Perovskite-type Ba0.5Sr0.5Al0.1Fe0.9O3-δ as Intermediate-Temperature Solid Oxide Fuel Cell Cathode
- Received Date: 2012-04-04
Abstract: A cobalt-free perovskite-type Ba0.5Sr0.5Al0.1Fe0.9O3-δ (BSAF) is developed and electro-chemically studied as solid oxide fuel cell (SOFC) cathode. The structures, electrical con-ductivity, and electrode polarizations in symmetrical cell based on mixed ion conducting electrolyte were investigated, respectively. The temperature dependence of conductivity of BSAF in air shows a typical semiconductor behavior with positive temperature coefficient up to 450 oC where the conductivity reaches 14.0 S/cm while above this temperature the negative temperature coefficient dominates the total conductivity. Electrochemical charac-terizations show desirable polarization resistance of BSAF cathode in a symmetric cell based on mixed ion conducting electrolyte at 650-700 oC. A single SOFC with BSAF cathode shows OCV of 1.0 V and maximum output of 420 mW/cm2 at 700 oC with humidified hydrogen fuel and static air oxidant.
|Citation:||Yun Gan, Kui Xie. Perovskite-type Ba0.5Sr0.5Al0.1Fe0.9O3-δ as Intermediate-Temperature Solid Oxide Fuel Cell Cathode[J]. Chinese Journal of Chemical Physics , 2012, 25(5): 605-608. doi: 10.1088/1674-0068/25/05/605-608|