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Issue 20, 2011
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A novel proton conductor of imidazolealuminium phosphate hybrids in the solid state

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Anhydrous proton transport at temperatures above 100 °C has attracted considerable attention in the development of fuel cells that operate at intermediate temperatures. Liquid-state imidazole (ImH) is known to be a fast anhydrous proton conductor above 100 °C; however, evaporation and severe conductivity drops above and below its melting point (∼90 °C), respectively, are major drawbacks to ImH. In this paper, we report a novel solid-state anhydrous ImH–Al(H2PO4)3 (AlP) hybrid material prepared via a simple synthesis using mechanical milling. This solid-state hybrid exhibits relatively a high ionic conductivity of ∼0.1 mS cm−1 at 100 °C and remarkably a small activation energy of 0.23 eV. In addition, the ImH–AlP hybrid material provides a means of overcoming both temperature-dependent drawbacks to pure ImH: (1) the ImH–AlP hybrid is thermally stable up to 130 °C, and (2) the hybrid material maintains high ionic conductivity below the melting point of ImH.

Graphical abstract: A novel proton conductor of imidazole–aluminium phosphate hybrids in the solid state

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Publication details

The article was received on 06 Dec 2010, accepted on 05 Mar 2011 and first published on 11 Apr 2011

Article type: Paper
DOI: 10.1039/C0CP02789H
Citation: Phys. Chem. Chem. Phys., 2011,13, 9439-9444
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    A novel proton conductor of imidazolealuminium phosphate hybrids in the solid state

    M. Nakayama, Y. Sugiura, T. Hayakawa and M. Nogami, Phys. Chem. Chem. Phys., 2011, 13, 9439
    DOI: 10.1039/C0CP02789H

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