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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:
m.bowden@irl.cri.nz, 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:
t.kemmitt@irl.cri.nz, Industrial Research Ltd, Lower Hutt, N/A, 6009, New Zealand
Wendy Shaw
Affiliation:
wendy.shaw@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Nancy Hess
Affiliation:
nancy.hess@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
John Linehan
Affiliation:
john.linehan@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Maciej Gutowski
Affiliation:
maciej.gutowski@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Benjamin Schmid
Affiliation:
benjamin.schmid@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
Tom Autrey
Affiliation:
tom.autrey@pnl.gov, Pacific Northwest National Laboratory, Richland, Washington, WA 99252, United States
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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

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