Evaluation of GdBaCo2O5 + δ as Cathode Material for Doped Lanthanum Gallate Electrolyte IT-SOFCs



The layered perovskite GdBaCo2O5 + δ (GBCO), recently proposed for intermediate temperature solid oxide fuel cell applications, was investigated and compared with Ba0.5Sr0.5Co0.8Fe0.2O3 – δ (BSCF) cathode material using La0.9A0.1Ga0.8Mg0.2O2.85 (A=Sr,Ba) as electrolytes. Area-specific resistance was measured by impendance spectroscopy in symmetrical cells. The cobaltites were prepared by a modified citrate sol–gel route and tested as cathode materials for doped lanthanum gallate-based cells using dry H2 as fuel and air as oxidant, rendering power density values of 180 and 240 mW cm–2 at 1,073 K (1 mm thick pellets) for GBCO and BSCF fuel cells, respectively.