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Hydrogen Storage Properties of a Combined Li3AlH6-LiBH4 System

Published online by Cambridge University Press:  01 February 2011

Young Joon Choi ,
Jun Lu ,
Hong Yong Sohn  and
Zak Fang
Young Joon Choi
Affiliation:
youngjoon.choi@utah.edu, University of Utah, Metallurgical Engineering, 135 S 1460 E Room 412, Salt Lake City, UT, 84112-0114, United States, 801-835-5907, 801-581-4937
Jun Lu
Affiliation:
jun.lu@utah.edu, University of Utah, Metallurgical Engineering, 135 S 1460 E Room 412, Salt Lake City, UT, 84112-0114, United States
Hong Yong Sohn
Affiliation:
h.y.sohn@utah.edu, University of Utah, Metallurgical Engineering, 135 S 1460 E Room 412, Salt Lake City, UT, 84112-0114, United States
Zak Fang
Affiliation:
zak.fang@utah.edu, University of Utah, Metallurgical Engineering, 135 S 1460 E Room 412, Salt Lake City, UT, 84112-0114, United States
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Abstract

Lithium based complex hydrides, including lithium aluminum hydrides and lithium borohydride (LiAlH4, Li3AlH6 and LiBH4), are among the most promising materials due to their high hydrogen contents. In the present work, we investigated the hydrogen storage properties of a new combined system of Li3AlH6-LiBH4. The samples were made with small amounts of catalyst under low energy milling conditions. Thermogravimetric analysis (TGA) of a Ti-doped Li3AlH6/2LiBH4 indicated that the degree of hydrogen release reached 7.3 wt. % by the time the sample reached 450iÆc under a heating rate of 2iÆC/min. This increased to 8.8 wt. % when the sample was held at 450iÆCfor additional 8 hours minutes under this condition. The dehydrogenation product was a mixture of LiH and AlB2. This product could be rehydrogenated up to 3.8 wt. % under 24.1 MPa hydrogen pressure and 450iÆC.

Keywords

hydrogenationthermogravimetric analysis (TGA)mechanical alloying
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1098: Symposium HH – The Hydrogen Economy , 2008 , 1098-HH03-36
Copyright
Copyright © Materials Research Society 2008

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