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Activated Aluminum Hydride Hydrogen Storage Compositions

Brookhaven National Laboratory

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<p>
	Schematic representation of &nbsp;mechanical alloying reaction during ball milling to produce H<sub>2</sub>-transparent LiAlH<sub>4</sub> windows.</p>

Schematic representation of  mechanical alloying reaction during ball milling to produce H2-transparent LiAlH4 windows.

Technology Marketing Summary

Aluminum hydride is the best known alane and has been known for over 60 years. It is potentially a very attractive medium for onboard automotive hydrogen storage, since it contains 10 wt.% hydrogen with a high volumetric density of hydrogen. Pure aluminum hydride requires heating to about 150°C before it desorbs significant hydrogen. Doping it with alkali metal hydrides reduces the desorption temperature, but the dopants limit the hydrogen storage capacity in proportion to the amount incorporated. By activating the aluminum hydride as in the invention, the rate of hydrogen production is increased, making it suitable for use in fuel cells or internal combustion engines, while its hydrogen capacity is maintained by limiting the amount of stimulant required.

Description

An activated aluminum hydride hydrogen storage composition comprises aluminum hydride in combination with a hydrogen-desorption stimulant comprising metal hydride compound(s), metal aluminum hydride compound(s), or a combination of the compounds. The stimulant is present in a molar amount of less than 50% of the combined molar amounts of aluminum hydride plus stimulant.

Benefits

Including a hydrogen desorption stimulant in the storage composition allows more hydrogen to be desorbed at a lower temperature with less additive.

Applications and Industries

Onboard vehicular hydrogen storage; fuel cells; internal combustion engines

More Information
  • Sandrock, et al., “Accelerated thermal decomposition of AlH3 for hydrogen-fueled vehicles,” Appl. Phys. A, 80, 687-690 (2005). DOI: 10.1007/s00339-004-3105-0
  • Sandrock, et al., “Alkali metal hydride doping of α-AlH3 for enhanced H2 desorption kinetics,” J. All. Com., 421, 185-189 (2006). DOI: 10.1016/j.jallcom.2005.09.081
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 7,837,976
Patent
7,837,976
Activated aluminum hydride hydrogen storage compositions and uses thereof
In one aspect, the invention relates to activated aluminum hydride hydrogen storage compositions containing aluminum hydride in the presence of, or absence of, hydrogen desorption stimulants. The invention particularly relates to such compositions having one or more hydrogen desorption stimulants selected from metal hydrides and metal aluminum hydrides. In another aspect, the invention relates to methods for generating hydrogen from such hydrogen storage compositions.
Brookhaven National Laboratory 11/23/2010
Issued
Patent 8,268,288
Patent
8,268,288
Regeneration of aluminum hydride
The present invention provides methods and materials for the formation of hydrogen storage alanes, AlH.sub.x, where x is greater than 0 and less than or equal to 6 at reduced H.sub.2 pressures and temperatures. The methods rely upon reduction of the change in free energy of the reaction between aluminum and molecular H.sub.2. The change in free energy is reduced by lowering the entropy change during the reaction by providing aluminum in a state of high entropy, and by increasing the magnitude of the change in enthalpy of the reaction or combinations thereof.
Brookhaven National Laboratory 09/18/2012
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 05-15PrototypeAvailable04/08/201106/29/2012

Contact BNL About This Technology

To: Avijit Sen<asen@bnl.gov>