Ionomer Thin Films in PEM Fuel Cells

Kusoglu, Ahmet

doi:10.1007/978-1-4939-2493-6_1021-1

Cited by 7 publications

(28 citation statements)

References 110 publications

(449 reference statements)

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“…On the other hand, if only the form factor is used for modeling the water domains, the experimental data cannot be properly described. The weak correlation effects between PEMs can by found in [9,54].…”

Section: Sans On Hydrated Films -Variation Of Hydration Levelmentioning

confidence: 99%

The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS

Schiavone

Iwase

Takata

et al. 2019

Preprint

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Membranes based on sulfonated synditoactic polystyrene were thoroughly characterized by contrast variation SANS over a wide Q-range in dry and hydrated states. The film samples were prepared by solid-state sulfonation that allowed a uniform sulfonation of only the amorphous phase while preserving the crystallinity of the membrane. The samples were loaded with different guest molecules in either the amorphous (fullerenes) or the crystalline (toluene) regions, in order to vary the neutron contrast or to reproduce the conditions enabling an increased resistance of the membranes to chemical decomposition. The use of uni-axially deformed film samples and contrast variation with different H2O/D2O mixtures allowed for the identification and characterization of different structural levels with sizes between nm and μm, which form and evolve in the membrane morphology in dry and hydrated states and produce scattering features on different detection sectors and at different detection distances after the sample, depending on their size and orientation.

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Section: Sans On Hydrated Films -Variation Of Hydration Levelmentioning

confidence: 99%

The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS

Schiavone

Iwase

Takata

et al. 2019

Preprint

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“…While preferential orientation of domains has been reported in spin-cast thin-films, 2,[27][28][29][30][31] this study reveals that the origin of such structural anisotropy is rooted in the film formation, during which crystallites and nano-domains orient with the substrate. Likely, this is due to the stiff rodlike aggregates aligning parallel to both interfaces as the solution evaporates and transitions into a thin film.…”

Section: Main Textmentioning

confidence: 58%

“…The unique structure-driven multi-functionality of PFSA ionomers makes it the prototypical material for energy conversion devices; thus, there is a rich literature on PFSAs as a bulk membrane (10-50 μm). 1,2 Moreover, there has been a growing interest in understanding ionomers as thin-films (< 100 nm thickness), which stems from the need to understand their behavior in the catalyst layers (CLs) of a fuel cell or electrolyzer. [1][2][3][4][5] In CLs, ionomer thin-films act as a binder and conducting media, transporting reactants and products to and from the catalytic sites (e.g., platinum) supported on carbon.…”

Section: Main Textmentioning

confidence: 99%

“…1,2 Moreover, there has been a growing interest in understanding ionomers as thin-films (< 100 nm thickness), which stems from the need to understand their behavior in the catalyst layers (CLs) of a fuel cell or electrolyzer. [1][2][3][4][5] In CLs, ionomer thin-films act as a binder and conducting media, transporting reactants and products to and from the catalytic sites (e.g., platinum) supported on carbon. 3,6 CLs are cast from inks, where ionomer and catalyst-coated carbon particles are dispersed in a mixture of solvents, typically water/alcohol mixtures.…”

Section: Main Textmentioning

confidence: 99%

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Evolution of Ionomer Morphology from Dispersion to Film: An in Situ X-ray Study

Dudenas

Kusoglu

2019

Macromolecules

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Ion-conducting polymers (ionomers) have been extensively studied in solution, as membranes and substrate-supported thin films for various electrochemical energy conversion devices, including fuel-cells and electrolyzers. Formation of an ionomer film from a solution, however, is not well understood, despite its importance for fabrication of electrodes in energy devices. Here, the evolution of the perfluorinated sulfonic acid (PFSA) morphology upon casting from a solution is observed using in-situ grazing-incidence small-and wide-angle x-ray scattering (GISAXS/GIWAXS). Aggregate interactions in dispersion directly impact the hydrophilicdomain network of the cast film and the onset of crystallization occur simultaneously with the solution-to-film transition, but continue to evolve on different timescales. In addition, confinement is shown to induce anisotropic morphology at multiple lengthscales. These results show promise for elucidating the role of casting parameters, drying protocols, and ionomersolvent interactions in governing film morphology and open new avenues for establishing structure/processing/property relationships for ionomer films and modifying their transport functionality at catalytic interfaces.

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“…The adsorption of benzene and other aromatic compounds on Pt surfaces is well known [91,97] and may play a significant role since all currently available polymer electrolytes contain phenyl groups. In the case of the previously discussed PEMFCs, the impact of phenyl adsorption on Pt has not been an issue because perfluorinated polymer electrolytes without phenyl groups are predominant [98]. These phenyl group adsorptions can be even more significant as state-of-the-art ammonium-functionalized aryl ether-free polyaromatic ionomers recently reviewed by E.J.…”

Section: Anion-exchange Membranes Fuel Cells (Aemfc)mentioning

confidence: 99%

Ionizing Radiation for Preparation and Functionalization of Membranes and Their Biomedical and Environmental Applications

Casimiro

Leal²,

Pereira

et al. 2019

Membranes

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The use of ionizing radiation processing technologies has proven to be one of the most versatile ways to prepare a wide range of membranes with specific tailored functionalities, thus enabling them to be used in a variety of industrial, environmental, and biological applications. The general principle of this clean and environmental friendly technique is the use of various types of commercially available high-energy radiation sources, like 60Co, X-ray, and electron beam to initiate energy-controlled processes of free-radical polymerization or copolymerization, leading to the production of functionalized, flexible, structured membranes or to the incorporation of functional groups within a matrix composed by a low-cost polymer film. The present manuscript describes the state of the art of using ionizing radiation for the preparation and functionalization of polymer-based membranes for biomedical and environmental applications.

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Ionomer Thin Films in PEM Fuel Cells

Cited by 7 publications

References 110 publications

The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS

The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS

Evolution of Ionomer Morphology from Dispersion to Film: An in Situ X-ray Study

Ionizing Radiation for Preparation and Functionalization of Membranes and Their Biomedical and Environmental Applications

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