Silica/Ionic Liquid離子導電膜之製備及性質研究

The Preparation and Properties of Silica/Ionic Liquid Ionic Conductive Membrane

邱群倫(Chun-Lun Chiu)

指導教授 ： 陳玉惠

中原大學/理學院/化學研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000511

摘要

本研究係以溶膠-凝膠法(Sol-gel method)以矽酸乙酯Tetraethylorthosilicate (TEOS)為前驅物和離子熔液(1-butyl-4-methyl imidazolium tetra-fluoroborate, [BMIM][BF4])，並添加不同質子酸做為催化劑及氫質子的來源，製備Silica/Ionic Liquid離子導電膜(Ionic Conductive Membrane)。探討Silica/Ionic Liquid離子導電膜的結構、熱行為、離子導電度及離子交換當量等性質。從傅立葉轉換紅外線光譜(Fourier infrared spectroscopy, FTIR)及固態核磁共振(Solid state 29Si-NMR)測試可發現Silica/Ionic Liquid離子導電膜具有良好的化學穩定性及擁有高SiO2骨架縮合程度。熱分析包含TG和DTG皆可證明Silica/Ionic Liquid離子導電膜的熱穩定性良好，可達到250℃以上，主要是因為無機相SiO2骨架及離子熔液高的熱穩定性。本研究亦探討質子酸對該Silica/Ionic Liquid離子導電膜之影響；結果顯示：加入HCl(aq)、H2SO4(aq)及H3PO4(aq)後，離子導電度及離子交換當量的值皆會上升。所有製備膜之離子導電度在100℃且無加濕的條件下，添加磷酸的Silica/Ionic Liquid離子導電膜具有最高之導電度為2.19×10-1 S/cm。再將添加磷酸的Silica/Ionic Liquid離子導電膜組成膜電極組應用於燃料電池上，在15.8 mA/cm2可得到最大能量密度為5.4 mW/cm2，在30度時最好的電流密度為21.1 mA/cm2。

關鍵字

離子熔液 ； 離子導電膜 ； 二氧化矽

並列摘要

Ionic conductive membranes were prepared by sol-gel process with tetraethylorthosilicate (TEOS), 1-butyl-4-methylimidazolium tetra-fluoroborate [BMIM][BF4] ionic liquid as precursors, and various acids as catalysts and proton sources. These Silica/Ionic Liquid ionic conductive membranes were studied with respect to their structural, thermal, ion conductivity, and ion exchange capacity (IEC) properties. The Fourier transform infrared spectroscopy (FT-IR) and 29Si nuclear magnetic resonance (NMR) measurements have shown good chemical stability, and condensation of SiO2 with [BMIM][BF4] ionic liquid in the studied Silica/Ionic Liquid ionic conductive membranes. Thermal analysis including TG and DTG confirmed that the membranes were thermally stable up to 250 ℃. Thermal stability of the conductive membranes was significantly enhanced by the presence of inorganic SiO2 framework and high stability of [BMIM][BF4] ionic liquid. The effect of addition of the proton acids on the membrane property had been studied. The results show that the ion conductivity and IEC value with addition of HCl(aq), H2SO4(aq) or H3PO4(aq) are enhanced. Ion conductivity of all the prepared membranes was measured from 30 ℃ to 100 ℃, and high conductivity of 2.19×10−1 S/cm was obtained for Phosphoric acid doped Silica/Ionic Liquid ionic conductive membrane, at 100 ℃ under anhydrous conditions. For phosphoric acid doped ionic conductive membrane, membrane electrode assemblies were prepared and a maximum power density value of 5.4 mW/cm2 at 15.8 mA/cm2as well as a current density of 21.1 mA/cm2 were obtained at 30 ℃ when utilized in a H2/O2 fuel cell.

並列關鍵字

Ionic liquid ； Ionic conductive membrane ； Silica

參考文獻

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