Fabrication et étude du comportement électrochimique en atmosphère réductrice de couches minces à base de cérine en vue de leur interaction dans des dispositifs électrochimiques à oxyde solide

Abstract : The decrease in the operating temperature of SOFC towards 600-750°C is an inescapable imperative to increase their lifetime and allow the use of less expensive interconnects. Nevertheless, this leads to an increment of the ohmic drop of the electrolyte and overvoltages at the electrodes and, therefore, the decline of the electrochemical performance of the stack. Different solutions can be explored: replacing the usual electrolyte, decreasing its resistance by reducing its thickness (<5 µm) and, in any event, improving reactions at interfaces by adding functional thin films. On the one hand, this study analyzes different approaches for the development of thin layers of pure or doped CeO2, whose role is proven, in particular at the level of the anode oxidation: deposit by atomic layer deposition, ALD, and chemical bath deposition, CBD. On the other hand, the use of a new composite material (ceria-doped gadolinium and Li2CO3-K2CO3 in a molten state) is analyzed as SOFC electrolyte. Finally, the electrochemical properties of these composite electrolytes, combined with thin layers of ceria and doped ceria prepared by ALD, are analyzed mostly in anodic conditions. The overall goal is to explore the role of thin layers and new promising electrolytes, primarily in the SOFC anode conditions.
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Bianca Medina-Lott. Fabrication et étude du comportement électrochimique en atmosphère réductrice de couches minces à base de cérine en vue de leur interaction dans des dispositifs électrochimiques à oxyde solide. Matériaux. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨pastel-00824202⟩

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