| 초록 |
The layered perovskite oxide, PrBaCo2O5+δ have received interest as a promising cathode for the solid oxide fuel cells due to their high oxygen kinetic and conductivity. Generally, doping A or/and B site on the perovskite oxide can be considered as a method to improve its performance. In this study, we investigated the structural, electrical, electrochemical changes of PrBa1-xCaxCo2O5+δ (x = 0, 0.1, 0.2, 0.3, and 0.4), (PBCC). The layered structure of the PBCCO can be sustained up to x = 0.2. Above the x = 0.2, the layered structure collapsed to the simple perovskite. Interestingly, we found that the simple and layered structure were co-existed between complete layered and simple perovskite structure at the x = 0.3. The electrical conductivity, catalytic activity, and electro-chemical performance of the PBCCO increase with increasing Ca dopant for the layered perovskite, while the decrease in these appears after the simple perovskite structure has been formed. |
