Smbaco_2o_(5+x) Double-perovskite Structure Cathode Material For Intermediate-temperature Solid-oxide Fuel Cells

摘要

SmBaCo_2O_(5+x) (SBCO), an oxide with double-perovskite structure, has been developed as a novel cathode material for intermediate-temperature solid-oxide fuel cells (IT-SOFCs). The electrical conductivity of an SBCO sample reaches 815-434S cm~(-1) in the temperature range 500-800℃. XRD results show that an SBCO cathode is chemically compatible with the intermediate-temperature electrolyte materials Sm_(0.2)Ce_(0.8)O_(1.9)(SDC) and La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM). The polarization resistances of an SBCO cathode on SDC and LSGM electrolytes are 0.098 and 0.054 Ω cm~(-2) at 750℃, respectively. The maximum power densities of a single cell with an SBCO cathode on SDC and LSGM electrolytes reach 641 and 777 mW cm~(-2) at 800℃, respectively. The results of this study demonstrate that the double-perovskite structure oxide SBCO is a very promising cathode material for use in IT-SOFCs.