Dynamics of ammonia borane using neutron scattering

Craig M. Brown, Teresa L. Jacques, Nancy J. Hess, Luke L. Daemen, Eugene Mamontov, John C. Linehan, Ashley C. Stowe, Tom Autrey

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We have used both the backscattering (HFBS) and time-of-flight (DCS) neutron spectrometers to investigate proton dynamics in ammonia borane, a compound of intense interest as a model for 'chemical hydrogen storage' materials. Results indicate that the deposition of ammonia borane on a mesoporous silicate results in longer proton residence times and lower energy barriers for proton motion compared to bulk ammonia borane. The reduced activation energy for proton motions may partly explain the improved thermolysis and lowering the activation barrier for the loss of the first equivalent of H2. In addition, the phonon density of states for neat ammonia borane compares well with other spectroscopic results, with the intense peak at 22 meV assigned to the librational NH3 and BH3 modes, whereas ammonia borane on MCM-41 displays a broad, featureless spectrum indicating a poorly crystalline material.

Original languageEnglish
Pages (from-to)266-268
Number of pages3
JournalPhysica B: Condensed Matter
Volume385-386 I
DOIs
Publication statusPublished - Nov 27 2006

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Keywords

  • Backscattering
  • Dynamics
  • Hydrogen storage
  • Neutron
  • Quasielastic scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Brown, C. M., Jacques, T. L., Hess, N. J., Daemen, L. L., Mamontov, E., Linehan, J. C., Stowe, A. C., & Autrey, T. (2006). Dynamics of ammonia borane using neutron scattering. Physica B: Condensed Matter, 385-386 I, 266-268. https://doi.org/10.1016/j.physb.2006.05.063