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Related Experiment Videos

Decomposition kinetics of the AlH3 polymorphs.

Jason Graetz1, James J Reilly

  • 1Department of Energy Sciences and Technology, Brookhaven National Laboratory, Upton, New York 11973, USA. graetz@bnl.gov

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Newly synthesized aluminum hydride polymorphs offer high hydrogen storage capacity. Decomposition kinetics suggest a nucleation and growth mechanism, crucial for developing advanced hydrogen storage materials.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Solid-State Chemistry

Background:

  • Aluminum hydride (AlH3) polymorphs are promising materials for hydrogen storage due to their high gravimetric hydrogen capacity.
  • Understanding the decomposition kinetics and mechanisms of AlH3 is critical for optimizing hydrogen release and developing practical storage systems.

Purpose of the Study:

  • To synthesize and characterize different aluminum hydride polymorphs (alpha-AlH3, beta-AlH3, gamma-AlH3) using organometallic methods.
  • To investigate the hydrogen desorption properties and decomposition kinetics of these AlH3 polymorphs.
  • To elucidate the mechanism governing the hydrogen release process.

Main Methods:

  • Organometallic synthesis was employed to prepare alpha-AlH3, beta-AlH3, and gamma-AlH3.

Related Experiment Videos

  • Isothermal hydrogen evolution measurements were conducted between 60°C and 140°C to determine rate constants.
  • Fractional decomposition curves were analyzed using Avrami-Erofeyev equations to model decomposition kinetics.

    • Main Results:

    • Aluminum hydride polymorphs demonstrated hydrogen capacities approaching 10 wt% at desorption temperatures below 100°C.
    • Temperature-dependent rate constants were successfully determined for the decomposition process.
    • Decomposition kinetics followed second and third-order Avrami-Erofeyev models, indicating nucleation and growth mechanisms.
    • High activation energies suggest an activated complex mechanism involving approximately nine AlH3 molecules.

    Conclusions:

    • Freshly prepared AlH3 polymorphs exhibit significant hydrogen storage potential with low-temperature desorption.
    • The decomposition kinetics are governed by a nucleation and growth process, providing insights into the solid-state reaction pathway.
    • The findings contribute to the fundamental understanding of aluminum hydride decomposition, paving the way for improved hydrogen storage material design.