Electrode Properties and High Temperature Stability of PrNi1-XFexO3 Cathode. (10th July 2019) - Chiba, Reiichi
Abstract : We investigated the use of PrNi1-x Fex O3 (x=0.35-1.0) as an SOFC cathode material. The crystal structure is similar to that of LaNi1-x Fex O3, which is a candidate material for an SOFC cathode. Single phase (orthorhombic phase) PrNi1-x Fex O3 (x=0.35-1.0) cathodes were successfully synthesized with a two-step solid-state reaction consisting of 1300 o C sintering and 800 o C annealing processes. We ascertained that these cathodes were also in a single phase after firing at 1100 o C on a Ce0.9 Gd0.1 O1.95 (GDC) electrolyte and at an operating temperature of 800 o C. The interface resistance of these cathodes was measured with an AC impedance method at 800 o C. The cathodes performed better than those made of LaNi0.6 Fe0.4 O3 . With the PrNi1-x Fex O3 (x=0.35-1.0) cathodes, the best performance (the interface resistance was 0.15 Wcm 2 ) was obtained when x was 0.4.