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Sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems

Garroni, Sebastiano and Milanese, Chiara and Girella, Alessandro and Marini, Amedeo and Mulas, Gabriele Raimondo Celestino and Menéndez Dalmau, Enric and Pistidda, Claudio and Dornheim, Martin and Suriñach, Santiago and Baró, Maria Dolores (2010) Sorption properties of NaBH4/MH2 (M = Mg, Ti) powder systems. International Journal of Hydrogen Energy, Vol. 35 (11), p. 5434-5441. ISSN 0360-3199. Article.

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DOI: 10.1016/j.ijhydene.2010.03.004

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.

Item Type:Article
ID Code:5622
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hydrogen storage, complex hydrides, reactive hydride composites, kinetics enhancement
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Pergamon / Elsevier
ISSN:0360-3199
Copyright Holders:© 2010 Professor T. Nejat Veziroglu Published by Elsevier
Additional Information:Special issue on 3rd Argentinean and 2nd Latin American Congress inHydrogen and Sustainable Energy Sources, edited by Juana Gervasoni
Deposited On:09 Mar 2011 10:19

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