Influence of M cations on structural, thermal and electrical properties of new oxygen selective membranes based on SrCo(0.95)M(0.05)O(3-delta) perovskite

Zeng, Pingying, Shao, Zongping, Liu, Shaomin and Xu, Zhi Ping (2009) Influence of M cations on structural, thermal and electrical properties of new oxygen selective membranes based on SrCo(0.95)M(0.05)O(3-delta) perovskite. Separation and Purification Technology, 67 3: 304-311. doi:10.1016/j.seppur.2009.03.047


Author Zeng, Pingying
Shao, Zongping
Liu, Shaomin
Xu, Zhi Ping
Title Influence of M cations on structural, thermal and electrical properties of new oxygen selective membranes based on SrCo(0.95)M(0.05)O(3-delta) perovskite
Formatted title
Influence of M cations on structural, thermal and electrical properties of new oxygen selective membranes based on SrCo0.95M0.05O3−δ perovskite
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 0950-4214
0956-9618
1383-5866
1873-3794
Publication date 2009-06-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.seppur.2009.03.047
Open Access Status
Volume 67
Issue 3
Start page 304
End page 311
Total pages 8
Place of publication East Park, Kidlington, Oxford, U.K.
Publisher Pergamon
Language eng
Subject C1
970109 Expanding Knowledge in Engineering
090404 Membrane and Separation Technologies
Abstract In this work, various M cations like Bi5+, Zr4+, Ce4+, Sc3+, La3+, Y3+, Al3+ and Zn2+ were incorporated into SrCoO3-delta (SC) lattices one by one via doping strategy to form a series of new SrCo0.95M0.05O3-delta (SCM) mixed oxides for membrane separation. In general, the M cations have significant effects on the crystal structure, electrical conductivity, sintering behavior and the oxygen permeability of the SCM membranes even though only 5% of Co ions are exchanged. The phase structure of SCMs in the air atmosphere is seemingly determined by the electron configuration in the outer orbits of M cation. In the current cases, the doping of M cation with d(10) configuration results in 2H-hexagonal structure while that with p(6) gives rise to a cubic perovskite or brownmillerite. The formation of cubic perovskite induced by M cation increases the electrical conductivity and the oxygen permeability by 1-2 orders of magnitude due to the high density of oxygen vacancy. In particular, disk-shaped perovskite SrCo0.95Sc0.05O3-delta membrane demonstrates the highest oxygen flux and theoretical analysis indicates that the oxygen permeation process is rate-determined by the surface reactions. (C) 2009 Published by Elsevier B.V.
Formatted abstract
In this work, various M cations like Bi5+, Zr4+, Ce4+, Sc3+, La3+, Y3+, Al3+ and Zn2+ were incorporated into SrCoO3−δ (SC) lattices one by one via doping strategy to form a series of new SrCo0.95M0.05O3−δ (SCM) mixed oxides for membrane separation. In general, the M cations have significant effects on the crystal structure, electrical conductivity, sintering behavior and the oxygen permeability of the SCM membranes even though only 5% of Co ions are exchanged. The phase structure of SCMs in the air atmosphere is seemingly determined by the electron configuration in the outer orbits of M cation. In the current cases, the doping of M cation with d10 configuration results in 2H-hexagonal structure while that with p6 gives rise to a cubic perovskite or brownmillerite. The formation of cubic perovskite induced by M cation increases the electrical conductivity and the oxygen permeability by 1–2 orders of magnitude due to the high density of oxygen vacancy. In particular, disk-shaped perovskite SrCo0.95Sc0.05O3−δ membrane demonstrates the highest oxygen flux and theoretical analysis indicates that the oxygen permeation process is rate-determined by the surface reactions.
Keyword Perovskite
Doping
Electron configuration
Oxygen separation membrane
Oxygen permeability
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 20646002
BK2006180
2006001926
Institutional Status UQ

 
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Created: Thu, 03 Sep 2009, 17:56:52 EST by Mr Andrew Martlew on behalf of Functional Nanomaterials