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.

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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, PatrickORCID iD for Howlett, Patrick
MacFarlane, Douglas R.
Forsyth, MariaORCID iD for Forsyth, Maria
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
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
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