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Perfluorinated sulfonic acid (PFSA) ionomers have been widely used as representative polymer electrolyte membrane materials for fuel cells and water/salined water electrolyses. The PFSA ionomers membranes need to satisfy complicated transport behaviors to small molecules including gases and ionic species. That is, the PFSA ionomers membranes have to transport protons as fast as possible, while the membranes should act as hydrogen barriers, since the permeated gas induces thermal degradation of cathode catalyst resulting in rapid reduction in fuel cell performances. In this study, it is disclosed that these permeation behaviors can be easily tunable by controlling membrane processing histories even though the ionomers have the same chemical architecture and equivalent weight.
