Feasibility and performance of the mixture of MgH2 and LiNH2 (1:1) as a hydrogen-storage material

A 1:1molar ratio mixture of MgH2 and LiNH2 was predicted to release 8.1wt.% H under moderate conditions. This binary mixture of MgH2-LiNH2 was found to be a multinary complex system induced by mechanical ball milling, due to the metathesis reaction between the initial components. It was found that d...

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Bibliographic Details
Published in:Acta materialia 2011-08, Vol.59 (14), p.5821-5831
Main Authors: HU, J. J, RÖHM, E, FICHTNER, M
Format: Article
Language:English
Subjects:
Applied sciences
Ball milling
Complex systems
Decomposition reactions
Dehydrogenation
Desorption
Emission
Exact sciences and technology
Hydrogen storage
Metals. Metallurgy
Metathesis
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Summary:A 1:1molar ratio mixture of MgH2 and LiNH2 was predicted to release 8.1wt.% H under moderate conditions. This binary mixture of MgH2-LiNH2 was found to be a multinary complex system induced by mechanical ball milling, due to the metathesis reaction between the initial components. It was found that dehydrogenation from this system was initialized by the formation of LiH and Mg(NH2)2 via such metathesis. The hydrogen sorption performance studied in this work shows a strong influence of the ball-milling parameters which determine the subsequent dehydrogenation pathways. An adequate ball milling facilitates hydrogen release, whereas insufficient milling results in a sluggish hydrogen desorption and severe NH3 emission. A maximum amount of 7.3% was obtained with formation of the ternary nitride LiMgN; however, desorption temperatures of up to 600 degree C had to be applied.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2011.05.059