New polybenzimidazoles for producing medium-temperature proton-exchange membranes
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H3PO4-doped proton-exchange membranes based on benzimidazole-2-yl-substituted polybenzimidazoles have been obtained and studied. Attempts have been made to stabilize the mechanical properties of doped membranes by crosslinking of the initial polymers. The treatment with sulfuric acid is selected as the most efficient crosslinking method. Target characteristics (proton conductivity and performance in the fuel cell) of a membrane based on crosslinked benzimidazole-2-yl-substituted polybenzimidazole have been investigated. The proton conductivity of the membrane is estimated as 5.2 × 10−2 S/cm at 160°C. The current density in a hydrogen—air fuel cell based on the developed membrane is found to be 0.21 A/cm2 at 160°C, 0.6 V, with a total platinum content on electrodes of 1 mg/cm2.
KeywordsPolymer Science Series DMAA Membrane Electrode Assembly Urotropine Pyrophosphoric Acid
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