title: A novel proton conductor of imidazole-aluminium phosphate hybrids in the solid state.
abstract: 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(H(2)PO(4))(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.
authors.affiliation: Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Aichi 455-8555, Japan.
authors.forename: Masanobu
authors.initials: M
authors.lastname: Nakayama
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Sugiura
authors.forename: Tomokatsu
authors.initials: T
authors.lastname: Hayakawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nogami