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The sol–gel route: A versatile process for up-scaling the fabrication of gas-tight thin electrolyte layers

Viazzi, Céline and Rouessac, Vincent and Lenormand, Pascal and Julbe, Anne and Ansart, Florence and Guizard, Christian The sol–gel route: A versatile process for up-scaling the fabrication of gas-tight thin electrolyte layers. (2011) Journal of Power Sources, vol. 196 (n° 6). pp. 2987-2993. ISSN 0378-7753

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2010.11.087

Abstract

Sol–gel routes are often investigated and adapted to prepare, by suitable chemical modifications, submicronic powders and derived materials with controlled morphology, which cannot be obtained by conventional solid state chemistry paths. Wet chemistry methods provide attractive alternative routes because mixing of species occurs at the atomic scale. In this paper, ultrafine powders were prepared by a novel synthesis method based on the sol–gel process and were dispersed into suspensions before processing. This paper presents new developments for the preparation of functional materials like yttria-stabilized-zirconia (YSZ, 8% Y2O3) used as electrolyte for solid oxide fuel cells. YSZ thick films were coated onto porous Ni-YSZ substrates using a suspension with an optimized formulation deposited by either a dip-coating or a spin-coating process. The suspension composition is based on YSZ particles encapsulated by a zirconium alkoxide which was added with an alkoxide derived colloidal sol. The in situ growth of these colloids increases significantly the layer density after an appropriated heat treatment. The derived films were continuous, homogeneous and around 20 μm thick. The possible up-scaling of this process has been also considered and the suitable processing parameters were defined in order to obtain, at an industrial scale, homogeneous, crack-free, thick and adherent films after heat treatment at 1400 °C.

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 Journal of Power Sources website: http://www.sciencedirect.com/science/article/pii/S0378775310020781
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Saint-Gobain (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Montpellier 2 (FRANCE)
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Deposited By: Denis Faragou

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