High performance cathodes for solid oxide fuel cells prepared by infiltration of La0.6Sr0.4CoO3-δ into Gd-doped ceria

Samson, A., Sogaard, M., Knibbe, R. and Bonanos, N. (2011) High performance cathodes for solid oxide fuel cells prepared by infiltration of La0.6Sr0.4CoO3-δ into Gd-doped ceria. Journal of the Electrochemical Society, 158 6: B650-B659. doi:10.1149/1.3571249


Author Samson, A.
Sogaard, M.
Knibbe, R.
Bonanos, N.
Title High performance cathodes for solid oxide fuel cells prepared by infiltration of La0.6Sr0.4CoO3-δ into Gd-doped ceria
Formatted title
High performance cathodes for solid oxide fuel cells prepared by infiltration of La0.6Sr0.4CoO3-δ into Gd-doped ceria
Journal name Journal of the Electrochemical Society   Check publisher's open access policy
ISSN 0013-4651
1945-7111
Publication date 2011
Sub-type Article (original research)
DOI 10.1149/1.3571249
Open Access Status Not yet assessed
Volume 158
Issue 6
Start page B650
End page B659
Total pages 10
Place of publication Pennington, NJ United States
Publisher Electrochemical Society
Language eng
Formatted abstract
Cathodes prepared by infiltration of La0.6Sr 0.4CoO3-δ (LSC40) into a porous Ce 0.9Gd0.1O1.95 (CGO10) backbone have been developed for low temperature solid oxide fuel cells. The CGO10 backbone has been prepared by screen printing a CGO10 ink on both sides of a 180 μm dense CGO10 electrolyte-tape followed by firing. LSC40 was introduced into the CGO10 porous backbone by multiple infiltrations of aqueous nitrate solutions followed by firing at 350°. A systematic study of the performance of the cathodes was performed by varying the CGO10 backbone firing temperature, the LSC40 firing temperature and the number of infiltrations. The cathode polarization resistance was measured using electrochemical impedance spectroscopy on symmetrical cells in ambient air, while the resulting structures were characterized by scanning electron microscopy (SEM) and high temperature X-ray diffraction (HT-XRD). The firing temperature of 600° for the LSC40 infiltrate was found to provide a balance between LSC40 material formation and high surface area micronanostructure. The lowest polarization resistances measured at 600 and 400° were 0.044 and 2.3ω cm2 in air, respectively. During degradation tests at 600°, the cathode polarization resistance levels out after about 450 h of testing, giving a final polarization resistance of 0.07ω cm2.
Keyword Cathodes
Dielectric polarisation
Electrochemical electrodes
Electrochemical impedance spectroscopy
Firing (materials)
Lanthanum compounds
Porous materials
Scanning electron microscopy
Soild oxide fuel cells
Strontium compounds
X-ray diffraction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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