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Title: Sorption properties of NaBH(4)/MH(2) (M = Mg, Ti) powder systems
Authors: Garroni, S ×
Milanese, C
Girella, A
Marini, A
Mulas, G
Menéndez Dalmau, Enric
Pistidda, C
Dornheim, M
Suriñach, S
Baró, M D #
Issue Date: 2010
Publisher: Pergamon Press
Series Title: International Journal of Hydrogen Energy vol:35 issue:11 pages:5434-5441
Abstract: The sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems prepared by high-energy ball milling have been thoroughly investigated. Concerning the systems containing MgH2, the 2:1 and 1:2 molar compositions have been studied and both lead to a multistep desorption pathway, where the formation of MgB2 confirms the destabilization of NaBH4 induced by the presence of MgH2. A noticeable kinetic enhancement is achieved for the MgH2-rich system (composition 1:2) if compared with the NaBH4-rich system (composition 2:1). Even though full re-absorption is obtained for neither of the two compositions, fast kinetics is achieved. During absorption, the unsuspected formation of the perovskite-type hydride NaMgH3 is detected and it is showed that this ternary phase contributes to reduce the gravimetric capacity of the systems. Conversely, in the 2NaBH4/ TiH2 system, there is no formation of the intermetallic compound TiB2. Furthermore, a decrease in the sorption kinetics is found in comparison with the systems based on MgH2.
ISSN: 0360-3199
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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