Novel cobalt-free tantalum-doped perovskite BaFe1−yTayO3−δ with high oxygen permeation

Cobalt-free perovskite-type oxides BaFe1−yTayO3−δ (0 ≤ y ≤ 0.2) were synthesized via a simple solid state reaction. The cubic perovskite structure can be obtained when y is over 0.1. BaFe0.9Ta0.1O3−δ (BFT0.1) membrane shows the highest oxygen permeation flux, which can reach 1.6 ml·min− 1·cm− 2 at 950 °C under the gradient of air/He. The O2-TPD results reveal that BaFe0.9Ta0.1O3−δ material shows an excellent reversibility and phase structure stability in air. The oxygen permeation flux is limited by the bulk diffusion when the membrane thickness is over 0.8 mm, and it is limited by both the bulk diffusion and the surface exchange when the membrane thickness is below 0.5 mm. Stable oxygen permeation fluxes are obtained during 180 h operation.

Novel cobalt-free perovskite oxide based on BaFe1 − yTayO3 − δ (0 ≤ y ≤ 0.2) were synthesized via a simple solid state reaction. The structure stability, the oxygen permeation, as well as the rate-limiting step for the oxygen permeation were systematically studied. BaFe0.9Ta0.1O3 − δ (BFT0.1) membrane shows the highest oxygen permeation flux, which can reach 1.6 ml · min− 1·cm− 2 at 950 °C under the gradient of air/He. Compared with other perovskite membranes, the BaFe0.9Ta0.1O3 − δ membrane exhibits good reversibility, oxygen permeability and stability, which possibly recommends it to be a promising candidate for practical industrial applications in the future.Figure optionsDownload as PowerPoint slide