Abstract
Tensile strain in yttria-stabilized zirconia (YSZ) exhibited little impact on oxygen ion conductivity in multilayers composed of YSZ and Ce1−xZrxO2 (CZO).
Highlights
ZrO2-based materials have been widely used as the electrolyte for solid oxide fuel cells (SOFCs) due in part to their very high mechanical and chemical durability.[1,2,3] The most representative and best known example is yttria-stabilized zirconia (YSZ).[4]
Based on the lattice parameters of YSZ (z5.14 A) and CeO2 (z5.41 A), the lattice parameters of CZO30 and CZO45 solid solutions can be estimated as 5.33 Aand 5.29 A, respectively
Li et al reported that the +3% lattice mismatch caused the oxygen ion conductivity to increase by 2 orders of magnitude relative to bulk YSZ when the layer thickness decreased to 5 nm
Summary
ZrO2-based materials have been widely used as the electrolyte for solid oxide fuel cells (SOFCs) due in part to their very high mechanical and chemical durability.[1,2,3] The most representative and best known example is yttria-stabilized zirconia (YSZ).[4] Traditionally processed ceramic YSZ achieves sufficient oxygen ion conductivity (0.01 S cmÀ1) for SOFC operation at temperatures over 800 C.1. This extremely high operating temperature decreases cell durability and increases component cost. We use highly analogous experimentation to examine if CZO can be used to create increased ionic conductivity via biaxial tension in neighboring YSZ layers
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