Significant effects of sintering temperature on the performance of La0.6Sr0.4Co0.2Fe0.8O3-delta oxygen selective membranes

Zeng, P., Ran, R., Chen, Z., Gu, H., Shao, Z., Diniz Da Costa, J.C. and Liu, S. (2007) Significant effects of sintering temperature on the performance of La0.6Sr0.4Co0.2Fe0.8O3-delta oxygen selective membranes. Journal of Membrane Science, 302 1-2: 171-179. doi:10.1016/j.memsci.2007.06.047


Author Zeng, P.
Ran, R.
Chen, Z.
Gu, H.
Shao, Z.
Diniz Da Costa, J.C.
Liu, S.
Title Significant effects of sintering temperature on the performance of La0.6Sr0.4Co0.2Fe0.8O3-delta oxygen selective membranes
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2007-09
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.memsci.2007.06.047
Volume 302
Issue 1-2
Start page 171
End page 179
Total pages 9
Editor Koros, K.J.
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2008
Language eng
Subject 290603 Membrane and Separation Technologies
660199 Energy transformation not elsewhere classified
C1
Abstract In this work, the effects of sintering temperature on the phase structure, oxygen nonstoichiometry, microstructure, electrical conductivity, and oxygen permeation behavior of perovskite La0.6Sr0.4Co0.2Fe0.8O3-delta membranes were systematically studied. The sintering temperature has negligible effect on the bulk properties of the phase structure and the oxygen nonstoichiometry, but has significant influence on the microstructure and electrical conductivity of the membranes, and therefore imposes large impact on its oxygen permeability. With an increase in the sintering temperature, the grain size increased steadily from 0.3 mu m at 1000 degrees C to 3.5 mu m at 1300 degrees C, accompanied with the substantial enhancement of electrical conductivity but the decrease of activation energy for the electrical conduction. Results indicate that the grain boundary had a much lower electrical conductivity than that of the bulk. The oxygen permeation process was mainly rate-determined by the slow oxygen diffusion over the grain boundary. Higher sintering temperature lowers the activation energy for oxygen permeation and accordingly gives rise to higher oxygen permeation flux. The oxygen permeation flux could be improved more than 10 times if the sintering temperature increased from 1000 to 1300 degrees C. (c) 2007 Elsevier B.V. All rights reserved.
Keyword Engineering, Chemical
Polymer Science
LSCF
perovskite
oxygen separation membrane
sintering
Perovskite-type Oxides
Hollow-fiber Membranes
Partial Oxidation
Permeable Membrane
Ionic-conductivity
Ceramic Membrane
Ba0.5sr0.5co0.8fe0.2o3-delta Perovskite
Electrical-conductivity
Permeating Property
Phase-structure
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Fri, 11 Apr 2008, 10:59:12 EST by Gail Smith on behalf of School of Chemical Engineering