Abstract
The partially Cr-substituted perovskite-type (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.00, 0.05, 0.10) oxides were synthesized by the solid-state reaction method and characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Oxygen permeability across dense (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.00, 0.05, 0.10) membranes as oxygen separators for the high-temperature air separation were studied at 700–850 °C, and it is increased as x = 0.00 > 0.05 > 0.10 for (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ. The lowered oxygen permeability of the Cr-doped membranes is attributed to the higher oxidation state of the doped Cr cations with respect to Fe/Co ones, leading to the decrease in the oxygen vacancy concentration in the (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.00) oxide. The enhanced oxygen permeation stability for the partially Cr-doped (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.05, 0.10) separation membranes was observed by the long-term permeation tests. The oxygen ionic transporting mechanism for oxygen permeation across the as-prepared dense (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.10) membranes was also studied at 700–850 °C. The results demonstrate that the oxygen diffusive transporting in the sintered ceramics is the rate-limiting step for the dense (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.10) membranes in the temperature range of 700–850 °C investigated.
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H. L. gratefully acknowledges the financial supports from the National Natural Science Funds of China (No. 21676264), the State Key Laboratory of Separation Membranes and Membrane Processes/Tiangong University (No. M202104), and the key scientific research projects of Henan Provincial Colleges (No 22B150020) and Xinyang University (Nos. 2020-XJLZD-001, 2020-DXSLYB-008), P. R. China.
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Lu, H., Zhang, H., Wang, H. et al. Functional (Ba0.5Sr0.5)(Co0.8Fe0.2-xCrx)O3-δ (x = 0.00, 0.05, 0.10) oxides for membrane-based air separation at high temperatures: structural evolution, oxygen permeability, and transporting mechanism. Ionics 28, 823–830 (2022). https://doi.org/10.1007/s11581-021-04382-6
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DOI: https://doi.org/10.1007/s11581-021-04382-6