Performance of Ba0.5Sr0.5Co0.8Fe0.2O3−δ-CGO-Ag cathode for IT-SOFCs

Abstract Single phase Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF) was synthesized successfully at 1000 °C by solid reaction method. The dependence of thermal expansion and electrical conductivity on temperatures were studied. Electrochemical properties of pure BSCF cathode and BSCF + CGO (20 mol% Gd 2 O 3 -doped CeO 2 ) composite cathode on CGO electrolyte at intermediate temperatures were investigated by using AC impedance analyzer. Additionally, a composite cathode of BSCF containing 30 wt.% CGO and a small quantity of Ag was prepared and studied, which shows the lowest area specific resistance ( 2 at temperatures higher than 700 °C), being a high potential candidate of cathode for intermediate temperature SOFCs (IT-SOFCs, working at 800 °C or lower temperatures).