Cathodes prepared by infiltration of La0.6Sr0.4CoO3d (LSC40) into a porous Ce0.9Gd0.1O1.95 (CGO10) backbone have been developed
for low temperature solid oxide fuel cells. The CGO10 backbone has been prepared by screen printing a CGO10 ink on both
sides of a 180 m dense CGO10 electrolyte-tape followed by firing. LSC40 was introduced into the CGO10 porous backbone by
multiple infiltrations of aqueous nitrate solutions followed by firing at 350C. A systematic study of the performance of the cathodes
was performed by varying the CGO10 backbone firing temperature, the LSC40 firing temperature and the number of infiltrations.
The cathode polarization resistance was measured using electrochemical impedance spectroscopy on symmetrical cells in
ambient air, while the resulting structures were characterized by scanning electron microscopy (SEM) and high temperature X-ray
diffraction (HT-XRD). The firing temperature of 600C for the LSC40 infiltrate was found to provide a balance between LSC40
material formation and high surface area micro=nanostructure. The lowest polarization resistances measured at 600 and 400C
were 0.044 and 2.3 X cm2 in air, respectively. During degradation tests at 600C, the cathode polarization resistance levels out after
about 450 h of testing, giving a final polarization resistance of 0.07 X cm2.
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