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Issue 7, 2012
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Plastic crystal phases with high proton conductivity

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Abstract

The addition of up to 4 mol% of the strong acids, trifluoromethane sulfonic acid (TfOH) and bis-trifluoromethanesulfonyl imide [HN(Tf)2], to the organic ionic plastic crystal (OIPC) [Choline][DHP] has been shown to dramatically increase the ionic conductivity by up to three orders of magnitude whilst still retaining the crystalline structure of the OIPC matrix. This enhanced proton diffusivity led to a significant proton reduction reaction in the electrochemical measurements. Powder XRD and DSC thermal analyses strongly suggest that these mixtures are single phase, crystalline materials. The work here also confirms that an increase in TfOH acid concentration (8 mol% and 12 mol%) results in a higher content of the amorphous phase as previously observed for the H3PO4/[Choline][DHP] system.

Graphical abstract: Plastic crystal phases with high proton conductivity

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Publication details

The article was received on 18 Oct 2011, accepted on 01 Dec 2011 and first published on 23 Dec 2011


Article type: Paper
DOI: 10.1039/C2JM15288F
J. Mater. Chem., 2012,22, 2965-2974

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    Plastic crystal phases with high proton conductivity

    U. A. Rana, R. Vijayaraghavan, D. R. MacFarlane and M. Forsyth, J. Mater. Chem., 2012, 22, 2965
    DOI: 10.1039/C2JM15288F

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