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Conception, élaboration et caractérisation de matériaux de composition et de microstructure innovants pour les micro-piles à combustible à oxyde solide

Abstract : The micro-solid oxide fuel cells (micro-SOFC) appear as attractive miniature sources of energy and are a technological breaking for an alternative to current Li-ion batteries. This work deals with the synthesis, the structural characterization, microstructural and electrochemical of dense and porous thin film exhibiting various composition and structure: LSCF-CGO, Ni(O)-CGO and CGO. These materials have been incorporated as cathode, anode and electrolyte respectively in a device type micro-SOFC operating at 400-600°C with H2 as fuel. The architecture of the cell and the synthesis approach differ from those proposed in the literature. In fact, porosity and composition gradients have been included to the electrodes to limit activation and concentration polarizations. Moreover, the choice of the method of synthesis, sol-gel method coupled with dip-coating to deposit materials was guided by economic criteria and ease implementation. For the synthesis of dense electrolyte thin films (CGO), another synthesis method (ALD) was also explored. In this work, we studied the relationships between structural, microstructural and electrical properties of porous thin film electrodes under the conditions of synthesis and of testing. Based on this study, the fabrication and evaluation of micro-SOFC cells properties deposited on a porous Pt/Al2O3 support have been performed
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  • HAL Id : tel-00833281, version 1

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Guillaume Müller. Conception, élaboration et caractérisation de matériaux de composition et de microstructure innovants pour les micro-piles à combustible à oxyde solide. Science des matériaux [cond-mat.mtrl-sci]. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨NNT : 2012PAO66530⟩. ⟨tel-00833281⟩

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