Abstract
The densification and electrochemical activity for oxygen reduction of the bismuth ruthenate pyrochlores, Bi 2 (Ru 2-x Bi x )O 7-δ (x = 0.0-0.8) synthesized by the Pechini method, have been investigated as the interconnect and cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The substitution of bismuth on the ruthenium site significantly improves the densification process. Some compositions of the pyrochlore family are promising coating materials for metallic interconnects. Anode-supported fuel cells with doped ceria as the electrolyte have been fabricated and tested. Impedance spectra of the fuel cells demonstrate high catalytic activity for oxygen reduction. The area-specific resistance at 600°C is less than 1.0 Ω cm 2 .
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