Tuning the two phases ratio by nonmetal ion doping in dual‐phase mixed‐conductive ceramic membranes
Journal of the American Ceramic Society(2023)
摘要
Abstract The mixed protonic–electronic conductor of BaCe 0.5 Fe 0.5 O 3− δ can be automatically decomposed into a dual‐phase material of the cerium‐rich oxide BaCe 0.85 Fe 0.15 O 3− δ (BCFe8515) and the iron‐rich oxide BaCe 0.15 Fe 0.85 O 3− δ (BCFe1585). The BaCe 0.5 Fe 0.5 O 3− δ membrane possessed an extremely high hydrogen (H 2 ) permeation flux, but poor stability. Therefore, in this work, for the first time, the nonmetal P is doped to increase the proportion of the BaCe 0.85 Fe 0.15 O 3− δ (P‐doped Ce‐rich) phase to improve the stability of the dual‐phase membrane. The developed dual‐phasic ceramic membranes of BaCe 0.5 Fe 0.5− x P x O 3− δ (BCFeP x ) ( x = 0, 0.025, 0.05, 0.1) exhibit enhanced stability compared to their parent oxides. Under the condition of 950°C, feed gas with dry 50% H 2 ‐50% He and sweep gas with wet Ar, the H 2 permeation flux of BCFeP 0.05 membrane stabilized at 1.56 mL min −1 cm −2 after the long‐term stability test for 480 h. The enhanced stability resulted from the increase of the P‐doped Ce‐rich phase content and the inhibition of Fe 2 O 3 phase precipitation from the BaCe 0.15 Fe 0.85 O 3− δ (P‐doped Fe‐rich) phase in the reducing atmosphere by doping non‐metal P element.
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关键词
ceramic membranes,nonmetal ion
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