Journal
CURRENT APPLIED PHYSICS
Volume 8, Issue 3-4, Pages 498-500Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2007.10.045
Keywords
hydrogen storage; mechanism; kinetics
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One equivalent of hydrogen gas is evolved from ammonia borane (NH3BH3) when it is heated above 70 degrees C. The initial stages of this process have been examined using TG/DSC, optical microscopy, and high temperature X-ray diffraction. Two exothermic events have been observed, the first of which takes place without hydrogen evolution. During this stage, the sample loses its crystallinity and bire-fringence. The products are believed to be a more mobile form of NH3BH3 and the diammoniate of diborane ([NH3BH2NH3](+)[BH4](-)). These products subsequently react in the second exothermic stage to generate hydrogen. (C) 2007 Elsevier B.V. All rights reserved.
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