| Summary: | Layered perovskite oxides are considered as promising cathode materials for the solid oxide fuel cell (SOFC) due to their high electronic/ionic conductivity and fast oxygen kinetics at low temperature. Many researchers have focused on further improving the electrochemical performance of the layered perovskite material by doping various metal ions into the B-site. Herein, we report that Sc<sup>3+</sup> doping into the layered perovskite material, PrBaCo<sub>2</sub>O<sub>5+<i>δ</i></sub> (PBCO), shows a positive effect of increasing electrochemical performances. We confirmed that Sc<sup>3+</sup> doping could provide a favorable crystalline structure of layered perovskite for oxygen ion transfer in the lattice with improved Goldschmidt tolerance factor and specific free volume. Consequently, the Sc<sup>3+</sup> doped PBCO exhibits a maximum power density of 0.73 W cm<sup>−2</sup> at 500 °C, 1.3 times higher than that of PBCO. These results indicate that Sc<sup>3+</sup> doping could effectively improve the electrochemical properties of the layered perovskite material, PBCO.
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