Meny

Javascript verkar inte påslaget? - Vissa delar av Lunds universitets webbplats fungerar inte optimalt utan javascript, kontrollera din webbläsares inställningar.
Du är här

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

Författare:
  • Ji Youn Lee
  • Dorthe Ravnsbaek
  • Young-Su Lee
  • Yoonyoung Kim
  • Yngve Cerenius
  • Jae-Hyeok Shim
  • Torben R. Jensen
  • Nam Hwi Hur
  • Young Whan Cho
Publiceringsår: 2009
Språk: Engelska
Sidor: 15080-15086
Publikation/Tidskrift/Serie: Journal of Physical Chemistry C
Volym: 113
Nummer: 33
Dokumenttyp: Artikel
Förlag: American Chemical Society

Sammanfattning

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.

Disputation

Nyckelord

  • Chemistry

Övriga

Published
Yes
  • ISSN: 1932-7447

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen