State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Wuhan, P. R. China , 430070.
ACS Appl Mater Interfaces. 2013 Nov 27;5(22):11535-43. doi: 10.1021/am404417g. Epub 2013 Nov 11.
Efficient membrane proton conductivity at elevated temperatures (>100 °C) and reduced humidification conditions is a critical issue hindering fuel cell commercialization. Herein, proton conducting materials consisting of high surface area acid catalyzed mesoporous silica functionalized with sulfonated dimethylphenethylchlorosilane was investigated under anhydrous conditions. The organic moiety covalently bonded to the silica substrate via active hydroxyl groups on the silica pore surface. The structure and dynamic phases of the attached organic molecule were characterized and qualitatively determined by XRD, TEM, FT-IR, and solid state NMR. The amount of grafted organic molecules was estimated to be 2.45 μmol m(-2) by carbon elemental analysis. The so-formed composite materials showed adequate thermal stability up to 300 °C as determined by TGA. Under anhydrous conditions, ionic conductivity of the composite material upon ionic liquid impregnation reaches a peak value of 1.14 × 10(-2) S cm(-1) at 160 °C associated with the activation energy of 9.24 kJ mol(-1) for proton transport.
在高温（>100°C）和低加湿条件下实现高效的膜质子电导率是阻碍燃料电池商业化的一个关键问题。在此，研究了在无水条件下由高比表面积酸催化的介孔硅烷功能化磺化二甲苯乙基氯硅烷组成的质子传导材料。有机部分通过硅烷孔表面上的活性羟基键合到硅基底上。通过 XRD、TEM、FT-IR 和固态 NMR 对附着的有机分子的结构和动态相进行了表征和定性确定。通过碳元素分析估计接枝的有机分子的量为 2.45 μmol m(-2)。通过 TGA 确定，形成的复合材料在 300°C 下具有足够的热稳定性。在无水条件下，离子液体浸渍后复合材料的离子电导率在 160°C 时达到 1.14×10(-2) S cm(-1)的峰值，与质子传输的活化能 9.24 kJ mol(-1)相关。
