SrCo0.9Sb0.1O3-δ cubic perovskite as a novel cathode for intermediate-to-low temperature solid oxide fuel cells

The SrCo0.9Sb0.1O3-delta(SCS) composite oxide with cubic perovskite structure was synthesized by a modified Pechini method and examined as a novel cathode for intermediate-to-low temperature solid oxide fuel cells (ILT-SOFCs). At 700 degrees C and under open-circuit condition, symmetrical SCS cathode on Sm0.2Ce0.8O1.9 (SDC) electrolyte showed low polarization resistances (R-p) of 0.09 Omega cm(2) in air. A porous layer of SCS was deposited on an anode-supported fuel cell consisting of a similar to 30-mu m thick dense electrolyte of SDC prepared by a cost-effective dip coating process and a NiO-SDC cermet as an anode (Ni-SDC/SDC/SCS). The obtained single cells were tested with humidified (similar to 3% H2O) hydrogen as fuel and the static air as oxidant. A high open-circuit potential of 0.86 V, a maximum power density of 354mW cm(-2), and a low polarization resistance of the electrodes of 0.13 Omega cm(2) was achieved at 650 degrees C. (C) 2008 Elsevier B.V. All rights reserved.