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Decomposition Reactions and Reversibility of the LiBH4-Ca(BH4)(2) Composite

Lee, Ji Youn; Ravnsbaek, Dorthe; Lee, Young-Su; Kim, Yoonyoung; Cerenius, Yngve LU ; Shim, Jae-Hyeok; Jensen, Torben R.; Hur, Nam Hwi and Cho, Young Whan (2009) In Journal of Physical Chemistry C 113(33). p.15080-15086
Abstract
LiBH4 is one of the promising candidates for hydrogen storage materials because of its high gravimetric and volumetric hydrogen capacity. However, its high dehydrogenation temperature and limited reversibility has been a hurdle for its use in real applications. In an effort to overcome this barrier and to adjust the thermal stability, we make a composite system LiBH4-Ca(BH4)(2). In order to fully characterize this composite system we study xLiBH(4) + (1 - x)Ca(BH4)(2) for several x values between 0 and 1, using differential scanning calorimetry, in situ synchrotron X-ray diffraction, thermogravimetric analysis, and mass spectrometry. Interestingly, this composite undergoes a eutectic melting at ca. 200 degrees C in a wide composition... (More)
LiBH4 is one of the promising candidates for hydrogen storage materials because of its high gravimetric and volumetric hydrogen capacity. However, its high dehydrogenation temperature and limited reversibility has been a hurdle for its use in real applications. In an effort to overcome this barrier and to adjust the thermal stability, we make a composite system LiBH4-Ca(BH4)(2). In order to fully characterize this composite system we study xLiBH(4) + (1 - x)Ca(BH4)(2) for several x values between 0 and 1, using differential scanning calorimetry, in situ synchrotron X-ray diffraction, thermogravimetric analysis, and mass spectrometry. Interestingly, this composite undergoes a eutectic melting at ca. 200 degrees C in a wide composition range, and the eutectic composition lies between x = 0.6 and 0.8. The decomposition characteristics and the hydrogen capacity of this composite vary with x, and the decomposition temperature is lower than both the pure LiBH4 and Ca(BH4)(2) at intermediate conpositions, for example, for x approximate to 0.4, decomposition is finished below 400 degrees C releasing about 10 wt % of hydrogen. Partial reversibility of this system was also confirmed for the first time for the case of if mixed borohydride composite. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
113
issue
33
pages
15080 - 15086
publisher
The American Chemical Society
external identifiers
  • wos:000268907500077
  • scopus:69049110012
ISSN
1932-7447
DOI
10.1021/jp904400b
language
English
LU publication?
yes
id
51e882b7-038d-4bfc-8fa7-db5374782696 (old id 1477273)
date added to LUP
2009-09-28 14:53:50
date last changed
2017-10-01 03:45:06
@article{51e882b7-038d-4bfc-8fa7-db5374782696,
  abstract     = {LiBH4 is one of the promising candidates for hydrogen storage materials because of its high gravimetric and volumetric hydrogen capacity. However, its high dehydrogenation temperature and limited reversibility has been a hurdle for its use in real applications. In an effort to overcome this barrier and to adjust the thermal stability, we make a composite system LiBH4-Ca(BH4)(2). In order to fully characterize this composite system we study xLiBH(4) + (1 - x)Ca(BH4)(2) for several x values between 0 and 1, using differential scanning calorimetry, in situ synchrotron X-ray diffraction, thermogravimetric analysis, and mass spectrometry. Interestingly, this composite undergoes a eutectic melting at ca. 200 degrees C in a wide composition range, and the eutectic composition lies between x = 0.6 and 0.8. The decomposition characteristics and the hydrogen capacity of this composite vary with x, and the decomposition temperature is lower than both the pure LiBH4 and Ca(BH4)(2) at intermediate conpositions, for example, for x approximate to 0.4, decomposition is finished below 400 degrees C releasing about 10 wt % of hydrogen. Partial reversibility of this system was also confirmed for the first time for the case of if mixed borohydride composite.},
  author       = {Lee, Ji Youn and Ravnsbaek, Dorthe and Lee, Young-Su and Kim, Yoonyoung and Cerenius, Yngve and Shim, Jae-Hyeok and Jensen, Torben R. and Hur, Nam Hwi and Cho, Young Whan},
  issn         = {1932-7447},
  language     = {eng},
  number       = {33},
  pages        = {15080--15086},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Decomposition Reactions and Reversibility of the LiBH4-Ca(BH4)(2) Composite},
  url          = {http://dx.doi.org/10.1021/jp904400b},
  volume       = {113},
  year         = {2009},
}