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Intermediate phases observed during decomposition of LiBH4

Författare:
  • Lene Mosegaard
  • Bitten Møller
  • Jens-Erik Jørgensen
  • Ulrike Bösenberg
  • Martin Dornheim
  • Jonathan C Hanson
  • Yngve Cerenius
  • Gavin Walker
  • Hans Jørgen Jakobsen
  • Flemming Besenbacher
  • Torben R Jensen
Publiceringsår: 2007
Språk: Engelska
Sidor: 301-305
Publikation/Tidskrift/Serie: Journal of Alloys and Compounds
Volym: 446-447
Dokumenttyp: Konferensbidrag
Förlag: Elsevier Science

Sammanfattning

Lithium tetrahydridoboranate is among the materials with the highest hydrogen content and has great potential as a possible H-2-storage material, although, the release and uptake of H-2 is not fully understood. In this work, LiBH4 was studied by in situ synchrotron radiation powder X-ray diffraction (PXD) and solid state CP/MAS NNIR both at variable temperatures. This study revealed two new phases observed during dehydrogenation of LiBH4. Phase I is hexagonal, a = 4.93(2) and c = 13.47(3) angstrom and is observed in the temperature range -200-300 degrees C, and phase II is orthorhombic, a = 8.70(1), b = 5.44(1) and c = 4.44](8) angstrom and is observed in the temperature range similar to 300-400 degrees C applying a constant heating rate of 5 degrees C/min. Apparently, I transforms into II, e.g. at a constant temperature of T= 265 degrees C after 5 h. Furthermore, a third phase, III, is observed in the temperature range RT to 70 degrees C, and is caused by a reaction between LiBH4 and water vapor from the atmosphere. Hydrogen release is associated with the decomposition of III at ca. 65 degrees C. (C) 2007 Elsevier B.V. All rights reserved.

Disputation

Nyckelord

  • Chemistry

Övriga

10th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications
2014-10-02
Lahaina, HI, United States
Published
Yes
  • ISSN: 0925-8388

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