Cobalt-free gadolinium-doped perovskite GdxBa1−xFeO3−δ as high-performance materials for oxygen separation

Cobalt-free oxides GdxBa1−xFeO3−δ (0.01 ≤ x ≤ 0.1) were achieved by a solid state reaction method. It is found that GdxBa1−xFeO3−δ (0.025 ≤ x ≤ 0.1) exhibits the cubic perovskite structure. Among GdxBa1−xFeO3−δ (0.025 ≤ x ≤ 0.1), the Gd0.025Ba0.975FeO3−δ (GBF2.5) membrane shows the outstanding phase structure stability and the highest oxygen permeation, which can reach 1.44 ml·cm− 2·min− 1 at 950 °C under air/He oxygen partial pressure gradient. The GBF2.5 membrane was successfully operated for more than 100 h at 800 °C and the oxygen permeation flux through the membrane is 0.62 ml·cm− 2·min− 1. After 100 h oxygen permeation experiment at 800 °C, X-ray diffraction (XRD) and energy dispersive X-ray spectrometer (EDXS) demonstrate that the GBF2.5 exhibits phase structure stability even at intermediate temperature.

Graphical abstractCobalt-free oxides GdxBa1 − xFeO3 − δ (0.01 ≤ x ≤ 0.1) were achieved by a solid state reaction method. It is found that GdxBa1 − xFeO3 − δ (0.025 ≤ x ≤ 0.1) exhibits the cubic perovskite structure. Among them, the Gd0.025Ba0.975FeO3 − δ membrane shows the outstanding phase structure stability and the highest oxygen permeation, which can reach 1.44 ml·cm− 2·min− 1 at 950 °C under air/He oxygen partial pressure gradient. Membranes with high oxygen permeability and excellent stability have potential industrial application in oxygen enrichment air production.Figure optionsDownload full-size imageDownload as PowerPoint slide