Characterization of SmBaCoFeO5+δ−Ce0.9Gd0.1O1.95 composite cathodes for intermediate-temperature solid oxide fuel cells

✍ Scribed by Shiquan Lü; Guohui Long; Yuan Ji; Xiangwei Meng; Cuicui Sun

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 854 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.05.058

✦ Synopsis

The performance of SmBaCoFeO 5þd (SBCF)exCe 0.9 Gd 0.1 O 1.95 (GDC) (x ¼ 0, 10, 30, 50, 60, wt%) composite cathodes has been investigated for their potential utilization in intermediatetemperature solid oxide fuel cells (IT-SOFCs). The powder X-ray diffraction (XRD), thermal expansion coefficient (TEC) and electrochemical property measurements are employed to study the materials. The XRD results prove that there is no serious reaction between SBCF and GDC oxides even at 1000 C. The thermal expansion behavior shows that the TEC value of SBCF cathode decreases greatly with GDC addition. The addition of GDC to SBCF cathode further reduces the polarization resistance. The lowest polarization resistance of 0.036 U cm 2 is achieved at 800 C for SBCFe50GDC composite cathode. An electrolytesupported fuel cell is prepared using SBCFe50GDC as cathode and NiOeGDC (65:35 by weight) as anode. The cell generates good performance with the maximum power density of 691 mW cm À2 , 503 mW cm À2 and 337 mW cm À2 at 800 C, 750 C and 700 C, respectively.

Preliminary results indicate that SBCFe50GDC is especially promising as a cathode for IT-SOFCs.