Thermochemical and mechanical properties of Ce0.9Pr0.1O2-δ-Pr0.6Sr0.4Fe0.9Al0.1O3-δ dual-phase membrane

The fluorite-perovskite dual-phase Ce0.9Pr0.1O2-δ-Pr0.6Sr0.4Fe0.9Al0.1O3-δ (CP-PSFA) oxygen transport membrane (OTM) was developed to explore the properties and interaction of the two phases on the crystal structure, sintering behavior, thermochemical expansion, and oxygen release property, mechanical strength, and stability of the dual-phase membrane. The migration of oxygen vacancies between two phases causes the shrinking and expansion of the lattice of CP and PSFA phases, and the lattice of PSFA with higher TEC is compressed while the CP is stretched in the dual-phase membrane at the high-temperature range. The CP phase can significantly improve the mechanical properties of the dual-phase membrane, among which the flexural strength of the CP-PSFA reaches 303±42MPa, almost twice that of PSFA membrane. Moreover, the high reducing gas resistance of the CP phase gives the CP-PSFA membrane more excellent high-temperature chemical stability. These results offer new insights into developing mixed ionic-electronic conducting dual-phase OTMs.