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Reaction Mechanisms in the Li_3AIH_6/LiBH_4 and AI/LiBH_4 Systems for Reversible Hydrogen Storage. Part 2: Solid-State NMR Studies

Choi, Young Joon and Lu, Jun and Sohn, Hong Yong and Fang, Zhigang Zak and Kim, Chul and Bowman, Robert C., Jr. and Hwang, Son-Jong (2011) Reaction Mechanisms in the Li_3AIH_6/LiBH_4 and AI/LiBH_4 Systems for Reversible Hydrogen Storage. Part 2: Solid-State NMR Studies. Journal of Physical Chemistry C, 115 (13). pp. 6048-6056. ISSN 1932-7447. https://resolver.caltech.edu/CaltechAUTHORS:20110418-113350620

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Abstract

In Part 1, the promising hydrogen storage properties of the combined systems of Li_3AIH_6/LiBH_4 and AI/LiBH_4, exhibiting the favorable formation of AIB_2 during dehydrogenation, were presented based on TGA and XRD analyses. The present Part 2 describes the characterization of the intermediate and final products of the dehydrogenation and rehydrogenation of the above systems by multinuclear solid-state NMR characterization. This work has also verified that the presence of AI resulted in the re-formation of LiBH_4 occurring at a much lower temperature and H_2 pressure, under which conditions the dehydrogenation product from LiBH_4 alone does not show any degree of rehydrogenation. NMR studies mainly identified various reaction intermediates for LiBH_4 dehydrogenation/rehydrogenation reactions. Unlike the XRD studies, the AIB_2 formation, in particular, could not be unambiguously confirmed by NMR. ^(27)AI NMR showed that aluminum was mainly involved in various Li—AI alloy formations. The catalytic role of AI in the LiBH_4 hydrogen storage reactivity could be achieved by a reversible cycle of the AI + LiH ↔ LiAI + 1/2H_2 reaction.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp109113fDOIArticle
http://pubs.acs.org/doi/abs/10.1021/jp109113fPublisherArticle
ORCID:
AuthorORCID
Bowman, Robert C., Jr.0000-0002-2114-1713
Hwang, Son-Jong0000-0002-3210-466X
Additional Information:© 2011 American Chemical Society. Received: September 23, 2010. Revised: December 7, 2010. Published: March 10, 2011. This research was supported by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, through the Hydrogen, Fuel Cells & Infrastructure Technologies Program under Contract Numbers DE-FC36- 05GO15069 (U. Utah) and DE-AI-01-05EE11105 (Jet Propulsion Lab). 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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC36-05GO15069
Department of Energy (DOE)DE-Al-01-05EE11105
NSFDMR-9724240
NSFDMR-0520565
Issue or Number:13
Record Number:CaltechAUTHORS:20110418-113350620
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110418-113350620
Official Citation:Reaction Mechanisms in the Li3AlH6/LiBH4 and Al/LiBH4 Systems for Reversible Hydrogen Storage. Part 2: Solid-State NMR Studies Young Joon Choi, Jun Lu, Hong Yong Sohn, Zhigang Zak Fang, Chul Kim, Robert C. Bowman, Jr., and Son-Jong Hwang pp 6048–6056 Publication Date (Web): March 10, 2011 (Article) DOI: 10.1021/jp109113f
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23359
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Apr 2011 18:00
Last Modified:03 Oct 2019 02:45

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