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• W2983092942 abstract "A major challenge in the development of anion exchange membranes for fuel cells is the design and synthesis of highly stable (chemically and mechanically) conducting membranes. Membranes that can endure highly alkaline environments while rapidly transporting hydroxides are desired. Herein, we present a design using cross-linked polymer membranes containing ionic highways along charge-delocalized pyrazolium cations and homoconjugated triptycenes. These ionic highway membranes show improved performance. Specifically, a conductivity of 111.6 mS cm–1 at 80 °C was obtained with a low 7.9% water uptake and 0.91 mmol g–1 ion exchange capacity. In contrast to existing materials, ionic highways produce higher conductivities at reduced hydration and ionic exchange capacities. The membranes retain more than 75% of their initial conductivity after 30 days of an alkaline stability test. The formation of ionic highways for ion transport is confirmed by density functional theory and Monte Carlo studies. A single cell with platinum metal catalysts at 80 °C showed a high peak density of 0.73 W cm–2 (0.45 W cm–2 from a silver-based cathode) and stable performance throughout 400 h tests." @default.
• W2983092942 created "2019-11-22" @default.
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• W2983092942 date "2019-11-04" @default.
• W2983092942 modified "2023-10-12" @default.
• W2983092942 title "Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells" @default.
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• W2983092942 doi "https://doi.org/10.1021/jacs.9b08749" @default.
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