Preparation, Chemical Compatibility and Particle Size of PrBaCo₂O_5+δ-Ce_0.8Sm_0.2O_1.9 Composite Cathode Powder

The PrBaCo₂O_5+δ cathode powder was prepared by solid-state reaction using Pr₆O₁₁, BaCO₃, Co₂O₃ and Fe₂O₃ as starting materials, and calcined at 1000°C, 1100°C, 1200°C and 1300° for 2h in air, respectively. Their crystal structures were analyzed to obtain the optimal temperature of solid-state reaction for PrBaCo₂O_5+δ The equal amount of PrBaCo₂O_5+δ calcined at optimal temperature and Ce_0.8Sm_0.2O_1.9 electrolyte powder were ball-milled and then calcined to prepare composite cathode powder for intermediate-temperature solid oxide fuel cells. Crystal structure was identified by X-ray diffraction, to investigate the chemical compatibility between them. According to the experimental results, the optimal temperature of solid-state reaction for PrBaCo₂O_5+δ is about 1300°, PrBaCo₂O_5+δ is chemically stable with Ce_0.8Sm_0.2O_1.9, and the medium diameter D₅₀ of PrBaCo₂O_5+δ-Ce_0.8Sm_0.2O_1.9 powder is about 14.41μm. (paper)