Elaboration de borures et phosphures métalliques : synthèse de nanomatériaux en sels fondus et réactivité de surface

Abstract : This PhD work deals with a novel synthesis of metal boride and metal phosphide nanomaterials. Nanostructures of these solids are subject to an increasing interest due to their exciting properties for various applications fields such as superconductivity, high temperature thermoelectricity, energy conversion and storage. In this work, the catalytic and electrocatalytic properties of these nanomaterials are explored. First of all, borides of various transition metals, such as nickel, palladium or a nickel-cobalt composite are studied. To do so, a new liquid-phase synthesis was developed, based on the reactivity of already formed metal nanoparticles with a boron precursor in inorganic molten salts. This new synthesis allowed a precise control over the nanoparticle morphology, size, composition and crystalline structure. By accessing such nanoscale objects, we were able to investigate their properties and performances, especially in the fields of catalysis with the hydrodeoxygenation reaction and electrocatalysis for the hydrogen evolution reaction and oxygen evolution reaction. Finally, the reactivity of red phosphorus in molten salts was addressed, thus paving the way to the extension of this synthetic pathway to metal phosphides.
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Tsou Hsi Camille Chan Chang. Elaboration de borures et phosphures métalliques : synthèse de nanomatériaux en sels fondus et réactivité de surface. Matériaux. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066213⟩. ⟨tel-02320971⟩

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