Abstract
The structural characterization, surface state and electrochemical performances of LnBaCo2O5+δ (LnBC) (Ln = La, Pr, Nd and Sm) perovskite cathode are systematically investigated for intermediate-temperature solid oxide fuel cells. The structural symmetry gradually distorts with the reduced ionic radius. The electrical conductivity decreases due to the increasing oxygen vacancy concentration from La to Sm. X-ray photoelectron spectroscopy analysis indicates that the concentration of oxygen active sites on the surface of LnBC samples decreases with shrinking Ln3+ radius. The increasing Ln–O bond energy leads to the reduction of the thermal expansion coefficients. The electrochemical performance of LnBC electrode decreases with the decreasing Ln3+ ionic radius. This result may be related to the decreasing.
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