Hybrid inorganic-organic nanocomposite polymer electrolytes based on Nafion and fluorinated TiO₂ for PEMFCs

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• 作者：Vito Di Noto^a ; ¹ ; ^{vito.dinoto@unipd.it} ; Mauro Bettiol^b ; Fabio Bassetto^b ; Nicola Boaretto^a ; Enrico Negro^a ; Sandra Lavina^a ; Federico Bertasi^a
• 关键词：Hybrid inorganic-organic proton-conducting membranes ; Nafion ; Polymer electrolyte membrane fuel cells ; Dynamical mechanic analyses ; Vibrational spectroscopy ; Fabrication and testing of membrane-electrode assemblies
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：6169-6181
• 文件大小：1455 K

摘要

In this report, three hybrid inorganic-organic proton-conducting membranes based on a novel fluorinated titania labeled TiO₂F dispersed in Nafion were prepared. The mass fraction of TiO₂F nanofiller ranged between 0.05 and 0.15. The water uptake and the proton exchange capacity of the membranes were determined; the membranes were further characterized by TG, DMA and FT-IR ATR investigations. Finally, the hybrid membranes were used in the fabrication of membrane-electrode assemblies (MEAs), which were tested in operating conditions as a function of the back pressure and of the hydration degree of the reagents streams. It was demonstrated that, with respect to pristine recast Nafion, at 25%RH the MEA fabricated with the membrane including a mass fraction of TiO₂F equal to 0.10 yielded a higher maximum power density (0.206聽W聽cm^鈭? vs. 0.121聽W聽cm^鈭?). Finally, it was proposed a coherent structural model of this family of hybrid membranes accounting for both the properties determined from 鈥渆x-situ鈥?characterizations and for the performance obtained from measurements in a single fuel cell in operating conditions.