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Proton Conductivity Enhancement by Nanostructural Control of Poly(benzimidazole)-Phosphoric Acid Adducts


  • We gratefully acknowledge the help of Mrs. A. Fuchs with the preparation of the anhydrous crystalline phosphoric acid. M. Antonietti is acknowledged for fruitful discussions. Financial support from the ENERCHEM project of the MPS is acknowledged. Supporting Information is available online from Wiley InterScience or from the authors.


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Mesoporous polybenzimidazole doped with phosphoric acid shows enhanced proton conductivity compared to an equivalent, nonporous membrane. The introduction of a defined nanostructure into crosslinked poly(benzimidazole)/phosphoric acid composites is thus a promising approach towards membranes of high temperature stability suitable for fuel cell applications.

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