Early deuteration steps of Pd- and Ta/Pd- catalyzed Mg70Al30 thin films observed at room temperature |
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Authors: | Christopher Harrower Eric Poirier Helmut Fritzsche Peter Kalisvaart Sushil Satija Bulent Akgun David Mitlin |
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Affiliation: | 1. Chemical and Materials Engineering, University of Alberta, Alberta T6G 2V4, Canada;2. National Research Council Canada, National Institute for Nanotechnology, Edmonton, Alberta T6G 2M9, Canada;3. National Research Council Canada, SIMS, Canadian Neutron Beam Centre, Chalk River, Ontario K0J 1J0, Canada;4. National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, MD 20899, USA;5. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA |
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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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Keywords: | Hydrogen storage Metal hydride Catalyst Thin film Neutron reflectometry |
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