Abstract
Abstract A series of novel cobalt-free dense oxygen-permeable membranes of the type with Pr 0.6 Sr 0.4 Fe 1- x Nb x O 3- δ (PSFN x , x = 0–0.1) were synthesized. Subsequently, the effects of Nb-doping on the microstructure, oxygen permeability, and stability of PSFN x were studied under a pure He or CO 2 atmosphere. The structure of the material did not change in either atmospheres and its stability of the material was enhanced as the level of Nb-doping increased. For the sample with x = 0 and 0.075, carbonates and sulfates were present on the sweep side of the PSF membrane, but no impurities were detected on the sweep side of the PSFN 0.075 . In addition, the oxygen-permeation performance exhibited almost no attenuation when the Nb-doping content were 0.075. As revealed by X-ray photoelectron spectroscopy, the CO 2 resistance of the material was enhanced by reducing the basicity of PSFN x , which was induced by the substitution of Fe with Nb.
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