PTFE/Nafion-TEOS(tetraethoxysilane)複合膜的製備及性能研究

Preparation and Performance of PTFE/Nafion-TEOS(tetraethoxysilane) Composite Membranes

黃立寧(Li-Ning Huang)

指導教授 ： 余子隆

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

無資料

關鍵字

全氟磺酸樹脂 ； 四乙氧基矽烷 ； 甲醇燃料電池

並列摘要

PTFE/Nafion-TEOS（P/N-TEOS） composite membranes were prepared by impregnation PTFE/Nafion composite membrane via sol-gel processing with various concentration of tetraethoxysilane（TEOS）. The surface morphology and chemical structure of the composite membranes were investigated by SEM and FT-IR-ATR. The conductivity and the methanol permeability of the membranes were investigated by AC impedance and gas chromatography（GC）, respectively. The results show that the P/N-TEOS composite membranes had lower proton conductivity than P/N composite membrane and a lower methanol flux.　The direct methanol fuel cell（DMFC）performances and electrochemical properties of membrane electrolyte assembly（MEA）prepared using Nafion117, PTFE/Nafion composite membrane, and PTFE/Nafion-TEOS modified membranes were investigated. The open circuit voltage and the cell performance of MEA prepared from PTFE/Nafion-TEOS modified membranes were better than that prepared from unmodified PTFE/Nafion composite membrane an operating temperature of 70℃ and feed methanol concentration of 5M. The experimental results show that the modification of Nafion/PTFE composite membrane with TEOS reduces not only the proton conductivity but also the permeability of methanol. Thus the should an optimum TEOS content and optimum methanol feeding concentration DMFC operation.

並列關鍵字

Nafion ； tetraethoxysilane ； direct methanol fuel cell ； TEOS ； DMFC

參考文獻

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