Strontium effect of lanthanum doped ordered Perovskite composite cathode on electrochemical characteristics for IT-SOFCs

Abstract

The effects of Sr substitution for Ba on the structural properties, electrical conductivity, and electrochemical performance of a cation-ordered perovskite LaBaCo2O5+δ(LBCO) oxide have been investigated as a cathode material for IT-SOFC applications. The electrical conductivity of LaBa0.5Sr0.5Co2O 5+δ (LBSCO) is much higher than that of Sr-free LBCO. The minimum area specific resistance value is achieved at LBSCO composite with 40 wt % Ce0.9Gd0.1O2+δ (GDC). The best performance of LBSCO-40GDC based on a GDC electrolyte reaches 1.254 W cm-2 at 600 °C. Therefore, the ordered perovsikte structure, LBSCO-40GDC, is a potential candidate cathode material in IT-SOFC applications.