Equilibrium Aggregation in Perfluorinated Ionomer Solutions

Cirkel, P. A.; Okada, Tatsuhiro; Kinugasa, Shinichi

doi:10.1021/ma981421s

Cited by 58 publications

(49 citation statements)

References 9 publications

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“…Electron tomography performed in a highangle annular dark-field scanning transmission electron microscope (HAADF-STEM) is a powerful method to characterize nanomaterials in 3D at the nanometre scale from a series of 2D electron microscopy images 14,15 . Indeed, the contrast in HAADF-STEM images depends monotonically on the sample thickness, which is consistent with tomography criteria for the reconstruction and shows some chemical sensitivity 16 . This makes it ideal to study materials with very different average atomic numbers.…”

Section: Resultssupporting

confidence: 80%

Three-dimensional analysis of Nafion layers in fuel cell electrodes

López‐Haro¹,

Guétaz²,

Printemps³

et al. 2014

Nat Commun

333

264

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Proton exchange membrane fuel cell is one of the most promising zero-emission power sources for automotive or stationary applications. However, their cost and lifetime remain the two major key issues for a widespread commercialization. Consequently, much attention has been devoted to optimizing the membrane/electrode assembly that constitute the fuel cell core. The electrodes consist of carbon black supporting Pt nanoparticles and Nafion as the ionomer binder. Although the ionomer plays a crucial role as ionic conductor through the electrode, little is known about its distribution inside the electrode. Here we report the three-dimensional morphology of the Nafion thin layer surrounding the carbon particles, which is imaged using electron tomography. The analyses reveal that doubling the amount of Nafion in the electrode leads to a twofold increase in its degree of coverage of the carbon, while the thickness of the layer, around 7 nm, is unchanged.

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Section: Resultssupporting

confidence: 80%

Three-dimensional analysis of Nafion layers in fuel cell electrodes

López‐Haro¹,

Guétaz²,

Printemps³

et al. 2014

Nat Commun

333

264

View full text Add to dashboard Cite

show abstract

“…The estimated L in Fig. 5b is in accordance with previous reports (L~10 2 e10 4 nm) [35], and reflects the temperature dependence of the full length of the polymer aggregates. The L values increase substantially to T > 120 C indicating that the displacement of a-relaxation to lower frequencies represents a conformation transition of perfluorosulfonate ionomer chains.…”

Section: Estimation Of the Polymer Backbone Lengthsupporting

confidence: 91%

Interplay between α-relaxation and morphology transition of perfluorosulfonate ionomer membranes

Matos

Santiago

Muccillo

et al. 2015

Journal of Power Sources

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“…Viscometric study of diluted solutions of Nafion showed an increase in the reduced viscosity at low concentration, which was attributed to an increase in the polymer extension, resulting from the decrease of charge screening by other chains [27]. Dynamic light scattering experiments [28][29][30] have also been carried out in both aqueous solutions and organic solutions with different concentration. Different sizes of Nafion aggregates were found in all aqueous solutions and most of organic solutions.…”

Section: Introductionmentioning

confidence: 99%