Proton transport in choline dihydrogen phosphate/H3PO4 mixtures Rana, Usman Ali, Bayley, Paul M., Vijayaraghavan, R., Howlett, Patrick, MacFarlane, Douglas R. and Forsyth, Maria 2010, Proton transport in choline dihydrogen phosphate/H3PO4 mixtures, Physical chemistry chemical physics, vol. 12, no. 37, pp. 11291-11298, doi: 10.1039/C0CP00156B. Attached Files Name Description MIMEType Size Downloads Title Proton transport in choline dihydrogen phosphate/H3PO4 mixtures Formatted title Proton transport in choline dihydrogen phosphate/H3PO4 mixtures Author(s) Rana, Usman Ali Bayley, Paul M. Vijayaraghavan, R. Howlett, Patrick orcid.org/0000-0002-2151-2932 MacFarlane, Douglas R. Forsyth, Maria orcid.org/0000-0002-4273-8105 Journal name Physical chemistry chemical physics Volume number 12 Issue number 37 Start page 11291 End page 11298 Total pages 8 Publisher Royal Society of Chemistry Place of publication Cambridge, England Publication date 2010 ISSN 1463-9076 1463-9084 Summary Mixtures of the plastic crystal material choline dihydrogen phosphate [Choline][DHP] and phosphoric acid, from 4.5 mol% to 18 mol% H3PO4, were investigated and shown to have significantly higher proton conductivity compared to the pure [Choline][DHP]. This was particularly evident from the electrochemical hydrogen reduction reaction and the proton NMR diffusion measurements, in addition to ionic conductivity measured from the impedance spectroscopy. The ionic conductivity was observed to increase by more than an order of magnitude in phase I (i.e. the highest temperature solid phase in [Choline][DHP]) reaching up to 10−2 S cm−1. The multinuclear NMR spectroscopy data suggest that, at least on the timescale of the NMR measurement, the H+ cations and [DHP] anions are equivalent in both phases. The pulsed field gradient NMR diffusion measurements of the 18 mol% acid sample indicate that all three ions are mobile, however the H+ diffusion coefficient is an order of magnitude higher than for the [Choline] cation or the [DHP] anion, and therefore conduction in these materials is dominated by proton conductivity. The thermal stability, as measured by TGA, is unaffected with increasing acid additions and remains high; i.e. no significant mass loss below 200 °C. Language eng DOI 10.1039/C0CP00156B Field of Research 030304 Physical Chemistry of Materials 091205 Functional Materials 091299 Materials Engineering not elsewhere classified Socio Economic Objective 850401 Fuel Cells (excl. Solid Oxide) HERDC Research category C1.1 Refereed article in a scholarly journal Copyright notice ©2010, Owner Societies Persistent URL http://hdl.handle.net/10536/DRO/DU:30031081 Document type: Journal Article Collection: Institute for Technology Research and Innovation Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 08 Nov 2010, 10:30:30 EST Mon, 08 Nov 2010, 10:46:26 EST Mon, 08 Nov 2010, 10:48:19 EST Thu, 11 Dec 2014, 16:48:17 EST Filtered Full Citation counts:   Cited 30 times in TR Web of Science Cited 30 times in Scopus Search Google Scholar Access Statistics: 571 Abstract Views, 1 File Downloads  -  Detailed Statistics Created: Mon, 08 Nov 2010, 10:30:28 EST by Leanne Swaneveld

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