Abstract
Fine and uniform La0.6Sr0.4Co0.2Fe0.8O3−δ powder was synthesized by a glycine–nitrate combustion process. La0.6Sr0.4Co0.2Fe0.8O3−δ electrodes were prepared on dense Ce0.8Sm0.2O2−δ electrolyte substrates using a spin-coating technique by sintering at 900–1,000 °C. The electrode properties of La0.6Sr0.4Co0.2Fe0.8O3−δ were investigated by electrochemical impedance spectroscopy and chronopotentiometry techniques with respect to preparation conditions and the resulting microstructures. The results indicate a significant effect of the microstructure on the electrode processes and polarization characteristics. The oxygen adsorption and dissociation process acted as a larger contribution to the overall electrode polarization R p in magnitude compared with the charge transfer process due to relatively low porosity levels of the electrodes. It was detected that the grain size of the electrodes exhibited a crucial role on the electrocatalytic reactivity. At 800 °C, the electrode sintered at 950 °C attained a polarization resistance of 0.18 Ω cm2, an overpotential of 27 mV at a current density of 200 mA cm−2, and an exchange current density of 308 mA cm−2.
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