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Multi-scale 3D imaging of absorbing porous materials for solid oxide fuel cells.

Authors :
Villanova, Julie
Cloetens, Peter
Suhonen, Heikki
Laurencin, Jérôme
Usseglio-Viretta, François
Lay, Elisa
Delette, Gérard
Bleuet, Pierre
Jauffrès, David
Roussel, Denis
Lichtner, Aaron
Martin, Christophe
Source :
Journal of Materials Science; Aug2014, Vol. 49 Issue 16, p5626-5634, 9p, 4 Black and White Photographs, 1 Diagram, 1 Chart
Publication Year :
2014

Abstract

The performance of advanced functional materials for fuel cell applications are closely linked to the material composition and morphology at the micro and nano-scales. 3D characterization techniques that can provide bulk information at these fine scales are therefore essential for microstructure optimization of these materials. Here, the X-ray nano-holotomography technique is used to image various multi-phase and absorbing solid oxide fuel cell electrodes. Different porous structures for typical commercial cells and innovative electrode designs obtained using a freeze-casting process are studied. Taking advantage of the geometrical setup and the use of high energy X-rays, both large reconstructions (field of view: 150 µm) and local tomography at higher resolution (field of view: 50 µm) can be performed on the same sample to have a multi-scale approach. This produces highly representative sample volumes with a size/resolution ratio that allows the geometric and physical properties of the materials to be calculated, e.g., connectivity of each phase, mean particles diameters, specific surface area, particle size distributions, tortuosity factors, and densities of triple boundary lengths. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00222461
Volume :
49
Issue :
16
Database :
Complementary Index
Journal :
Journal of Materials Science
Publication Type :
Academic Journal
Accession number :
96152257
Full Text :
https://doi.org/10.1007/s10853-014-8275-3