Preparation and Performance of Sr2-xPrxFe1.5Mo0.5O6-δ Cathode Materials for Solid Oxide Fuel Cell
Cathode material of Sr2-xPrxFe1.5Mo05O6-δ(x=0～0.1)for solid oxide fuel cells(SOFCs)was prepared by solution combustion method.Its phase structure,electrochemical properties,chemical stability and thermal compatibility with electrolyte materials were studied.The results show that Sr2_xPrxFe1.5Mo0.5O6-δ has a typical dou-ble-perovskite structure when Sr element in Sr2Fe1.5Mo0.5O6 is partially replaced by Pr.There is a good chemical stability and a thermal expansion compatibility between Sr2-xPrxFe1.5Mo0.5O6-δ cathode and Ce0.8Gd02O1.9 electrolyte.The conductivity of Sr2-xPrxFe1.5Mo0.5O6-δ can be improved while the polarization resistance is reduced by doping with appropriate amount of Pr.The conductivity of Sr1.95Pr0 05Fe1.5Mo0.5O6-δ can reach the maximum value of 32.0 S·cm-1 at 450 ℃,while having the lowest polarization resistance of 0.266 Ω·cm2.Therefore,Sr2-xPrxFe1.5Mo0.5O6-δ can be used as a potential cathode material for medium temperature solid oxide fuel cells.
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