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

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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.

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Acknowledgements

The authors would like to thank J. M. Fabbri and B. Florin for the efficient management of the SOFC sample preparation, performed on the Nanocharacterization Platform at CEA. Financial support from the Materials World Network program and the French Agence Nationale de la Recherche (ANR 2010 BLAN 0931 01) and the US National Science Foundation (Grant number DMR-1008600) is gratefully acknowledged.

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Correspondence to Julie Villanova.

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Villanova, J., Cloetens, P., Suhonen, H. et al. Multi-scale 3D imaging of absorbing porous materials for solid oxide fuel cells. J Mater Sci 49, 5626–5634 (2014). https://doi.org/10.1007/s10853-014-8275-3

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  • DOI: https://doi.org/10.1007/s10853-014-8275-3

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