Effects of B‐site doped elements in the electronic‐conducting perovskite phase on the property of dual‐phase membranes

Abstract A series of dense oxygen permeable dual‐phase membranes with a composition of 60 wt% Ce _0.8 Gd _0.2 O _2−δ ‐40 wt% Ba _0.95 La _0.05 Fe _0.9 M _0.10 O _3−δ ( CGO ‐ BLFM _0.10 , M=Fe, Nb, Zr, Zn, Sc, Y) were successfully synthesized and evaluated as potential ceramic membranes for oxy‐fuel combustion. The effects of B‐site doped elements in electronic‐conducting phase ( BLFM _0.10 ) on the crystal structure, microstructure, chemical compatibility, oxygen permeability, as well as chemical stability of CGO ‐ BLFM _0.10 were systematically investigated. All electronic‐conducting phase BLFM _0.10 oxides exhibited a pure cubic perovskite structure and showed good chemical compatibility with ionic‐conducting phase CGO . CGO ‐ BLFS c _0.10 showed the best oxygen permeation stability under a pure CO ₂ atmosphere. CO ₂ ‐corrosion on the perovskite phase is the main reason for the property deterioration of fluorite‐perovskite‐typed dual‐phase membrane materials. The stability of dual‐phase membrane materials can be effectively enhanced by reducing the basicity of electronic‐conducting phase of perovskite materials.