Ca(BH4)(2)-MgF2 Reversible Hydrogen Storage: Reaction Mechanisms and Kinetic Properties

Rapee Gosalawit-Utke, Karina Suarez, Jose M. Bellosta von Colbe, Ulrike Boesenberg, Torben R. Jensen, Yngve Cerenius, Christian Bonatto Minella, Claudio Pistidda, Gagik Barkhordarian, Matthias Schulze, Thomas Klassen, Ruediger Bormann, Martin Dornheim

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19 Citations (SciVal)


A composite of Ca(BH4)(2)-MgF2 is proposed as a reversible hydrogen storage system. The dehydrogenation and rehydrogenation reaction mechanisms are investigated by in situ time-resolved synchrotron radiation powder X-ray diffraction (SR-PXD) and Raman spectroscopy. The formation of an intermediate phase (CaF2-xHx) is observed during rehydrogenation. The hydrogen content of 4.3 wt % is obtained within 4 h during the first dehydrogenation at isothermal and isobaric conditions of 330 degrees C and 0.5 bar H-2, respectively. The cycling efficiency is evaluated by three release and uptake cycles together with absorbed hydrogen content in the range 5.1-5.8 wt % after 2.5 h (T = 330 degrees C and p(H-2) = 130 bar). The kinetic properties on the basis of hydrogen absorption are comparable for all cycles. As compared to pure Ca(BH4)(2) and Ca(BH4)(2)-MgH2 composite, Ca(BH4)(2)-MgF2 composite reveals the kinetic destabilization and the reproducibility of hydrogen storage capacities during cycling, respectively.
Original languageEnglish
Pages (from-to)3762-3768
JournalJournal of Physical Chemistry C
Issue number9
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences


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