Anion exchange membranes composed of perfluoroalkylene chains and ammonium-functionalized oligophenylenes

作者：Ono Hideaki; Miyake Junpei; Shimada Shigehumi; Uchida Makoto; Miyatake Kenji^*

来源：Journal of Materials Chemistry A, 2015, 3(43): 21779-21788.

DOI：10.1039/c5ta06454f

A novel & series of ammonium-containing copoIymers (QPAFs) were synthesized as anion exchange membranes for aIkaIine fueI cell appEications. The precursor copoIymers (A/l = 28.3-90.1 kDa) composed of perfluoroaIkyIene and phenyIene groups were obtained by a nick& promoted poIycondensation reaction. ChIoromethyEation and quaternization reactions of the precursors provided thin and ductlle QPAF membranes with ion exchange capacity (IEC) ranging from 0.79 to 1.74 meq g-1. The QPAF membranes exhibited a phase-separated morphoIogy based on the hydrophiIic/hydrophobic differences in the main chain structure. The QPAF membrane with an optimized copoIymer composition and IEC = 1.26 meq g(-1) showed high hydroxide ion conductivity (95.5 mS cm(-1) in water at 80 degrees C), excellent mechanicaI properties (Large eIongation at break (218%)), and reasonabIe aIkaIine stabiIity at 80 degrees C. An aIkaIine fueI cell using the QPAF as the membrane and eIectrode binder achieved the maximum power density of 139 mW cm-2 at a current density of 420 mA cm(-2).

• 出版日期2015