Direct CH_4 fuel cell using Sr_2FeMoO_6 as an anode material

摘要

ABSTRACT A double-perovskite Sr_2FeMoO_6 (SFMO) has been synthesized with a combined citrate-EDTA com-plexing method. The material shows a double-perovskite structure after reduction in 5% H_2/Ar at 1100℃ for 20h. A single fuel cell using this material as anode is constructed with the configuration of SFMOlLao.8Sro.2Gao.83Mgo.17O3IBao.5Sro.5Coo.sFeo.2O3. The cell exhibits a remarkable electrochemical activity in both H_2 and dry CH4, respectively. With Oxygen as oxidant, the maximum power density is 863.7mWcm-2 with H_2 as the fuel and 604.8 mWcnr2 with dry CH_4 as the fuel at 850°C, respectively. SFMO has an almost linear thermal expansion coefficient from 30 to 900 ℃ and is very close to that of La_(0.8)Sr_(0.2)Ga_(0.83)Mg_(0.17)O_3. A durability test of the single cell indicates that SFMO is stable in dry CH_4 operation. Therefore SFMO can be recommended as a promising anode material for LaGaO_3 -based solid oxide fuel cells operating with both H_2 and dry CH_4.