Study of the hydrogenation mechanism of LaCuMg8 ternary phase : the decomposition induces kinetics improvement
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | COUILLAUD, Samuel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GAUDIN, Etienne | |
| hal.structure.identifier | European Synchrotron Radiation Facility [ESRF] | |
| dc.contributor.author | ANDRIEUX, Jérôme | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GORSSE, Stéphane | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GAYOT, Marion | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | BOBET, Jean-Louis | |
| dc.date.issued | 2012 | |
| dc.identifier.issn | 0360-3199 | |
| dc.description.abstractEn | 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. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Rare-earth intermetallics | |
| dc.subject.en | Hydrogen storage | |
| dc.subject.en | Kinetic and thermodynamic study | |
| dc.subject.en | Morphologic effects | |
| dc.title.en | Study of the hydrogenation mechanism of LaCuMg8 ternary phase : the decomposition induces kinetics improvement | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.ijhydene.2012.05.025 | |
| dc.subject.hal | Chimie/Matériaux | |
| dc.subject.hal | Chimie/Chimie inorganique | |
| bordeaux.journal | International Journal of Hydrogen Energy | |
| bordeaux.page | 11824-11834 | |
| bordeaux.volume | 37 | |
| bordeaux.issue | 16 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00728221 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00728221v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=International%20Journal%20of%20Hydrogen%20Energy&rft.date=2012&rft.volume=37&rft.issue=16&rft.spage=11824-11834&rft.epage=11824-11834&rft.eissn=0360-3199&rft.issn=0360-3199&rft.au=COUILLAUD,%20Samuel&GAUDIN,%20Etienne&ANDRIEUX,%20J%C3%A9r%C3%B4me&GORSSE,%20St%C3%A9phane&GAYOT,%20Marion&rft.genre=article |
Fichier(s) constituant ce document
| Fichiers | Taille | Format | Vue |
|---|---|---|---|
|
Il n'y a pas de fichiers associés à ce document. |
|||