Anhydrous Proton Conducting Inorganic-Organic Composite Membranes Based on Tetraethoxysilane/Ethyl-Triethoxysilane/Trimethylphosphate and 1-Butyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide

作者：Lakshminarayana G^*; Nogami Masayuki; Kityk I V

来源：Journal of the Electrochemical Society, 2010, 157(6): B892-B899.

DOI：10.1149/1.3383025

In this paper, we report on inorganic-organic composite membranes with anhydrous proton conduction prepared by the sol-gel process with tetraethoxysilane/ethyl-triethoxysilane/trimethylphosphate and 1-butyl-3-methylimidazolium-bis (trifluoromethylsulfonyl)imide ([BMI][BTSI]) ionic liquid as precursors. The Fourier transform IR spectroscopy, (31)P, (1)H, and (13)C NMR, and thermogravimetric and differential thermal analysis measurements confirmed that the membranes possess good chemical stability and are thermally stable up to 310 C. Thermal stability was considerably enhanced by the presence of the inorganic SiO(2) framework and the stability of [BTSI] anion. The conductivity of all the fabricated membranes was measured from -30 to 150 degrees C, and a high conductivity of 5 x 10(-3) S/cm was measured for the 40 wt % [BMI][BTSI] ionic liquid doped membrane at 150 degrees C under anhydrous conditions. The hydrogen permeability was decreased from 1.84 x 10(-11) to 2.7 x 10(-12) mol/cm s Pa for the 40 wt % [BMI][BTSI] ionic liquid doped hybrid membrane during temperature increment from 20 to 150 degrees C. For 40 wt % ionic liquid doped hybrid membrane, membrane electrode assemblies were fabricated, and a maximum power density value of 0.17 mW/cm(2) at 0.42 mA/cm(2) as well as a current density of 0.67 mA/cm(2) were achieved at 150 degrees C under nonhumidified conditions.

• 出版日期2010