aCollege of Chemistry and Materials Science, Liaoning University of Petroleum and Chemical Technology, Fushun 113001, PR China
bGreenhouse Gas Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research, Daejeon 305-343, Republic of Korea
cState Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
Corresponding author at: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China. Tel.: +86 411 8437 9180; fax: +86 411 8469 4447.
The novel Fe/Nb co-substituted SrCo1−2x(Fe,Nb)xO3−δ (x = 0.05, 0.10) oxides have been synthesized and characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetry (TG), and scanning electron microscopy (SEM). The XRD and DSC results demonstrate that the structural stability of the Fe/Nb co-substituted samples x = 0.05, 0.10 is improved greatly compared to the sample x = 0.00. The Fe/Nb co-doping in the SrCoO3−δ oxide results in the improved structural stability of the SrCo1−2x(Fe,Nb)xO3−δ (x = 0.05, 0.10) oxides. The nonstoichiometric and sintering properties were investigated by TG and SEM, and the oxygen permeation fluxes were measured at 800–950 °C for the sample x = 0.10. The improved oxygen permeability of the ceramic SrCo1−2x(Fe,Nb)xO3−δ (x = 0.10) membrane compared to the (Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ and SrCo0.8Fe0.2O3–δ membranes, was observed under an air/He oxygen partial pressure gradient at 800–950 °C.
