title: Preparation and characterization of nonaqueous proton-conducting membranes with protic ionic liquids.
abstract: Hybrid Nafion membranes were successfully fabricated by incorporating with protic imidazolium ionic liquids 1-(2-aminoethyl)-3-methylimidazolium chloride ([MimAE]Cl), 1-(2-hydroxylethyl)-3-methylimidazolium chloride ([MimHE]Cl), and 1-carboxylmethyl-3-methylimidazolium chloride ([MimCM]Cl) for high-temperature fuel cells. The composite membranes were characterized by impedance spectroscopy, small-angle X-ray scattering (SAXS), scanning electronic microscopy (SEM), and thermogravimetric analysis (TGA). The incorporated protic ionic liquids enhance the doping of phosphoric acid (PA) and result in a relatively high ionic conductivity. The Nafion/10 wt % [MimAE]Cl/PA composite membrane exhibits an ionic conductivity of 6.0 mS/cm at 130 °C without humidification. [MimAE]Cl can swell the Nafion matrix more homogeneously than [MimHE]Cl or [MimCM]Cl, which results in a better ionic conductivity. It is notable that the composite Nafion/IL/PA membranes have a better thermal stability than the pristine Nafion membranes.
authors.affiliation: Key laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, P. R. China.
authors.forename: Fei
authors.initials: F
authors.lastname: Lu
authors.forename: Xinpei
authors.initials: X
authors.lastname: Gao
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Yan
authors.forename: Hejun
authors.initials: H
authors.lastname: Gao
authors.forename: Lijuan
authors.initials: L
authors.lastname: Shi
authors.forename: Han
authors.initials: H
authors.lastname: Jia
authors.forename: Liqiang
authors.initials: L
authors.lastname: Zheng