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Article Dans Une Revue International Journal of Hydrogen Energy Année : 2012

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

Résumé

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.
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hal-00728221 , version 1 (03-06-2021)

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Samuel Couillaud, Etienne Gaudin, Jérôme Andrieux, Stéphane Gorsse, Marion Gayot, et al.. Study of the hydrogenation mechanism of LaCuMg8 ternary phase : the decomposition induces kinetics improvement. International Journal of Hydrogen Energy, 2012, 37 (16), pp.11824-11834. ⟨10.1016/j.ijhydene.2012.05.025⟩. ⟨hal-00728221⟩
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