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Potential and Reaction Mechanism of Li−Mg−Al−N−H System for Reversible Hydrogen Storage

Lu, Jun and Fang, Zhigang Zak and Sohn, Hong Yong and Bowman, Robert C., Jr. and Hwang, Son-Jong (2007) Potential and Reaction Mechanism of Li−Mg−Al−N−H System for Reversible Hydrogen Storage. Journal of Physical Chemistry C, 111 (44). pp. 16686-16692. ISSN 1932-7447.

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Complex metal hydrides are attracting much attention as a class of candidate materials for hydrogen storage. Lithium-based complex hydrides, including lithium aluminum hydrides (LiAlH_4 and Li_3AlH_6), are among the most promising materials, owing to their high hydrogen contents. In the present work, we investigated the dehydrogenation/rehydrogenation reactions of a combined system of Li_3AlH_6 and Mg(NH_2)_2, which has a theoretical hydrogen capacity of 6.5 wt %. Thermogravimetric analysis of hydrogenated 2/3Al−Li_2Mg(NH)2 (doped with 4 wt % TiCl_3) indicated that a large amount of hydrogen (∼6.2 wt %) can be stored under 300 °C and 172 bar of hydrogen pressure. The FT-IR and NMR results showed that the reaction between Li_3AlH_6 and Mg(NH_2)_2 is reversible. Further, a short-cycle experiment has demonstrated that the new combined material system of alanates and amides can maintain its hydrogen storage capacity upon cycling of the dehydrogenation/rehydrogenation reactions.

Item Type:Article
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URLURL TypeDescription
Bowman, Robert C., Jr.0000-0002-2114-1713
Hwang, Son-Jong0000-0002-3210-466X
Additional Information:© 2007 American Chemical Society. Received 20 June 2007. Published online 11 October 2007. Published in print 1 November 2007. This research was supported by the U.S. Department of Energy (DOE) under contract numbers DE-FC36-05GO15069 (U. Utah) and DE-AI-01-06EE11105 (JPL) and was also partially performed at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautical and Space Administration (NASA). The NMR facility at Caltech was supported by the National Science Foundation (NSF) under Grant Number 9724240 and partially supported by the MRSEC Program of the NSF under Award Number DMR-520565. We thank W. Luo and J. W. Reiter for providing several Li−Mg−N−H reference materials.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC36-05GO15069
Department of Energy (DOE)DE-AI-01-06EE11105
Issue or Number:44
Record Number:CaltechAUTHORS:20170616-142024319
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Official Citation:Potential and Reaction Mechanism of Li−Mg−Al−N−H System for Reversible Hydrogen Storage Jun Lu, Zhigang Zak Fang, Hong Yong Sohn, Robert C. Bowman, Jr., and Son-Jong Hwang The Journal of Physical Chemistry C 2007 111 (44), 16686-16692 DOI: 10.1021/jp074814e
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78295
Deposited By: Ruth Sustaita
Deposited On:16 Jun 2017 22:06
Last Modified:03 Oct 2019 18:07

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