Design of a Reduction-Resistant Ce[sub 0.8]Sm[sub 0.2]O[sub 1.9] Electrolyte Through Growth of a Thin BaCe[sub 1−x]Sm[sub x]O[sub 3−α] Layer over Electrolyte Surface

Abstract

A method that can block off electronic current through a samaria-doped ceria (SDC, electrolyte is proposed. A thin -based layer 12 μm thick was grown by a solid-state reaction of the electrolyte substrate and a BaO film deposited previously over the substrate surface at 1500°C. A homogeneous junction between the layer and the electrolyte was formed, thus allowing no delamination and cracking of the layer. Tolerance of this layer to was high enough to suppress decomposition into and Open-circuit voltages of a hydrogen-air fuel cell with the coated SDC electrolyte were near 1 V or more in the range of 600-950°C. The resulting peak power density was higher than that of a fuel cell with an uncoated SDC electrolyte. © 2004 The Electrochemical Society. All rights reserved.