Abstract
A new YxBa2-xCo2O5+δ cathodes were successfully prepared by solid-state reaction method. The structure, microstructure, conductivity, coefficient of thermal expansion and electrochemical properties of these YxBa2-xCo2O5+δ cathodes were conducted by XRD, SEM, 4 DC four-terminal method, thermomechanical analysis and AC impedance, respectively. The YBaCo2O5+δ is a single phase with double perovskite structure. The second phases of YBa2Co3O9-δ and Y2O3 were observed as the x>1 and x<1, respectively. The conductivity of all YxBa2-xCo2O5+δ amples increased as temperature increased, and show a p-type conductor characterization. The YBaCo2O5+δ exhibited a maximum conductivity of 256 S/cm at 300 oC. The coefficient of thermal expansion is 13.8*10-6, which is close to that of Samaria-doped Ceria (SDC) electrolyte. The YBaCo2O5+δdid not react with SDC electrolyte below 1050 oC. The YBaCo2O5+δ is a potential cathode material for intermediate temperature solid oxide fuel cell.
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