Electrode Properties and High Temperature Stability of PrNi_(1-x)Fe_xO_3 Cathode

摘要

We investigated the use of PrNi_(1-x)Fe_xO_3 (x=0.35-1.0) as an SOFC cathode material. The crystal structure is similar to that of LaNi_(1-x) Fe_xO_3, which is a candidate material for an SOFC cathode. Single phase (orthorhombic phase) PrNi_(1-x)Fe_xO_3 (x=0.35-1.0) cathodes were successfully synthesized with a two-step solid-state reaction consisting of 1300°C sintering and 800°C annealing processes. We ascertained that these cathodes were also in a single phase after firing at 1100°C on a Ce_(0.9)Gd_(0.1)O_(1.95) (GDC) electrolyte and at an operating temperature of 800°C. The interface resistance of these cathodes was measured with an AC impedance method at 800°C. The cathodes performed better than those made of LaNi_(0.6)Fe_(0.4)O_3. With the PrNi_(1-x)Fe_xO_3 (x=0.35-1.0) cathodes, the best performance (the interface resistance was 0.15 Ωcm~2) was obtained when x was 0.4.