/cm2 at 800 and 750°C, respectively, at low (15%) fuel utilization.
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