Development and Characterization of Cathode-Supported SOFCs by Single-Step Cofiring Fabrication for Intermediate Temperature Operation

摘要

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{sub}0.9Gd{sub}0.9O{sub}1.95 (GDC) electrolyte with a NiO-GDC anode on a porous La{sub}0.6Sr{sub}0.4Co{sub}0.2Fe{sub}0.8O{sub}(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℃. 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{sub}2-Ar (3% H{sub}2O) produced the maximum power densities of 0.09 Wcm{sup}(-2), 0.08 Wcm{sup}(-2), and 0.05 Wcm{sup}(-2), at 600℃, 550℃, and 500℃, respectively.