Ce0.8Sm0.2O2−δ (SDC) and LaBaCo2O5+δ (LBCO) powders with nanograins were prepared by the cationic surfactant CTAB (cetyltrimethylammonium bromide) assisting method from the inorganic precursor. XRD results revealed the good phase compatibility between fluorite (SDC) and double-perovskite (LBCO) even after sintering and operating at high temperature. The electron-conducting phase LBCO could form a percolative network in SDC–LBCO membrane when its content excesses the threshold value of 40 vol.%, as a consequence, a high electrical conductivity could be achieved with further LBCO addition. The oxygen permeation process was mainly limited by the bulk diffusion of oxygen ions in SDC–LBCO membrane when the membrane thickness was higher than 0.8 mm. The oxygen permeation flux increases with increasing temperature and decreasing membrane thickness. The maximum oxygen flux could achieve about 4.59 x 10−7mol/cm2s at 950C for 0.6-mm-thick composite membrane, making them be promising candidates for practical oxygen permeable devices.

Synthesis and Oxygen Permeation Properties of a Ce0.8Sm0.2O2−δ-LaBaCo2O5+δ Dual-Phase Composite Membrane. T.Chen, H.Zhao, N.Xu, Y.Li, X.Lu, W.Ding, F.Li: Journal of Membrane Science, 2011, 370[1-2], 158-65