Substantial emission of NH3 during thermal decomposition of sodium amidoborane, NaNH2BH3

Karol J. Fijałkowski; Wojciech Grochala

doi:10.1039/B813773K

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Journal of Materials Chemistry

Issue 14, 2009

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Paper

Substantial emission of NH₃ during thermal decomposition of sodium amidoborane, NaNH₂BH₃

Karol J. Fijałkowski^a and Wojciech Grochala*^a^b

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Faculty of Chemistry, The University of Warsaw, Pasteura 1, Warsaw, Poland

ICM, The University of Warsaw, Pawińskiego 5a, Warsaw, Poland
E-mail: wg22@cornell.edu

J. Mater. Chem., 2009,19, 2043-2050

DOI: 10.1039/B813773K
Received 07 Aug 2008, Accepted 19 Dec 2008
First published online 11 Feb 2009

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Sodium amidoborane (SAB, NaNH₂BH₃), an ammonia borane (AB, NH₃BH₃) derivative, was recently reported as a novel solid-state hydrogen storage material. We reinvestigate its thermal decomposition using the best grade commercially available AB (98%) and technical quality (90%) substrates. We characterize evolved gases with mass and FT-IR spectroscopy and observe emission of hydrogen contaminated with significant amounts of ammonia making it undesirable for low-temperature fuel cell applications. We propose a reaction scheme which explains the evolution of NH₃ from SAB.