Abstract A general procedure for the extrusion of Ce 0.8 Gd 0.2 O 1.9 tubular electrolytes is detailed. Using a commercial water-based binder system, Ce 0.8 Gd 0.2 O 1.9 was extruded, then fired at 1600°C to form high-density electrolyte tubes (98% relative to theoretical). Heat-treatment of the Ce 0.8 Gd 0.2 O 1.9 powder at 900°C for 4 h yielded tubes that were highly dense with a smooth surface finish, while non heat-treated powders resulted in an extrusion that was less dense with poor surface finish. Electrodes were applied and the tubular SOFC was electrically tested. A good open circuit voltage of 0.911 V was achieved for the cell, however a poor operating current density of 0.0123 A/cm 2 at 0.7 V was obtained. The results demonstrate the potential of fabricating and operating tubular SOFCs.
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