Numerical study of hydrogen permeation flux in ytterbium doped strontium cerate and thulium doped strontium cerate (II)

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Title Numerical study of hydrogen permeation flux in ytterbium doped strontium cerate and thulium doped strontium cerate (II)
Author Matsuka, Maki; Braddock, Roger David; Agranovski, Igor E
Journal Name Mathematics and Computers in Simulation
Year Published 2009
Place of publication Netherlands
Publisher Elsevier
Abstract This study analyses the hydrogen permeation flux model with (1) modifications in the defect concentration calculations where the concentration of substitutional cation on cerium site is utilised as the independent variable for the calculation, instead of the previous step-wise calculation with the concentration of oxygen vacancy as the independent variable and (2) the additional terms to include the oxygen partial pressure gradients for calculation of hydrogen permeation flux. The modification in the defect concentration method allows a short model simulation run time, which consequently allows incorporation of the concentration constraints in the parametric sensitivity analysis, but still produces the same set of defect concentrations as calculated in the previous methods. It is also found in this study that the discrepancy between the model and experimental results (in terms of the effect of changes in hydrogen partial pressure gradients on the hydrogen permeation flux) is not due to the influence of oxygen partial pressure gradients. Parametric sensitivity analysis shows that there is no significant difference in the sensitivity of the model by comparing Case A and B. The result of parameter tuning to predict the hydrogen permeation flux for 5% thulium doped strontium cerate in Case B shows a similar trend to the previous study (Case A). These results suggest negligible oxygen ion conductivities in these types of membrane, as reported in the literature.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.matcom.2008.11.012
Volume 79
Issue Number 9
Page from 2713
Page to 2723
ISSN 0378-4754
Date Accessioned 2010-04-24
Date Available 2010-06-24T05:19:50Z
Language en_AU
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Organic Semiconductors
URI http://hdl.handle.net/10072/30318
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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