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The effect of carbon and silicon-based additives on the hydrogen storage properties of Lithium Borohydride

Vines, Joshua Edwin (2017)
Ph.D. thesis, University of Birmingham.

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Abstract

LiBH\(_4\) was added to a number of different non-reactive additives in order to investigate their influence on the hydrogen storage properties of LiBH\(_4\).
Graphite is a cheap and abundant material that has been used to destabilize hydrogen storage materials such as LiH. Ball milling graphite under Ar was shown to induce a higher amorphous content compared to milling under H\(_2\). The addition of LiBH\(_4\) to graphite milled under Ar resulted in a reduction of 102°C in the decomposition temperature of
LiBh\(_4\).
The effect of porous additives was investigated through the incorporation of LiBH\(_4\) into zeolite templated carbon (ZTC) and porous silicon. Confinement in these scaffolds resulted in a decrease in the decomposition temperature of LiBH\(_4\) by 125°C. The smaller pore size of ZTC was found to have the greatest effect on the H\(_2\) onset and cyclic stability of LiBh\(_4\).
The pre-melting of LiBh\(_4\) into porous scaffolds was shown to eliminate B\(_2\)H\(_6\) release during decomposition. No correlation between the surface area of the additives and decomposition temperature of LiBH\(_4\) was observed. Although none of the materials studied in this work meet the United States DoE targets, confinement of LiBH\(_4\) in porous structures offers a promising approach to unlocking its potential.

Type of Work:Ph.D. thesis.
Supervisor(s):Book, David
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:7542
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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