Abstract
Cone-shaped Sm0.5Sr0.5CoO3−δ (SSC) layer was fabricated by a pulsed laser deposition (PLD) method on the Sm0.2Ce0.8O2−δ (SDC)/La0.9Sr0.1Ga0.8Mg0.2O3−δ (LSGM) bi-layer electrolyte film for metallic anode supported intermediate temperature solid oxide fuel cells. Effect of SSC layer on the power generation property and optimum fabrication condition of SSC layer has been investigated. By inserting SSC layer, power generation property and thermal cycling durability was improved due to increased contact strength and expanded oxygen ion conduction pathway. Especially, the cell having 500 nm thickness SSC layer showed higher power density than that of the cell without SSC layer. The maximum power density (MPD) of the cell was 1.99, 1.10 and 0.53 W/cm2 at 973, 873 and 773 K, respectively. In addition, after third thermal cycling from 973 to 298 K (decreasing and increasing rate; 200 K/h), the decrease in MPD was only 6%. The cell also showed a stable power generating performance under a constant current condition.
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