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Freeze-dried ammonia borane-polyethylene oxide composites: Phase behaviour and hydrogen release

Ploszajski, AR; Billing, M; Nathanson, AS; Vickers, M; Bennington, SM; (2018) Freeze-dried ammonia borane-polyethylene oxide composites: Phase behaviour and hydrogen release. International Journal of Hydrogen Energy , 43 (11) pp. 5645-5656. 10.1016/j.ijhydene.2018.01.128. Green open access

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Abstract

A solid-state hydrogen storage material comprising ammonia borane (AB) and polyethylene oxide (PEO) has been produced by freeze-drying from aqueous solutions from 0% to 100% AB by mass. The phase mixing behaviour of AB and PEO has been investigated using X-ray diffraction which shows that a new ‘intermediate’ crystalline phase exists, different from both AB and PEO, as observed in our previous work (Nathanson et al., 2015). It is suggested that hydrogen bonding interactions between the ethereal oxygen atom (–O–) in the PEO backbone and the protic hydrogen atoms attached to the nitrogen atom (N–H) of AB molecules promote the formation of a reaction intermediate, leading to lowered hydrogen release temperatures in the composites, compared to neat AB. PEO also acts to significantly reduce the foaming of AB during hydrogen release. A temperature-composition phase diagram has been produced for the AB-PEO system to show the relationship between phase mixing and hydrogen release.

Type: Article
Title: Freeze-dried ammonia borane-polyethylene oxide composites: Phase behaviour and hydrogen release
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijhydene.2018.01.128
Publisher version: http://dx.doi.org/10.1016/j.ijhydene.2018.01.128
Language: English
Additional information: © 2018 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Electrochemistry, Energy & Fuels, Chemistry, Ammonia borane, Polyether, Hydrogen storage, Hydrogen generation, Dehydrogenation, Phase diagram, THERMAL-DECOMPOSITION, STORAGE MATERIAL, BORON-NITRIDE, DEHYDROGENATION, BORAZINE, BOROHYDRIDE, DIFFRACTION, MECHANISM, DIBORANE, KINETICS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10048009
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