La.

We demonstrate the applicability of LAMOX as an electrolyte for solid oxide fuel cells (SOFC) by preparing two anodesupported cells based on La0.9Dy0.1Mo2O9 and La0.9Dy0.1Mo1 W1O9, and operating at 625°-700°C under single chamber conditions. The two cells, supported by a composite of NiO and Gddoped ceria (GDC), are initialized with a porous Ni1GDC disk to catalyze the partial oxidation reaction of methane. The partially oxidized methane reduces NiO to Ni catalyst and activates the cell at 650°C. A typical membrane electrode assembly of the single chamber SOFC cell consists of a 60-lm-thick La0.9Dy0.1Mo2O9 electrolyte, an anode of Ni1GDC, and a cathode of lanthanum strontium cobalt ferrite. Its peak power measures 220 mW/cm² at 700°C in a tubular chamber of 15 mm in diameter, with the total methane/ air flow rate of 350 mL/min and CH4:O252:1. [ABSTRACT FROM AUTHOR]