Cation Diffusion at Interface between Y₂O₃ Stabilized ZrO₂ and CeO₂

Abstract

The solid state reaction at the interface between ZrO₂ electrolyte and CeO₂ interlayer in a model solid oxide fuel cell (SOFC) was examined. At the interface, both Y₂O₃-stabilized ZrO₂ electrolyte and CeO₂ diffuse each other and form the ZrO₂-CeO₂ solid solution. Cation diffusion coefficient and enthalpy were derived by using the Y₂O₃-doped ZrO₂/CeO₂ diffusion couples at 1400-1600°C. The data of inter-diffusion enthalpy of Zr and Ce was 510 kJ mol⁻¹ which should enable to predict how much the interface solid state reaction occurs for simulating the long time cell operation.