Journal ArticleDOI
Cross-correlated humidity-dependent structural evolution of Nafion thin films confined on a platinum substrate.
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TLDR
The cross-correlation among the film macro-expansion from ellipsometry, the micro-exp expansion from GISAXS, and the water distribution from neutron reflectometry explains the observed non-affine behavior of the film which can be attributed to the randomly and spatially non-uniform distribution of water domains.Citations
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Engineering Catalyst Layers for Next-Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods
Theo M. Suter,Keenan Smith,Jennifer Hack,Lara Rasha,Zahra Rana,Gyen Ming A. Angel,Paul R. Shearing,Thomas S. Miller,Dan J. L. Brett +8 more
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Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure.
TL;DR: This review introduces related polymer materials and molecular design using lyotropic liquid crystals and hydrogen bond networks for high proton conduction and outlines the use of substrate surfaces and external fields, such as pressure and centrifugal force, for organizing structures and molecularly oriented structures.
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Transport and Electrochemical Interface Properties of Ionomers in Low-Pt Loading Catalyst Layers: Effect of Ionomer Equivalent Weight and Relative Humidity.
TL;DR: This is the first study to examine humidity-dependent oxygen reduction reaction (ORR) kinetics in-situ for CLs with different ionomers and, as expected, strong influence of humidity on proton conduction is observed.
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Water Content and Ionic Conductivity of Thin Films of Different Anionic Forms of Anion Conducting Ionomers
Udit N. Shrivastava,Avital Zhegur-Khais,Maria Bass,Sapir Willdorf-Cohen,Viatcheslav Freger,Dario R. Dekel,Kunal Karan +6 more
TL;DR: In polymer electrolyte based electrochemical devices such as electrolyzers and fuel cells, ionomers in the catalyst layers are present as ultra-thin films coating the electrochemically a... as discussed by the authors.
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Dynamic Emergence of Nanostructure and Transport Properties in Perfluorinated Sulfonic Acid Ionomers
Adlai Katzenberg,Adlai Katzenberg,Debdyuti Mukherjee,Peter Dudenas,Peter Dudenas,Yoshiyuki Okamoto,Ahmet Kusoglu,Miguel A. Modestino +7 more
TL;DR: In this article, the role of fluoropolymer physicochemical properties in the dynamic evolution of nanostructure and ionic conductivity in perfluorinated sulfonic acid ionomer thin films was investigated.
References
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Journal ArticleDOI
State of Understanding of Nafion
TL;DR: Light scattering experiments revealed that the radius of gyration had a linear dependence on the molar mass of the aggregates, which suggests that the particles are in the form of rods or ribbons, or at least some elongated structure.
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On the development of proton conducting polymer membranes for hydrogen and methanol fuel cells
TL;DR: In this paper, the authors explain the transport properties and the swelling behaviour of NAFION and different sulfonated polyetherketones in terms of distinct differences on the microstructures and in the p K a of the acidic functional groups.
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Water Uptake by and Transport Through Nafion® 117 Membranes
Thomas A. Zawodzinski,C. R. Derouin,Susan D. Radzinski,Ruth J. Sherman,Van T. Smith,T. E. Springer,Shimshon Gottesfeld +6 more
TL;DR: In this article, the diffusion coefficient and relaxation time of water in the membrane and the protonic conductivity of the membrane as functions of membrane water content were measured, and the ratio of water molecules carried across the membrane per proton transported, the electro-osmotic drag coefficient, was determined for a limited number of water contents.
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New Insights into Perfluorinated Sulfonic-Acid Ionomers
Ahmet Kusoglu,Adam Z. Weber +1 more
TL;DR: In this comprehensive review, recent progress and developments on perfluorinated sulfonic-acid (PFSA) membranes have been summarized on many key topics, including structure/transport correlations and modeling, composite PFSA membranes, degradation phenomena, and PFSA thin films.
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Proton Conductivity of Nafion 117 as Measured by a Four‐Electrode AC Impedance Method
TL;DR: In this article, the proton conductivity of Nafion 117 was measured under various conditions of humidity and temperature using a four-electrode ac impedance method, and it varied strongly with the humidity and heat-treatment of the membrane.