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A novel proton conducting polymer electrolyte membrane, poly(arylene ether) ionomer containing sulfofluorenyl groups (SPE-1), was subjected to long term fuel cell operation. High durability of the SPE-1 membrane was confirmed by single cell test at 80°C and at a constant current density of 0.2A/cm 2 . Under 90% RH operation, superior hydrolytic stability of the SPE-1 membrane was demonstrated...
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