Proton exchange membranes modified with sulfonated silica nanoparticles for direct methanol fuel cells

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• 作者：Yu-Huei Su ; Ying-Ling Liu ; Yi-Ming Sun ; Juin-Yih Lai ; Da-Ming Wang ; Yan Gao ; Baijun Liu ; Michael D. Guiver
• 关键词：Proton exchange membranes ; Direct methanol fuel cell ; Nanoparticles
• 刊名：Journal of Membrane Science
• 出版年：2007
• 出版时间：15 June 2007
• 年：2007
• 卷：296
• 期：1-2
• 页码：21-28
• 全文大小：1080 K

文摘

Nanocomposite proton exchange membranes were prepared from sulfonated poly(phthalazinone ether ketone) (sPPEK) and various amounts of sulfonated silica nanoparticles (silica-SO₃H). The use of silica-SO₃H compensates for the decrease in ion exchange capacity of membranes observed when non-sulfonated nano-fillers are utilized. The strong –SO₃H/–SO₃H interaction between sPPEK chains and silica-SO₃H particles leads to ionic cross-linking in the membrane structure, which increases both the thermal stability and methanol resistance of the membranes. The membrane with 7.5 phr of silica-SO₃H (phr = g of silica-SO₃H/100 g of sPPEK in membranes) exhibits low methanol crossover, high bound-water content, and a proton conductivity of 3.6 fold increase to that of the pristine sPPEK membrane.