SmBaCo2O5+x double-perovskite structure cathode material for intermediate-temperature solid-oxide fuel cells

✍ Scribed by Qingjun Zhou; Tianmin He; Yuan Ji

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 536 KB
• Volume: 185
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2008.07.064

✦ Synopsis

SmBaCo 2 O 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 815-434 S cm -1 in the temperature range 500-800 • C. 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-ı (LSGM). The polarization resistances of an SBCO cathode on SDC and LSGM electrolytes are 0.098 and 0.054 cm 2 at 750 • C, 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 • C, 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.