Size engineering of perfluorinated sulfonic acid ionomers via supercritical fluid dispersion and its fuel cell and water electrolysis membrane applications
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Perfluorinated sulfonic acid (PFSA) ionomers have been widely used for both membrane and electrode binder materials in galvanic and electrolytic cell applications owing to their proton transport capability and chemical durability. In this study, ionomer size engineering is conducted in benign solvent atmospheres via supercritical fluid dispersion techniques. The size characteristics of the dispersed ionomers are systematically correlated with gas transport behaviors through the solidified polymeric materials. Finally, electrochemical contributions of the size-controlled ionomers are disclosed when the tailored ionomers are used for different target applications.