Sorption properties of NaBH4/MH2 (M = Mg,Ti) powder systems |
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| Authors: | S Garroni C Milanese A Girella A Marini G Mulas E Menéndez C Pistidda M Dornheim S Suriñach MD Baró |
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| Affiliation: | 1. Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain;2. C.S.G.I., Dipartimento di Chimica Fisica “M. Rolla”, Università di Pavia, Viale Taramelli 16, I-27100 Pavia, Italy;3. Dipartimento di Chimica, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy;4. Instituut voor Kern- en Stralingsfysica and INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, BE-3001 Leuven, Belgium;5. Institute of Materials Research, GKSS Research Centre Geesthacht GmbH, Max-Planck-Straße 1, D-21502 Geesthacht, Germany |
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| 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 multi-step 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. |
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| Keywords: | Hydrogen storage Complex hydrides Reactive hydride composites Kinetics enhancement |
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