| Téléchargement | - Voir le manuscrit accepté : Early deuteration steps of Pd- and Ta/Pd- catalyzed Mg70Al30 thin films observed at room temperature (PDF, 983 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1016/j.ijhydene.2010.08.001 |
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| Auteur | Rechercher : Harrower, Christopher1; Rechercher : Poirier, Eric2; Rechercher : Fritzsche, Helmut2; Rechercher : Kalisvaart, Peter1; Rechercher : Satija, Sushil; Rechercher : Akgun, Bulent; Rechercher : Mitlin, David1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut national de nanotechnologie
- Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
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| Format | Texte, Article |
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| Sujet | Hydrogen storage; Metal hydride; Catalyst; Thin film; Neutron reflectometry |
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| Résumé | Deuterium absorption in Mg₇₀Al₃₀ thin films coated with a Pd layer and a Ta/Pd bilayer were investigated using in situ neutron reflectometry at room temperature and deuterium pressures up to 1.3 bar. The approach used provides a detailed profile, at the nanoscale, of the deuterium content inside the specific layers that constitute the films. It is found that Mg₇₀Al₃₀ can store up to 5 wt.% under these mild conditions following a two-step mechanism. The latter involves the deuteration of the top and bottom catalyst layers first, followed by the main Mg₇₀Al₃₀ layer. The presence of deuterium throughout the films in the early absorption stages evidences atomic deuterium spillover from the catalyst layers. The addition of a Ta layer between the Pd and Mg₇₀Al₃₀ was found to allow observable absorption at a pressure 10 times lower than on the Ta-free sample, without affecting the storage capacity. Our measurements imply that this improvement in kinetics is due to a lowering of the nucleation barrier for the formation of the hydride phase in the Mg₇₀Al₃₀ layer. |
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| Date de publication | 2010-10-01 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 16885316 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | aca79052-14af-471f-8e4b-634d287c5449 |
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| Enregistrement créé | 2011-02-16 |
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| Enregistrement modifié | 2020-04-17 |
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