Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

Santos, Leslie; Powers, Devon; Wycisk, Ryszard; Pintauro, Peter

doi:10.3390/membranes10100250

Title: Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

Journal Article · Wed Sep 23 00:00:00 EDT 2020 · Membranes

DOI:https://doi.org/10.3390/membranes10100250· OSTI ID:1848429

Santos, Leslie ^[1]; Powers, Devon ^[1];

^[1];

^[1]

Vanderbilt Univ., Nashville, TN (United States). Dept. of Chemical and Biomolecular Engineering

Electrospinning was employed to fabricate composite membranes containing perfluorosulfonic acid (PFSA) ionomer, poly(vinylidene fluoride) (PVDF) reinforcement and a sulfonated silica network, where the latter was incorporated either in the PFSA matrix or in the PVDF fibers. The best membrane, in terms of proton conductivity, was made by incorporating the sulfonated silica network in PFSA fibers (Type-A) while the lowest conductivity membrane was obtained when sulfonated silica was incorporated into the reinforcing PVDF fibers (Type-B). A Type-A membrane containing 65 wt.% PFSA with an embedded sulfonated silica network (at 15 wt.%) and with 20 wt.% PVDF reinforcing fibers proved superior to the pristine PFSA membrane in terms of both the proton conductivity in the 30–90% RH at 80 °C (a 25–35% increase) and lateral swelling (a 68% reduction). In addition, it was demonstrated that a Type-A membrane was superior to that of a neat 660 EW perfluoroimide acid (PFIA, from 3M Co.) films with respect to swelling and mechanical strength, while having a similar proton conductivity vs. relative humidity profile. This study demonstrates that an electrospun nanofiber composite membrane with a sulfonated silica network added to moderately low EW PFSA fibers is a viable alternative to an ultra-low EW fluorinated ionomer PEM, in terms of properties relevant to fuel cell applications.

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Research Organization:: 3M Company, Maplewood, MN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0006362

OSTI ID:: 1848429

Journal Information:: Membranes, Vol. 10, Issue 10; ISSN 2077-0375

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Title: Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

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