Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2012.11.072
Title: High performance oxygen permeable membranes with Nb-doped BaBi0.05Co0.95O3-δ perovskite oxides
Authors: Wang, Z.
Kathiraser, Y.
Kawi, S. 
Keywords: Activation energy
BaBi0.05Co0.95-xNbxO3-δ
Nb
Oxygen nonstoichiometry
Oxygen permeation disk membrane
Perovskite
Issue Date: 5-Mar-2013
Citation: Wang, Z., Kathiraser, Y., Kawi, S. (2013-03-05). High performance oxygen permeable membranes with Nb-doped BaBi0.05Co0.95O3-δ perovskite oxides. Journal of Membrane Science 431 : 180-186. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2012.11.072
Abstract: BaBi0.05Co0.95-xNbxO3-δ (x=0-0.2) and BaBi0.1Co0.8Nb0.1O3-δ were synthesized via solid state reaction method and fabricated into disk-shaped membranes. The surface morphology, phase structure, oxygen nonstoichiometry and oxygen permeability of the perovskite membranes were investigated by SEM, XRD, TGA techniques and oxygen permeation studies. The experimental result indicates Nb-doping can significantly enhance the oxygen permeability compared to the un-doped disk membrane. Among all compositions, BaBi0.05Co0.8Nb0.15O3-δ showed the highest oxygen flux, reaching 2.92mlcm-2min-1 with 1.3mm thickness membrane at 900°C, coupled with the lowest activation energy, which is 44.17kJmol-1 at 750-900°C and 74.59kJmol-1 at 600-750°C. However, further increasing Nb-doping amount leads to a decrease in the oxygen permeability. Interestingly, the order of tendency towards increasing of oxygen nonstoichiometry with increasing temperature exactly corresponds to the order of oxygen permeation flux of various samples. © 2012 Elsevier B.V.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/89080
ISSN: 03767388
DOI: 10.1016/j.memsci.2012.11.072
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