Oxygen permeation properties of Sm/Sr co-doped ceria decorated Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3-δ hollow fiber membrane

A series of one-side closed Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3-δ (BSCF) hollow fiber membrane decorated with Sm/Sr co-doped ceria (SSDC) with Ce _0.8 (Sm _1-x Sr _x ) _0.2 O _2-δ compositions have been studied as a function of strontium content (x = 0.0, 0.3, 0.5, and 0.7) for high temperature vacuum driven oxygen separation from air. The oxygen permeation flux of all SSDC-decorated BSCF hollow fiber membranes is higher than that decorated with Sm-doped ceria (SDC, x = 0.0). The BSCF hollow fiber membrane decorated with SSDC with Sr content x = 0.5 exhibits the highest among the series (˜8 mL/cm ² min, 950 °C), which can be mainly ascribed to the increase of oxygen vacancies for the surface exchange reaction.