Perovskite titanate anodes for SOFCs

FUEL 274

John TS Irvine, jtsi@st-and.ac.uk, Juan Carlos Ruiz Morales, jcr7@st-andrews.ac.uk, and Jesus Canales Vasquez, Jesús Canales . School of Chemistry, University of St Andrews, North Haugh, Fife, St Andrews, KY16 9ST, United Kingdom
The defect chemistry of perovskite materials is rich with diverse possibilities including A-site deficiency, oxygen deficiency, layer intergrowth and intergrowth of the K2NiF4 structure type or of oxygen excess AnBnO3n+2. Such perovskites offer a range of possible functions for fuel cell fuel electrodes. The best results to date have been achieved for systems with nominal oxygen excess where very low polarisation resistances have been obtained through manganese and gallium doping of lanthanum strontium titanate. Polarisation resistances as low as 0.1 µŮ cm2 have been reported as have very high activities for methane oxidation with open circuit potentials as high as 1.4 V.