| The effect of H<sub>2</sub> partial pressure on the reaction progression and reversibility of lithium containing multi-component destabilized hydrogen storage systems. | |
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MedLine Citation:
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PMID: 21755995 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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It is known that the reaction path for the decomposition of LiBH<sub>4</sub> : MgH<sub>2</sub> systems is dependent on whether decomposition is performed under vacuum or under a hydrogen pressure (typically 1-5 bar). However, the sensitivity of this multi-component hydride system to partial pressures of H<sub>2</sub> has not been investigated before. A combination of in-situ powder neutron and X-ray diffraction (deuterides were used for the neutron experiments) have shed light on the effect of low partial pressures of hydrogen on the decomposition of these materials. Different partial pressures have been achieved through the use of different vacuum systems. It was found that all the samples decomposed to form Li-Mg alloys regardless of the vacuum system used or sample stoichiometry of the multicomponent system. However, upon cooling the reaction products, the alloys showed phase instability in all but the highest efficiency pumps (i.e. lowest base pressures), with the alloys reacting to form LiH and Mg. This work has significant impact on the investigation of Li-containing multi-component systems and the reproducibility of results if different dynamic vacuum conditions are used, as this affects the apparent amount of hydrogen evolved (as determined by ex situ experiments) but also the reversibility of the system. |
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Authors:
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Tobias Edward Cameron Price; David M Grant; David Weston; Thomas C Hansen; Lene Mosegaard Arnbjerg; Dorthe Bomholdt Ravnsbæk; Torben R Jensen; Gavin S Walker |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-14 |
Journal Detail:
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Title: Journal of the American Chemical Society Volume: - ISSN: 1520-5126 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503056 Medline TA: J Am Chem Soc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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