Optimization of BaxSr1-xCo0.9Nb0.1O3-8 perovskite as oxygen semi-permeable membranes by compositional tailoring
MetadataShow full item record
Mixed conducting SrCo0.9Nb0.1O3−δ perovskite is a newly developed promising ceramic membrane material for air separation. In this work, SrCo0.9Nb0.1O3−δ was further optimized by the introduction of Ba to partially replace Sr in the A-site of the perovskite structure. The phase structure, phase stability, carbonate formation rate under carbon dioxide atmosphere, electrical conductivity, oxygen desorption properties, and oxygen permeation properties of BaxSr1−xCo0.9Nb0.1O3−δ (BSCNx) with varying Ba2+ doping level were systematically investigated. Pure phase cubic perovskite was formed at x = 0.0–0.8. BSCNx (x = 0.0–0.8) can be stably operated in atmospheres with oxygen partial pressure varying from at least 1 atm to as low as 10−5 atm (Ar atmosphere). The barium doping concentration had a significant effect on electrical conductivity and oxygen permeability of the membranes. BSCN0.6 had the highest oxygen permeation flux of 2.67 × 10−6 mol cm−2 s−1 for 0.87 mm thickness at 900 °C and the highest oxygen ionic conductivity of 1.38 S cm−1 at 900 °C.
Showing items related by title, author, creator and subject.
Materials design for ceramic oxygen permeation membranes: Single perovskite vs. single/double perovskite composite, a case study of tungsten-doped barium strontium cobalt ferriteZhang, J.; Zhang, Z.; Chen, Y.; Xu, X.; Zhou, C.; Yang, G.; Zhou, W.; Shao, Zongping (2018)© 2018 Elsevier B.V. Pure oxygen is an important raw material with many important applications. The production of oxygen via a conducting ceramic membrane is a new, cost-effective and advanced technology with the advantage ...
Tan, P.; Liu, M.; Shao, Zongping; Ni, M. (2017)Lithium-oxygen batteries are considered the next-generation power sources for many applications. The commercialization of this technology, however, is hindered by a variety of technical hurdles, including low obtainable ...
Leo, A.; Motuzas, J.; Yacou, C.; Liu, Shaomin; Serra, J.; Navarrete, L.; Drennan, J.; Julbe, A.; Diniz da Costa, J. (2017)Here we show that copper substitution in perovskite-type barium strontium cobalt copper oxide (BSCC) membranes confers extremely high oxygen fluxes well beyond the state of art, reaching 27.5 ml cm-2 min-1 at 950 °C. A ...