Fabrication and Characteristics of Anode-Supported Flat Tubular SOFC

An anode-supported flat tubular solid oxide fuel cell was fabricated to increase the cell power density and thermal stability by combining the merits of tubular and planar type cell structure. An anode-supported flat tube was fabricated by extrusion process. The porosity and pore size of the flat anode tube were 50.6% and 0.23 μm, respectively. The Ni particles were distributed uniformly and connected well in the cermet. A YSZ electrolyte layer with gas tightness was produced by slurry dipping process. The anode-supported flat tube cell showed cell performance of 225 mW/cm 2 (0.6V, 375 mA/cm 2 ) and operated for 300 h without degradation in cell performance. As ceramic interconnect for flat-tube cell stack, La 0.75 Ca 0.27 CrO 3 was synthesized by the Pechini method and coated onto the anode substrate in the form of a narrow band by plasma spray; a dense ceramic interconnection layer was obtained. Fe-16Cr alloy coated with LSM ((La 0.85 Sr 0.15 ) 0.9 MnO 3 ) as metallic interconnector indicated good sinterability in Ar+10% H 2 atmosphere, which had areal specific resistance of 148 mΩ cm 2 at 750°C in air which decreased to 43 mΩ cm 2 after 450 h. We obtained basic technology for an anode-supported flat tubular cell through this work. By using the flat tube cells, we designed and fabricated the anode-supported flat tube stack with high power density.