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

Gosalawit-Utke, Rapee; Suarez, Karina; von Colbe, Jose M. Bellosta; Boesenberg, Ulrike; Jensen, Torben R.; Cerenius, Yngve LU ; Minella, Christian Bonatto; Pistidda, Claudio; Barkhordarian, Gagik and Schulze, Matthias, et al. (2011) In Journal of Physical Chemistry C 115(9). p.3762-3768
Abstract
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... (More)
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. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
115
issue
9
pages
3762 - 3768
publisher
The American Chemical Society
external identifiers
  • wos:000287833200034
  • scopus:79952300155
ISSN
1932-7447
DOI
10.1021/jp108236e
language
English
LU publication?
yes
id
98c2f9bf-a3bb-4538-b55b-29e1c0e9c166 (old id 1869234)
date added to LUP
2011-04-06 12:51:40
date last changed
2017-10-08 03:12:48
@article{98c2f9bf-a3bb-4538-b55b-29e1c0e9c166,
  abstract     = {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.},
  author       = {Gosalawit-Utke, Rapee and Suarez, Karina and von Colbe, Jose M. Bellosta and Boesenberg, Ulrike and Jensen, Torben R. and Cerenius, Yngve and Minella, Christian Bonatto and Pistidda, Claudio and Barkhordarian, Gagik and Schulze, Matthias and Klassen, Thomas and Bormann, Ruediger and Dornheim, Martin},
  issn         = {1932-7447},
  language     = {eng},
  number       = {9},
  pages        = {3762--3768},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Ca(BH4)(2)-MgF2 Reversible Hydrogen Storage: Reaction Mechanisms and Kinetic Properties},
  url          = {http://dx.doi.org/10.1021/jp108236e},
  volume       = {115},
  year         = {2011},
}