Electrochemical Performance of La_(0.6)Sr_(0.4)Ti_xFe_(1-x)O_3-Based Composite Cathode Materials for Solid Oxide Fuel Cells

摘要

We developed a new cathode material for solid oxide fuel cells containing a composite of La_(0.6)Sr_(0.4)Ti_xFe_(1-x)O_(3-δ) (0 ≤ x ≤ 0.4) (LSTF) and La_(0.6)Sr_(0.4)Co_yFe_(1-y)O_(3-δ) (0 ≤ y ≤ 1) (LSCF). Here, we report the results of our performance evaluation of this cathode material. The optimum composition for the composite cathode material was determined to be LSCF 70 wt%-LSTF 30 wt%. Cathodes with this optimum composition exhibited neither fracture nor delamination from the electrolyte during thermal cycling between 200 and 700°C. The developed cathode material also exhibited high power density.