Abstract
A double-perovskite Sr2FeMoO6 (SFMO) has been synthesized with a combined citrate-EDTA complexing method. The material shows a double-perovskite structure after reduction in 5% H2/Ar at 1100°C for 20h. A single fuel cell using this material as anode is constructed with the configuration of SFMOǀLa0.8Sr0.2Ga0.83Mg0.17O3ǀBa0.5Sr0.5Co0.8Fe0.2O3. The cell exhibits a remarkable electrochemical activity in both H2 and dry CH4, respectively. With Oxygen as oxidant, the maximum power density is 863.7mWcm−2 with H2 as the fuel and 604.8mWcm−2 with dry CH4 as the fuel at 850°C, respectively. SFMO has an almost linear thermal expansion coefficient from 30 to 900°C and is very close to that of La0.8Sr0.2Ga0.83Mg0.17O3. A durability test of the single cell indicates that SFMO is stable in dry CH4 operation. Therefore SFMO can be recommended as a promising anode material for LaGaO3-based solid oxide fuel cells operating with both H2 and dry CH4.
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