Publication Date:
2010
Short description:
Sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems / Garroni, S., Milanese, C., Girella, A., Marini, A., Mulas, G.R.C.E., Menendez, E., Pistidda, C., Dornheim, M., Surinach, S., Baro, M.d.. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - 35:11(2010), pp. 5434-5441. [10.1016/j.ijhydene.2010.03.004]
abstract:
The sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems prepared by highenergy
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.
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.
Iris type:
1.1 Articolo in rivista
Keywords:
Hydrogen storage; Complex hydrides; Reactive hydride composites; Kinetics enhancement
List of contributors:
Garroni, Sebastiano; Milanese, C; Girella, A; Marini, A; Mulas, Gabriele Raimondo Celestino Ettore; Menendez, E; Pistidda, C; Dornheim, M; Surinach, S; Baro, Md
Published in: