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Elaboration of metallic compacts with high porosity for mechanical supports of SOFC

Panteix, Pierre Jean and Baco-Carles, Valérie and Tailhades, Philippe and Rieu, Mathilde and Lenormand, Pascal and Ansart, Florence and Fontaine, Marie-Laure Elaboration of metallic compacts with high porosity for mechanical supports of SOFC. (2009) Solid State Sciences, vol. 11 (n° 2). pp. 444-450. ISSN 1293-2558

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Official URL: http://dx.doi.org/10.1016/j.solidstatesciences.2008.09.006

Abstract

The development of third generation Solid Oxide Fuel Cells (SOFC) with metallic mechanical supports presents several advantages over that of ceramic stacks by offering a lower cost and longer lifetime of the stacks. As a consequence, it is necessary to prepare metallic porous compacts that remain stable at the operating temperature of the SOFC (700–800 C) under reductive atmosphere. This paper presents an innovative process to elaborate iron, nickel and cobalt porous compacts. The process is based on the thermal decomposition of metal oxalate precursors with controlled morphology into metallic powders with coralline shape. Uniaxial compaction of such powders (without binder addition to the powders) under low uniaxial pressures (rising from 20 to 100 MPa) gave rise to green compacts with high porosity and good mechanical properties. After annealing at 800 C under H2 atmosphere, the compacts still present interconnected porosity high enough to allow sufficient gas flow to feed a SOFC single cell in hydrogen: the porosity rises from 25 to 50% for iron compacts, from 20 to 50% for cobalt compacts, and is higher than 40% for nickel compacts. Results from physicochemical characterization (XRD, SEM, gas permeation, Hg porosimetry) corroborated the process for SOFC application.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Solid State Sciences website : http://www.sciencedirect.com/science/journal/12932558
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Montpellier 2 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By:Nihad Lahdifi

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