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Nouveaux intermétalliques ternaires à base de magnésium pour le stockage de l'hydrogène

Abstract : The use of fossil fuels (non-renewable energy) is responsible for increasing the concentration of greenhouse gases in the atmosphere. Among the considered alternatives, hydrogen is seen as the most attractive energy vector. The storage in intermetallics makes it possible to obtain mass and volume capacities (e.g. 140 g/L) higher than those obtained by liquid form or under pressure (respectively 71 and 40 g/L). We have synthesised Mg and Rare Earth based compounds (RE = Y, Ce and Gd), derived from the cubic Laves phases AB2. Their physical and chemical properties have been studied (hydrogenation, electrochemistry, magnetism, ...). The conditions of sorption (P and T) are particularly favorable (i.e. absorption at room temperature and atmospheric pressure). Besides, to improve the sorption kinetics of metallic magnesium, the compounds developed previously were used as catalysts. Thus, GdMgNi4 was milled with magnesium and the speeds of absorption and desorption of the mixture are found higher than those obtained for the composites Mg+Ni or Mg+V, which are reference systems. A theoretical approach (DFT) was used to model the electronic structure of the ternary compounds (i.e. REMgNi4) and thus to predict or confirm the experimental results.
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Submitted on : Thursday, July 2, 2009 - 4:19:46 PM
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  • HAL Id : tel-00401213, version 1



Jean-Gabriel Roquefere. Nouveaux intermétalliques ternaires à base de magnésium pour le stockage de l'hydrogène. Matériaux. Université Sciences et Technologies - Bordeaux I, 2009. Français. ⟨tel-00401213⟩



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