Oxygen permeability and surface kinetics of composite oxygen transport membranes based on stabilized δ-Bi2O3
نویسندگان
چکیده
Composite ceramic membranes based on the ionic conducting Tm-stabilized δ-Bi 2 O 3 (BTM) and electronic (La 0.8 Sr 0.2 ) 0.99 MnO 3-δ (LSM) exhibit among highest oxygen flux values reported for Bi -based membranes. Here, we use pulse-response isotope exchange (PIE) measurements to elaborate limiting factors permeation in BTM - 40-70 vol% LSM composites. Once both phases percolate, between 30 50 BTM, is essentially independent of BTM/LSM volume ratio. The permeability under mixed diffusion- surface control, gradually becoming more bulk-limited with increasing temperature. coefficients BTM-LSM are significantly higher than its constituent phases, revealing that a cooperative mechanism enhances kinetics. Some Tm was substituted Pr introduce conductivity BTM. (Bi 0.15 0.05 (BTP) exhibits compared but remains one order magnitude lower percolating • Composites all control. phases.
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ژورنال
عنوان ژورنال: Journal of Membrane Science
سال: 2022
ISSN: ['1873-3123', '0376-7388']
DOI: https://doi.org/10.1016/j.memsci.2022.120875