Novel SrTixCo1−xO3−δ cathodes for low-temperature solid oxide fuel cells

✍ Scribed by Zhan Gao; Zongqiang Mao; Cheng Wang; Zhixiang Liu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 910 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2011.02.074

✦ Synopsis

The SrTi x Co 1Àx O 3Àd (STC, x ¼ 0.05, 0.1, 0.15, 0.2) perovskite-type oxides synthesized by the polymerized complex (PC) method have been investigated as cathode materials for lowtemperature solid oxide fuel cells (SOFCs) with composite electrolyte for the first time.

Thermogravimetryedifferential thermal analysis (TGeDTA) shows the crystallization of SrTi 0.1 Co 0.9 O 3Àd occurs at 780 C. The oxides have been stabilized to be a cubic perovskite phase after the B-site is doped with Ti ion. The maximum power density reaches as high as 613 mW cm À2 at 600 C for SOFC with SrTi 0.2 Co 0.8 O 3Àd cathode. The maximum power densities increase with the increasing Ti content in the cathode, which can be attributed to the enhancement of conductivity and electrocatalytic activity. The stability of the fuel cell with SrTi 0.1 Co 0.9 O 3Àd cathode has been examined for 18 h at 600 C. Only a slight decline in the cell performance can be observed with increasing time. The high performance cathodes together with the low-cost fabrication technology are highly encouraging for development of low-temperature SOFCs.