COUILLAUD, Samuel; GAUDIN, Etienne; ANDRIEUX, Jérôme; GORSSE, Stéphane; GAYOT, Marion; BOBET, Jean-Louis

doi:10.1016/j.ijhydene.2012.05.025

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COUILLAUD, Samuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GAUDIN, Etienne
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ANDRIEUX, Jérôme
European Synchrotron Radiation Facility [ESRF]

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International Journal of Hydrogen Energy. 2012, vol. 37, n° 16, p. 11824-11834

Elsevier

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The hydrogen sorption properties of LaCuMg8 are investigated. LaCuMg8 crystallizes in the La2Mg17 structure type with the lattice parameters a = 10.1254(2) Å and c = 10.0751(2) Å. An absorption mechanism in 2 steps was reported earlier: (i) the first step, which is irreversible, induces the decomposition of LaCuMg8 into an intimate mixture of 3 phases of sub-micronic size (i.e. LaH3, MgCu2 and MgH2); (ii) the second step consists in the reversible absorption of the "LaCuMg8 activated powder" with kinetics better than for pure magnesium. In order to get a better understanding of the absorption process, it was investigated from thermodynamic, kinetic and morphology points of view. From thermodynamic point of view, the "LaCuMg8 activated powder" behaves like a mixture. Concerning the kinetics, the activation energy was evaluated at about 65 kJ/mol H2, using Avrami-Erofeev model and Arrhenius law. To explain the enhancement of the kinetics, both effects of (i) Mg2Cu/MgCu2 transformation and (ii) morphology induced by the decomposition have been considered.< Leer menos

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Rare-earth intermetallics

Hydrogen storage

Kinetic and thermodynamic study

Morphologic effects

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Study of the hydrogenation mechanism of LaCuMg8 ternary phase : the decomposition induces kinetics improvement

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