Abstract
Misfit-type Ca 3− x La x Co 4O 9+ δ ( x=0, 0.3) oxides were synthesised to be evaluated as possible cathode materials for proton conducting fuel cells (PCFCs) based on BaCe 0.9Y 0.1O 3− δ (BCY10) dense ceramic electrolyte. The electrical conductivity value of Ca 2.7La 0.3Co 4O 9+ δ ( σ≈53 S cm –1 at 600 °C) is in the range of usually required value for a cathode application (about 50–100 S cm –1). In order to test the performance of each compound as cathode material, impedance measurements were carried out on Ca 3− x La x Co 4O 9+ δ /BaCe 0.9Y 0.1O 3− δ /Ca 3− x La x Co 4O 9+ δ symmetrical half cells over the temperature range 400–800 °C under wet air. A promising electrocatalytic activity has been observed with both compounds Ca 3Co 4O 9+ δ and Ca 2.7La 0.3Co 4O 9+ δ . Factually, the area specific resistance obtained was about 2.2 Ω cm 2 at 600 °C.
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