Abstract
Sm0.5Sr0.5Co0.8M0.2O3-δ (M=Fe,Mn,Cu) cathodes has been successfully prepared by solid-statereaction method in this research. In order to improved the electrocatalytic properties of Sm0.5Sr0.5CoO3-δ (SSC), the different metal ions doped on the B-site of SSC. The structure and surface morphology were examined by XRD and SEM. The electrochemical properties were characterized by electrochemical impedance spectroscopy (EIS) technique. The electrical conductivity results showed that Sm0.5Sr0.5Co0.8Fe0.2O3-δ had a maximum electronic conductivity, which value is 2.026×10^3 S/cm at 650°C among all specimens. According to the relation between the electronic conductivity and the oxygen vacancies of B-site, it was found that with the increase in the oxygen vacancies, the electrical conductivity was decreased. The electrochemical properties revealed that Sm0.5Sr0.5Co0.8Cu0.2O3-δ possessed the highest exchange current density (i0), the lowest polarization resistance among all specimens due to their high electrocatalytic properties.
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