Sorption properties of NaBH<inf>4</inf>/MH<inf>2</inf> (M = Mg, Ti) powder systems

S. Garroni, C. Milanese, A. Girella, A. Marini, G. Mulas, E. Menéndez, C. Pistidda, M. Dornheim, S. Suriñach, M. D. Baró

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51 Citations (Scopus)

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. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)5434-5441
JournalInternational Journal of Hydrogen Energy
Volume35
DOIs
Publication statusPublished - 1 Jun 2010

Keywords

  • Complex hydrides
  • Hydrogen storage
  • Kinetics enhancement
  • Reactive hydride composites

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