A-Site Deficient (Pr(0.6)Sr(0.4))(1-s)Fe(0.8)Co(0.2)O(3-delta) Perovskites as Solid Oxide Fuel Cell Cathodes

作者：Hansen K Kammer^*

来源：Journal of the Electrochemical Society, 2009, 156(10): B1257-B1260.

DOI：10.1149/1.3194786

Five A-site deficient (Pr(0.6)Sr(0.4))(1-s)Fe(0.8)Co(0.2)O(3-delta) perovskites (s = 0.01, 0.05, 0.10, 0.15, and 0.20) were synthesized using the glycine-nitrate process. The perovskites were characterized with powder X-ray diffraction (XRD), dilatometry, four-point dc conductivity measurements, and electrochemical impedance spectroscopy using cone-shaped electrodes on a Ce(0.9)Gd(0.1)O(1.95) electrolyte. XRD revealed that only the compounds with s=0.01 and 0.05 were of single phase. The other compounds contained an additional phase in the form of a Co-Fe spinel. The thermal expansion coefficient decreased systematically with an increase in s. The total conductivity followed the small polaron hopping process below a certain characteristic temperature. The total conductivity decreased with increasing s. It was likewise shown that the polarization resistance found a minimum for the compound with s=0.05, with a total area specific resistance more than 3 times lower than the weakly A-site deficient (Pr(0.6)Sr(0.4))(1-s)Fe(0.8)Co(0.2)O(3-delta) perovskite.

• 出版日期2009