mz9b00615_si_001.pdf (8.49 MB)
Polyaromatic Perfluorophenylsulfonic Acids with High Radical Resistance and Proton Conductivity
journal contribution
posted on 2019-09-16, 13:05 authored by Na Rae Kang, Thanh Huong Pham, Patric JannaschWe report on the
straightforward metal-free synthesis of poly(p-terphenyl
perfluorophenylsulfonic acid)s by efficient
superacid-catalyzed Friedel–Crafts polycondensations of commercially
available perfluoroacetophenone and p-terphenyl,
followed by sulfonation of the pendant pentafluorophenyl groups via
a selective and quantitative thiolation–oxidation procedure.
The stiff and well-defined polymer structure with precisely sequenced
and highly acidic units induces efficient ionic clustering, restricted
water uptake and swelling, excellent resistance against radical attack,
and very high proton conductivity. At 120 °C, the conductivity
reaches 40 and 232 mS cm–1 at 50 and 90% relative
humidity, respectively, which very closely matches the benchmark Nafion
NR212 membrane. The properties are further tuned by copolymerizations.
Overall, the results demonstrate that these materials possess a very
attractive combination of characteristics for use as high-performance
proton-exchange membranes for fuel cells and water electrolyzers.
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resistancefuel cellssulfonationwater electrolyzerscombinationmaterialpendant pentafluorophenyl groupsthiolationwater uptakeProton Conductivitypolycondensationperfluorophenylsulfonicprocedurecmproton-exchange membranesacidic unitsPolyaromatic Perfluorophenylsulfonic Acidscopolymerizationmetal-free synthesispolymer structuremSterphenylcharacteristicbenchmark Nafion NR 212 membraneproton conductivityHigh Radical ResistanceFriedelperfluoroacetophenonesuperacid-catalyzed
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