Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-12-01T00:13:41.805Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanistic Studies of Hydrogen Release from Solid Amine Borane Materials

Published online by Cambridge University Press:  01 February 2011

Mark Bowden ,
Tim Kemmitt ,
Wendy Shaw ,
Nancy Hess ,
John Linehan ,
Maciej Gutowski ,
Benjamin Schmid  and
Tom Autrey
Mark Bowden
Affiliation:
[email protected], Industrial Research Ltd, Materials, 69 Gracefield Rd, Lower Hutt, N/A, 6009, New Zealand, +64 4 9313 178, +64 4 9313 142
Tim Kemmitt
Affiliation:
[email protected], Industrial Research Ltd, Lower Hutt, N/A, 6009, New Zealand
Wendy Shaw
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Nancy Hess
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
John Linehan
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Maciej Gutowski
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Benjamin Schmid
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Tom Autrey
Affiliation:
[email protected], Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Get access

Abstract

Ammonia borane (NH3BH3) is a molecular solid with a high volumetric and gravimetric density of hydrogen. We report room temperature structural data which shows how the freely rotating NH3 and BH3 groups allow a N-H…H-B dihydrogen bond in which hydrogen atoms on adjacent molecules are separated by only 1.90Å. The initial decomposition of ammonia borane at 80-100°C into (NH2BH2)n and H2 has been studied by in-situ nmr spectroscopy and kinetic studies using isotopic substitution. The reaction proceeds by a bimolecular pathway involving a [NH3BH2NH3]+BH4− intermediate with an activation energy of 136kJmol−1.

Keywords

energy-storagecrystallographic structurekinetics
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 927: Symposium EE – Hydrogen Storage Materials , 2006 , 0927-EE02-04
Copyright
Copyright © Materials Research Society 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Klooster, W.T., Koetzle, T. F., Siegbahn, P.E.M., Richardson, T.B. and Crabtree, R.H., J. Am. Chem. Soc. 121 6337–6343 (1999).Google Scholar
2. Custalcean, R. and Jackson, J.E., Chem. Rev. 101 1963–1980 (2001).Google Scholar
3. Penner, G.H., Chang, Y.C.P. and Hutzal, J., Inorg. Chem. 38 2868–2873 (1999).Google Scholar
4. Lippert, E.L. and Lipscomb, W.N., J. Am. Chem. Soc. 78 503–504 (1956).Google Scholar
5. Kelly, H.C and Kelly, V.B., Inorg. Chem. 18, 2875–2878 (1979).Google Scholar
6. Chandra, M. and Xu, Q., J. Power Sources (In press, 2005).Google Scholar
7. Hu, M.G., Geanangel, R.A. and Wendlandt, W.W., Thermochimica Acta 23 249–255 (1978).Google Scholar
8. Baitalow, F., Baumann, J., Wolf, G., Jaenicke-Rößler, K. and Leitner, G., Thermochimica Acta 391 159–168 (2002).Google Scholar
9. Smith, R. S., Kaym, B.D. Schmid, B., Li, L., Hess, N., Gutowski, M. and Autrey, T., Prepr. Pap.-Am. Chem. Soc., Div. Fuel Chem. 50 (In press, 2005).Google Scholar
10. Hu, M.G., Paasschen, J.M. Van and Geanangel, R.A., J. Inorg. Nucl. Chem. 39 2147–2150 (1977).Google Scholar
11. Sheldrick, G.M., SHELX97. Programs for Crystal Structure Analysis (Release 97-2). University of Göttingen, Germany (1997).Google Scholar