A comparative structure and performance study of La1-xSrxCoO3-d and La1-xSrxCo0.9Nb0.1O3-d (x=0.5, 0.7, 0.9, and 1.0) oxygen permeable mixed conductors

Zhao, Jing, Sunarso, Jaka, Zhou, Wei, Shao, Zongping, Ran, Ran and Liu, Shaomin (2011) A comparative structure and performance study of La1-xSrxCoO3-d and La1-xSrxCo0.9Nb0.1O3-d (x=0.5, 0.7, 0.9, and 1.0) oxygen permeable mixed conductors. Journal of the Electrochemical Society, 158 3: H299-H304.


Author Zhao, Jing
Sunarso, Jaka
Zhou, Wei
Shao, Zongping
Ran, Ran
Liu, Shaomin
Title A comparative structure and performance study of La1-xSrxCoO3-d and La1-xSrxCo0.9Nb0.1O3-d (x=0.5, 0.7, 0.9, and 1.0) oxygen permeable mixed conductors
Formatted title A comparative structure and performance study of La1-xSrxCoO3-d and La1-xSrxCo0.9Nb0.1O3-d (x=0.5, 0.7, 0.9, and 1.0) oxygen permeable mixed conductors
Journal name Journal of the Electrochemical Society   Check publisher's open access policy
ISSN 1945-7111
0013-4651
Publication date 2011
Year available 2011
Sub-type Article (original research)
DOI 10.1149/1.3533904
Volume 158
Issue 3
Start page H299
End page H304
Total pages 6
Place of publication Dordrecht, The Netherlands
Publisher Springer
Collection year 2012
Language eng
Formatted abstract In this work, we investigate and contrast the perovskite structure of La1−xSrxCoO3−ð and La1−xSrxCo0.9Nb0.1O3−ð (both for x=0.5, 0.7, 0.9, and 1.0) as well as their oxygen nonstoichiometry, oxygen bulk-diffusion, and surface exchange coefficients to describe their distinct performance as ceramic oxygen ionic transport membranes. Le Bail refinements of x-ray diffraction data demonstrate that except for SrCoO3−ð, the structure for all title compounds at room temperature can be fitted adequately using rhombohedrally distorted perovskite structure. The presence of lanthanum is found to reduce the solubility of niobium in perovskite lattice. Aside from SrCo0.9Nb0.1O3−ð, structure deterioration or transformation occurs for all title compounds upon subjected to modest reducing atmosphere of nitrogen. Oxygen permeation testing reveals that Sr0.9Co0.9Nb0.1O3−ð membrane exhibits the largest fluxes among all the title compounds, followed by La0.1Sr0.9Co0.9Nb0.1O3−ðand La0.1Sr0.9Co0.9Nb0.1O3−ð and La0.1Sr0.9CoO3−ð. The oxygen permeation values exhibit exact the same trend as a function of composition with the bulk-diffusion and surface exchange coefficients values indicating both bulk-diffusion and surface exchange limits the oxygen transport through title compounds. In addition, 300-hour permeation testing on the best doped compounds, La0.1Sr0.9Co0.9Nb0.1O3−ð and La0.1Sr0.9CoO3−ð demonstrates that La0.1Sr0.9CoO3−ð has better performance stability, e.g. lower degradation percentage with time relative to its non niobium doped counterpart.
Keyword Oxide fuel-cells
Dense ceramic membranes
Crystal-structure
Perovskite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published 18 January 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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