Preparation and Study of Sulfonated Co-Polynaphthoyleneimide Proton-Exchange Membrane for a H2/Air Fuel Cellстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 30 декабря 2020 г.
Аннотация:The sulfonated polynaphthoyleneimide polymer (co-PNIS70/30)was prepared by copolymerizationof 4,40-diaminodiphenyl ether-2,20-disulfonic acid (ODAS) and 4,4’-methylenebisanthranilic acid(MDAC) with ODAS/MDAC molar ratio 0.7/0.3. High molecular weight co-PNIS70/30 polymerswere synthesized either in phenol or in DMSO by catalytic polyheterocyclization in the presence ofbenzoic acid and triethylamine. The titration reveals the ion-exchange capacity of the polymer equalto 2.13 meq/g. The membrane films were prepared by casting polymer solution. Conductivities ofthe polymer films were determined using both in- and through-plane geometries and reached ~96and ~60 mS/cm, respectively. The anisotropy of the conductivity is ascribed to high hydration of thesurface layer compared to the bulk. SFGNMR diusometry shows that, in the temperature range from213 to 353 K, the 1H self-diusion coecient of the co-PNIS70/30 membrane is about one third of thediusion coecient of Nafion® at the same humidity. However, temperature dependences of protonconductivities of Nafion® and of co-PNIS70/30 membranes are nearly identical. Membrane–electrodeassemblies (MEAs) based on co-PNIS70/30 were fabricated by dierent procedures. The optimal MEAswith co-PNIS70/30 membranes are characterized by maximum output power of ~370 mW/cm2 at80 C. It allows considering sulfonated co-PNIS70/30 polynaphthoyleneimides membrane attractivefor practical applications.