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Investigation of proton dynamics and the proton transport pathway in choline dihydrogen phosphate using solid-state NMR

Cahill, Lindsay S. and Rana, Usman Ali and Forsyth, Maria and Smith, Mark E. (2010) Investigation of proton dynamics and the proton transport pathway in choline dihydrogen phosphate using solid-state NMR. Physical chemistry chemical physics, 12 (20). pp. 5431-5438.

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Abstract

Choline dihydrogen phosphate has previously been shown to be a good ionic conductor as well as an excellent host for acid doping, leading to high proton conductivities required for e.g., electrochemical devices including proton membrane fuel cells and sensors. A combination of variable-temperature H-1 solid-state NMR and 2D NMR pulse sequences, including P-31 and C-13 CODEX and H-1 BaBa, show that the proton conduction mechanism primarily involves assisted transport via a restricted three-site motion of the phosphate unit around the P-O bond that is hydrogen bonded to the choline and exchange of protons between these anions. In other words, proton transport at ambient temperatures appears to occur most favorably along the crystallographic b axis, from phosphate dimer to dimer. At elevated temperatures exchange between the protons of the hydroxyl group on the choline cation and the hydrogen-bonded dihydrogen phosphate groups also contributes to the structural diffusion of the protons in this solid state conductor.

Item Type: Article
Journal or Publication Title: Physical chemistry chemical physics
Uncontrolled Keywords: Choline -- Transport properties ; Protons -- Transport properties ; Nuclear magnetic resonance spectroscopy
Subjects: Q Science > QC Physics
Departments: VC's Office
ID Code: 52817
Deposited By: ep_importer_pure
Deposited On: 27 Feb 2012 14:16
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52817

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