Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 590, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.05.007
Keywords
Perovskite; Oxygen permeation membrane; CO2 resistance; DFT; Oxygen vacancy migration energy; Oxygen vacancy formation energy
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Funding
- Federal Ministry of Education and Research of Germany [03SFK2S3B]
- Ministry of Science, Research and the Arts Baden-Wurttemberg
- Deutsche Forschungsgemeinschaft
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Most of the currently used perovskite-based oxygen-transporting membranes have insufficient resistance towards CO2 and high material costs that potentially limit their commercial applications. In the present work, a highly CO2-tolerant oxygen permeation membrane based on La0.6Ca0.4Co1-xFexO3-delta (x = 0, 0.3, 0.5, 0.7, 1) was designed and prepared by a scalable reverse co-precipitation method. The oxygen permeation flux through the dense membranes was evaluated and found to be highly dependent on the Co/Fe ratio. La0.6Ca0.4Co0.3Fe0.7O3-delta possessed the highest permeation flux among the investigated samples, achieving 0.76 ml min(-1)cm(-2) under an Air/He gradient and 0.5 ml min(-1)cm(-2) under an Air/CO2 gradient at 1173 K for a 1 mm thick membrane. A combination study of first principles calculations and experimental measurements was conducted to advance the understanding of Co/Fe ratio effects on the oxygen migration behavior in La0.6Ca0.4Co1-xFexO3-delta. The observed oxygen permeability is three times higher than that reported in literature under similar conditions. The presented results demonstrate that this highly CO2-tolerant membrane is a promising candidate for high temperature oxygen separation applications.
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