| Download | - View accepted manuscript: Early deuteration steps of Pd- and Ta/Pd- catalyzed Mg70Al30 thin films observed at room temperature (PDF, 983 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1016/j.ijhydene.2010.08.001 |
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| Author | Search for: Harrower, Christopher1; Search for: Poirier, Eric2; Search for: Fritzsche, Helmut2; Search for: Kalisvaart, Peter1; Search for: Satija, Sushil; Search for: Akgun, Bulent; Search for: Mitlin, David1 |
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| Affiliation | - National Research Council of Canada. National Institute for Nanotechnology
- National Research Council of Canada. NRC Canadian Neutron Beam Centre
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| Format | Text, Article |
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| Subject | Hydrogen storage; Metal hydride; Catalyst; Thin film; Neutron reflectometry |
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| Abstract | 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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| Publication date | 2010-10-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 16885316 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | aca79052-14af-471f-8e4b-634d287c5449 |
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| Record created | 2011-02-16 |
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| Record modified | 2020-04-17 |
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