Electrochemical investigation of composite cathodes with SmBa 0.5Sr0.5Co2O5-δ cathodes for intermediate temperature-operating solid oxide fuel cell

Abstract

The electrochemical characteristics of the samarium and strontium doped layered perovskite (SmBa1-xSrxCo2O 5-δ, x = 0.5) have been investigated for possible application as a cathode material for an intermediate temperature-operating solid oxide fuel cell (IT-SOFC). The cathodic polarization of single-phase and composite cathodes with 10 mol % gadolinia-doped ceria (Ce0.9Gd 0.1O2-δ, CGO91) shows that a weight ratio between SmBa0.5Sr0.5Co2O5+δ (SBSCO) and CG091 of 1:1 (50 wt % SBSCO and 50 wt % CGO91, SBSCO:50) gives the lowest area specific resistance (ASR) of 0.10 Ω cm2 at 600 °C and 0.013 Ω cm at 700 °C. The maximum and minimum electrical conductivity in SBSCO are 1280 S cm-1 at 50 °C and 2..