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Issue 1, 2008
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Synthesis of ammonia borane for hydrogenstorage applications

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A new synthetic procedure to make the condensed phase hydrogen storage material, ammonia borane (NH3BH3, abbreviated as AB), is described and compared with previous literature procedures. Ammonia borane with a gravimetric density ca. 194 gm H2 kg−1 and a volumetric density ca. 146 H2 litre−1, is a promising chemical hydrogen storage material for fuel cell powered applications. The work shows that ammonium borohydride, NH4BH4, formed in situ by the metathesis of NH4X and MBH4 salts (M = Na, Li; X = Cl, F) in liquid NH3, can be induced to decompose in an organic ether to yield AB in near quantitative yield. The purity of the AB prepared by this one-pot synthetic strategy is sufficient to meet the thermal stability requirements for on-board hydrogen storage.

Graphical abstract: Synthesis of ammonia borane for hydrogen storage applications

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Article information

27 May 2008
03 Jun 2008
First published
20 Jun 2008

Energy Environ. Sci., 2008,1, 156-160
Article type

Synthesis of ammonia borane for hydrogen storage applications

D. J. Heldebrant, A. Karkamkar, J. C. Linehan and T. Autrey, Energy Environ. Sci., 2008, 1, 156
DOI: 10.1039/B808865A

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