Plasma-Sprayed High-Performance (Bi2O3)0.75(Y2O3)0.25 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs)

Rare earth element-doped bismuth oxides with the fluorite structure (δ-Bi2O3) exhibit high oxygen ion conductivity at low temperature, which is promising electrolyte materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). However, traditional co-sintering process not applicable to manufacturing of IT-SOFCs using melting point Bi2O3-based electrolyte, while further high-temperature processing required deposition electrolytes. In this study, plasma spraying was used examine possibility deposit high-performance electrolytes without following process. (Bi2O3)0.75 (Y2O3)0.25 (YSB) spray powders were prepared by sinter-crushing method. The YSB fabricated different temperatures. effects temperature on coating microstructure, crystalline stability, and investigated. Results showed that as-sprayed present a dense microstructure well-bonded lamellar interfaces. pure δ-phase deposited 37.5-75 μm 350 °C. presented excellent ionic 0.19 S cm−1 700 °C in comparison 0.21 sintered bulk.