Preparation and Application of Sulfonated Poly(arylene ether sulfone)/Heteropolyacid (H3PW12O40) Composite Membranes for Proton Exchange Membrane Fuel Cell
|關鍵字:||側鏈磺化聚醚?燃料電池;質子交換膜;雜多酸;質子導電度;sulfonated poly(arylene ether sulfone);fuel cell;proton exchange membrane;heteropolyacids(HPA);proton conductivity||公開日期:||2012||摘要:||此研究是將雜多酸(HPA)系列的磷鎢酸加入本實驗室所開發之高分子材料─側鏈磺酸化聚醚碸，製成有機/無機複合薄膜並應用於燃料電池質子交換膜中。側鏈磺化聚醚碸的製備方式是將已開發之側鏈結構帶有磺酸根之單體bis[4-fluoro-3-（4-sulfophenyl）phenyl] sulfone (SPDS)與疏水性單體4,4''- difluorodiphenylsulfone (S)、4-(4-(4-Methoxyphenoxy)phenoxy)phenol (DH-3AE)利用親核性芳香取代反應成功合成出Random copolymer側鏈磺酸化聚醚碸共聚物，再將磷鎢酸添加至此材料的溶液中，經熱烘成膜後製成有機/無機複合薄膜。此複合薄膜經由熱性質分析、膜材含水率、尺寸穩定性、質子導電度、掃描式電子顯微鏡(SEM)以及質子交換膜燃料電池（PEMFC）發電效能來分析此有機/無機複合薄膜的質子交換膜特性。實驗結果發現添加無機物磷鎢酸後比原高分子材料的含水率還要高，且在質子導電度以及放電效能上皆有明顯提升的現象。
In this study, SPAES/HPA composite membranes were prepared for proton exchange membrane fuel cell (PEMFCs). Phosphotungstic acid, one kind of heteropolyacids (HPA), which was added into polymer materials made from sulfonated poly(arylene ether sulfone)s (SPAES) with pendent sulfonic acid was studied for being applied to H2/O2 PEMFC. This kind of random copolymer side-chain sulfonated poly(arylene ether sulfone)s was prepared by aromatic nucleophilic substitution（SNAr）polycondensation using the hydrophobic monomer 4,4''-difluorodiphenylsulfone (S), 4-(4-(4-Methoxyphenoxy) phenoxy)phenol (DH-3AE) and hydrophilic monomer bis[4-fluoro-3-（4-sulfophenyl）phenyl] sulfone (SPDS) all that we had successfully synthesized. SPAES/HPA composite membranes were prepared by casting procedure, using SPAES polymer solution and phosphotungstic acid mixtures. The physical and chemical properties include thermal properties of the membrane, water uptake, dimensional stability, proton conductivity, morphology and fuel cell power performances were measured and discussed in our study. The experimental results found that adding inorganic phosphotungstic acid into this polymer solution showed a higher water uptake compare with the native polymer materials. It was also found that it could obviously improve proton conductivity as well as performances.
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