Novel dense mixed-conducting membrane for oxygen permeation

Perovskite type SrCo_0.4Fe_0.6O_3-δ(SCF) membrane and a novel perovskite-related ZrO₂ doped SrCo_0.4Fe_0.6O_3-δ(SCFZ) membrane were successfully prepared by isostatic pressing. The sintered membranes were characterized by high-temperature X-ray diffraction (HTXRD) and energy dispersive spectroscopy (EDS). The oxygen permeabilities of membranes have been measured in the temperature range of 923 K to 1243 K. The oxygen permeation flux at 1123 K and activation energy of SCFZ membrane with the thickness of 2 mm are respectively 2.68×10^-7 mol·cm^-2·min^-1 and 97.76 kJ·mol^-1. The results of HTXRD in argon atmosphere and the oxygen permeation experiment indicate that the SCFZ membrane is stable at elevated temperature and low oxygen partial pressure.