Abstract
In this study, four pyrochlore oxides such as (Gd0.9Ca0.1)2Ti2O7-δ, Gd2(Ti0.8Ru0.2)2O7-δ, (Sm0.9Ca0.1)2Ti2O7-δ, and (Y0.9Ca0.1)2Ti2O7-δ were investigated as new mixed ionic and electronic conductors for SOFC anodes. Cermets of nickel and the pyrochlores were fabricated as an anode, and current-voltage (I-V) characteristics were evaluated using yttria-stabilized zirconia and lanthanum manganite as an electrolyte and cathode, respectively. It was found that ohmic resistance and polarization resistance for the anodic reaction over some of the Ni-pyrochlore cermet anodes were smaller than those of Ni-YSZ, whereas the polarization resistance stemming from gas diffusion in the anode was significantly large over the pyrochlore anodes, leading to inferior I-V characteristics to Ni-YSZ. To improve the anode structure for better gas diffusion, pyrochlore oxides were prepared by solid-state synthesis method. The anode using these pyrochlore oxides exhibited smaller gas diffusion resistance and comparable I-V characteristics with Ni-YSZ anode.
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