Properties and Fuel Cell Performance of a Nanofiber Composite Membrane with 660 Equivalent Weight Perfluorosulfonic Acid

Ballengee, Jason; Haugen, Gregory M.; Hamrock, Steven J.; Pintauro, Peter N.

doi:10.1149/2.088304jes

Cited by 23 publications

(30 citation statements)

References 34 publications

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“…One attractive strategy of generating an optimum balance between ion conduction and physicochemical stability in electrolyte membranes is to create a "microphase-separated" morphology in polymers made of highly ordered ion-nanochannels and a hydrophobic phase. An example is the fabrication of ion-conductive polymer nanofibers, demonstrating distinctive electrochemical, physicochemical, and thermal properties owing to their high specific surface area and polymer orientation along the nanofiber direction 159,160 . The use of a reinforcing, mechanically strong nanofiber morphology can minimize in-plane swelling changes during wet(on)/off(-dry) fuel cell operation and thus extend the device lifetime 161 .…”

Section: Electrolyte Membranementioning

confidence: 99%

Nanotechnology for environmentally sustainable electromobility

et al. 2016

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Electric vehicles (EVs) powered by lithium ion batteries (LIBs) or proton exchange membrane hydrogen fuel cells (PEMFCs) offer important potential climate change mitigation effects when combined with clean energy sources. The development of novel nanomaterials may bring about the next wave of technical improvements for LIBs and PEMFCs. If the next generation of EVs is to lead to not only reduced emissions during use but also environmentally sustainable production chains, the research on nanomaterials for LIBs and PEMFCs should be guided by a lifecycle perspective. In this Review, we describe an environmental lifecycle screening framework tailored to assess nanomaterials for electromobility. By applying this framework, we offer an early evaluation of the most promising nanomaterials for LIBs and PEMFCs and their potential contributions to the environmental sustainability of EV lifecycles. Potential environmental trade-offs and gaps in nanomaterials research are identified to provide guidance for future nanomaterial developments for electromobility.

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Section: Electrolyte Membranementioning

confidence: 99%

Nanotechnology for environmentally sustainable electromobility

et al. 2016

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“…Membranes composed of uncharged reinforcing polymer fibers surrounded by an ionomer matrix worked exceedingly well in hydrogen/air fuel cell MEAs, with high conductivity, low gas crossover, and low in-plane swelling, with excellent durability in accelerated wet/dry cycling experiments [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Nafion/PVDF nanofiber composite membranes for regenerative hydrogen/bromine fuel cells

Park

Wycisk

Pintauro

2015

Journal of Membrane Science

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Nanofiber composite proton exchange membranes were fabricated and their properties measured, for possible use in a regenerative hydrogen/bromine fuel cell. The membranes were prepared from dual nanofiber mats, composed of Nafion ® perfluorosulfonic acid (PFSA) ionomer for proton transport and polyvinylidene fluoride (PVDF) for mechanical reinforcement. Two composite membranes structures containing Nafion volume fractions ranging from 0.30 to 0.65 were investigated: (1) Nafion nanofibers embedded in a PVDF matrix (N(fibers)/PVDF) and (2) PVDF nanofibers embedded in a Nafion matrix (N/PVDF(fibers)). The in-plane conductivity for films equilibrated in water and 2.0 M HBr scaled linearly with Nafion volume fraction for both morphologies. The through-plane proton conductivity of N(fibers)

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“…The PEO fully dissolved, whereas the PFSA formed a clear micellar solution. PEO was used here to increase chain entanglement which enabled nanofiber electrospinning of the PFSA dispersion [ 33 , 34 , 35 , 36 ]. The PEO solution was then added to the PFSA dispersion, resulting in a mixture that contained 20 wt.% polymer with a 99/1 (wt./wt.)…”

Section: Methodsmentioning

confidence: 99%

Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

2020

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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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Properties and Fuel Cell Performance of a Nanofiber Composite Membrane with 660 Equivalent Weight Perfluorosulfonic Acid

Cited by 23 publications

References 34 publications

Nanotechnology for environmentally sustainable electromobility

Nanotechnology for environmentally sustainable electromobility

Nafion/PVDF nanofiber composite membranes for regenerative hydrogen/bromine fuel cells

Electrospun Hybrid Perfluorosulfonic Acid/Sulfonated Silica Composite Membranes

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