To date, a number of ceramic oxides with the perovskite structure have been proposed as membrane materials for the selective separation of oxygen and the partial oxidation of hydrocarbons due to their high oxygen permeation fluxes. In contrast, their instability under an oxygen pressure gradient and consequent lattice expansion has been shown to be the cause of their decomposition over time, thus generally limiting their use to oxidizing environments. This has led the search for possible materials to be diverted towards alternatives such as composites. In this work, we aim to further our understanding of oxygen transport in composite materials by continuing our studies on a model mixed conducting system of (YSZ) and (LSM) using the isotope exchange depth profiling method in conjunction with secondary ion mass spectrometry (SIMS). The measured effective tracer diffusion coefficients were in the range and the effective surface exchange coefficients in the range . The activation enthalpies for oxygen diffusion and surface exchange processes were calculated to be 113 and , respectively.
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February 2005
This article was originally published in
Journal of Fuel Cell Science and Technology
Article
Oxygen Transport in YSZ∕LSM Composite Materials
M. Dhallu,
M. Dhallu
Department of Materials
, Imperial College, London, SW7 2AZ, UK Tel: +44 207 589 5111 Ext. 56721
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J. A. Kilner
J. A. Kilner
Department of Materials
, Imperial College, London, SW7 2AZ, UK Tel: +44 207 589 5111 Ext. 56721
Search for other works by this author on:
M. Dhallu
Department of Materials
, Imperial College, London, SW7 2AZ, UK Tel: +44 207 589 5111 Ext. 56721
J. A. Kilner
Department of Materials
, Imperial College, London, SW7 2AZ, UK Tel: +44 207 589 5111 Ext. 56721J. Fuel Cell Sci. Technol. Feb 2005, 2(1): 29-33 (5 pages)
Published Online: July 30, 2004
Article history
Received:
March 24, 2004
Revised:
July 30, 2004
Citation
Dhallu, M., and Kilner, J. A. (July 30, 2004). "Oxygen Transport in YSZ∕LSM Composite Materials." ASME. J. Fuel Cell Sci. Technol. February 2005; 2(1): 29–33. https://doi.org/10.1115/1.1840840
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