In this study, a single-step cofiring through the extrusion molding and wet-ceramic coating technique was developed to fabricate a cathode-supported microtubular cell. The cell is consisting of a Ce 0.9 Gd 0.1 O 1.95 (GDC) electrolyte with a NiO-GDC anode on a porous La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ/GDC tube (460 μm wall thickness and 2.26 mm diameter). Densification of the ceria membrane (thickness <20 μm) was successful by cosintering the laminated thin electrolyte and the anode with the cathode at 1200°C. Compared with that fabricated by the conventional two-step cofiring process, the cell showed an improved performance due to the increased anode sintering temperature, which leads to an improved anode /electrolyte interfacial property. The cell having 2 cm tube length fed with humidified 30 vol % H 2-Ar (3% H 2O) produced the maximum power densities of 0.09 W cm 2, 0.08 W cm -2, and 0.05 W cm -2, at 600°C, 550°C, and 500° C, respectively.
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