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

Författare:
  • 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
Publiceringsår: 2011
Språk: Engelska
Sidor: 3762-3768
Publikation/Tidskrift/Serie: Journal of Physical Chemistry C
Volym: 115
Nummer: 9
Dokumenttyp: Artikel
Förlag: Amer Chemical Soc

Sammanfattning

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.

Disputation

Nyckelord

  • Chemistry

Övriga

Published
Yes
  • ISSN: 1932-7447

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