磺酸化二氮雜萘聯苯聚醚酮填充多孔之聚四氟乙烯膜於燃料電池質子交換膜製備之應用

本研究利用多孔性聚四氟乙烯(PTFE)薄膜為基材，以低溫電漿方式處理，通入N2/H2之混合氣體，使其膜表面與孔洞壁表面活化，再浸入含離子交換性磺酸官能基(SO3-)之磺酸化二氮雜萘聯苯聚醚酮溶液中進行填充，使其薄膜具有質子交換能力，得到可使用於燃料電池系統中之質子交換膜。在掃瞄式電子顯微鏡圖中，可以明顯的看出改質過後的 PTFE 薄膜確實含浸入高分子聚電解質，並且從紅外光譜圖中能夠得到磺酸根基團的吸收波峰。經由交流阻抗分析得到薄膜中質子傳導性質，其質子傳導度約在 10-3 ~ 10-4 S/cm 之間。雖然孔洞填充膜在滲透蒸發中總滲透通量較 Nafion117 薄膜較高，但在其滲透端的甲醇濃度低於 Naion117 薄膜，且具有較低之甲醇滲透係數，有阻擋甲醇溢流的潛力。於多孔性 PTFE 薄膜內填充高分子聚電解質的方法，適用於各種電解質材料薄膜的發展，可減少電解質使用量、達到降低成本與增進效能的目標。

關鍵字

直接甲醇燃料電池；質子交換膜；聚四氟乙烯

並列摘要

Polyelectrolyte pore-filled membranes were prepared for use as proton exchange membranes in direct methanol fuel cells. The pores of a porous substrate, polytetrafluoroethylene (PTFE), were filled with sulfonated poly(phthalazinone ether ketone) (SPPEK). PTFE membranes were treated by low temperature plasma under N2/H2 environment to improve their hydrophilicity before the impregnation of SPPEK. The polyelectrolyte pore-filled membranes could reduce the problem of methanol crossover but still maintain reasonable proton conductivity. From SEM pictures and ATR-FTIR spectra, the polyelectrolyte-filled porous structure was confirmed. The membranes could conduct proton due to the presence of polyelectrolyte, and the proton conductivity ranged between 10-3 and 10-4 S/cm. Although the proton conductivity is lower than the pure polyelectrolyte, the consumption of expensive polyelectrolyte can be reduced. In addition, the thickness of the modified membranes is only 15 ~ 20 μm, the size of DMFC modules can be reduced. Modified PTFE membranes can efficiently lower the methanol permeability and thus potentially can reduce methanol crossover. The pore-filling method to impregnate polyelectrolyte into porous PTFE membranes was demonstrated in this study. It can be adapted to all kinds of polyelectrolytes to fabricate proton exchange membranes. It is expected to get adequate performance of proton exchange membranes at lower cost.

並列關鍵字

DMFC ； PEMFC ； Pore-filled ； PTFE

參考文獻

李匡邦、許東明、何東英著，光譜化學分析，楊智文化事業股份有限公司，台灣, (1997)

Byungchan, B., Y. H. Heung, K. Dukjoon, “Nafion®-graft-polystyrene sulfonic acid membranes for direct methanol fuel cells,” J. Membr. Sci., 276 (2006) 51–58

Caro, J. C., U. Lappan and K. Lunkwitz, “Sulfonation of fluoropolymers induced by electron beam irradiation,” Nuc. Instr. and Meth. in Phys. Res. B, 151 (1999-a) 181-185

Caro, J. C., U. Lappan and K. Lunkwitz, “Insertion of sulfur-containing functional groups into polytetrafluoroethylene (PTFE) by low pressure plasma treatment,” Surf. Coat. Technol., 116-119 (1999-b) 792-795

Deluca, N. W., Y. A. Elabd, “Polymer Electrolyte Membranes for the Direct Methanol Fuel Cell: A Review,” J. Polym. Sci., Part B: Polym. Phys., 44 (2006) 2201–2225

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磺酸化二氮雜萘聯苯聚醚酮填充多孔之聚四氟乙烯膜於燃料電池質子交換膜製備之應用

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