Abstract
We demonstrate that small and narrow hydrophilic conducting domain morphology in sulfonated aromatic membranes leads to much better fuel cell performance at medium temperature and low humidity conditions than those with larger hydrophilic domains. A comparison of three types of sulfonated poly(arylene ether sulfone)s (SPAES) with random, block, and graft architecture indicates that small hydrophilic domain sizes (<5nm) appear to be important in supporting water retention under low relative humidity (RH) conditions intended for medium temperature (>100°C) fuel cell applications. The graft copolymer outperformed both a random copolymer and multiblock copolymer at 120°C and 35% RH fuel cell operating conditions due to capillary condensation of water within the 3–5nm hydrophilic domains.
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