A new synthetic procedure to make a condensed phase hydrogen storage material, ammonia borane (AB) is described and compared with previous literature procedures. 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 THF to yield AB in near quantitative yield. AB, NH3BH3, gravimetric density ca. 194 gm H2/kg and volumetric density ca. 146 H2/liter is a promising chemical hydrogen storage material for fuel cell powered applications.
Revised: March 30, 2010 |
Published: July 1, 2008
Citation
Heldebrant D.J., A.J. Karkamkar, J.C. Linehan, and T. Autrey. 2008.Synthesis of Ammonia Borane for Hydrogen Storage Applications.Energy & Environmental Science 1, no. 1:156-160.PNNL-SA-60960.doi:10.1039/b808865a