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Mixed anion amides for hydrogen storage

Hewett, David R. (2012)
Ph.D. thesis, University of Birmingham.

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Abstract

Metal hydride materials have attracted much interest for their potential use as hydrogen storage materials. Complex hydrides are amongst the most promising due to their high gravimetric storage capacities and favourable de/rehydrogenation conditions. Here, mixed anion complex hydrides are investigated both through halide doping of LiNH\(_2\) and Li\(_2\)NH, and though a mixed LiNH\(_2\)-LiBH\(_4\) system.
The reaction of LiNH\(_2\) and Li\(_2\)NH with lithium or magnesium chloride, bromide and iodide has been shown to form a series of amide- and imide-halide phases. The structures of these phases were investigated through powder diffraction methods as well as Raman spectroscopy. The hydrogen releasing properties of these materials were investigated through reaction with LiH and MgH\(_2\); while the equivalent hydrogenation reactions were also tested. In both cases these materials performed more favourably than the pure LiNH\(_2\)-LiH system. The lithium ion conductivity of these materials was also investigated; it was shown that the most conducting materials were also the quickest to release and uptake hydrogen.

The LiNH\(_2\)-LiBH\(_4\) system was studied, with particular focus on the decomposition product, Li\(_3\)BN\(_2\). All three known polymorphs of this compound were shown to be able to form by the reaction of \(_2\)LiNH\(_2\) + LiBH\(_4\) by carefully changing the reaction conditions. Further stages of this system were investigated through reaction of Li\(_2\)NH and Li\(_3\)N with LiBH\(_4\). Here the products from these reactions were studied along with the thermal desorption properties of the systems.

Type of Work:Ph.D. thesis.
Supervisor(s):Anderson, P.A. (Paul Alexander) (1965-)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Subjects:QC Physics
QD Chemistry
Institution:University of Birmingham
ID Code:3696
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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