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  1. Article ; Online: On the Properties of Nafion Membranes Recast from Dispersion in N -Methyl-2-Pyrrolidone

    Ekaterina Yu. Safronova / Daria Yu. Voropaeva / Anna A. Lysova / Oleg V. Korchagin / Vera A. Bogdanovskaya / Andrey B. Yaroslavtsev

    Polymers, Vol 14, Iss 5275, p

    2022  Volume 5275

    Abstract: Perfluorosulfonic acid Nafion membranes are widely used as an electrolyte in electrolysis processes and in fuel cells. Changing the preparation and pretreatment conditions of Nafion membranes allows for the optimization of their properties. In this work, ...

    Abstract Perfluorosulfonic acid Nafion membranes are widely used as an electrolyte in electrolysis processes and in fuel cells. Changing the preparation and pretreatment conditions of Nafion membranes allows for the optimization of their properties. In this work, a Nafion-NMP membrane with a higher conductivity than the commercial Nafion ® 212 membrane (11.5 and 8.7 mS∙cm −1 in contact with water at t = 30 °C) and a comparable hydrogen permeability was obtained by casting from a Nafion dispersion in N -methyl-2-pyrrolidone. Since the ion-exchange capacity and the water uptake of these membranes are similar, it can be assumed that the increase in conductivity is the result of optimizing the Nafion-NMP microstructure by improving the connectivity of the pores and channels system. This leads to a 27% increase in the capacity of the membrane electrode assembly with the Nafion-NMP membrane compared to the Nafion ® 212 membrane. Thus, the method of obtaining a Nafion membrane has a great influence on its properties and performance of fuel cells based on them.
    Keywords Nafion membrane ; membrane casting ; proton conductivity ; fuel cell ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Nafion/Surface Modified Ceria Hybrid Membranes for Fuel Cell Application

    Polina A. Yurova / Viktoria R. Malakhova / Ekaterina V. Gerasimova / Irina A. Stenina / Andrey B. Yaroslavtsev

    Polymers, Vol 13, Iss 2513, p

    2021  Volume 2513

    Abstract: Low chemical durability of proton exchange membranes is one the main factors limiting their lifetime in fuel cells. Ceria nanoparticles are the most common free radical scavengers. In this work, hybrid membranes based on Nafion-117 membrane and sulfonic ... ...

    Abstract Low chemical durability of proton exchange membranes is one the main factors limiting their lifetime in fuel cells. Ceria nanoparticles are the most common free radical scavengers. In this work, hybrid membranes based on Nafion-117 membrane and sulfonic or phosphoric acid functionalized ceria synthesized from various precursors were prepared by the in situ method for the first time. Ceria introduction led to a slight decrease in conductivity of hybrid membranes in contact with water. At the same time, conductivity of membranes containing sulfonic acid modified ceria exceeded that of the pristine Nafion-117 membrane at 30% relative humidity (RH). Hydrogen permeability decreased for composite membranes with ceria synthesized from cerium (III) nitrate, which correlates with their water uptake. In hydrogen-air fuel cells, membrane electrode assembly fabricated with the hybrid membrane containing ceria synthesized from cerium (IV) sulfate exhibited a peak power density of 433 mW/cm 2 at a current density of 1080 mA/cm 2 , while operating at 60 °C and 70% RH. It was 1.5 times higher than for the pristine Nafion-117 membrane (287 mW/cm 2 at a current density of 714 mA/cm 2 ).
    Keywords Nafion ; hybrid membranes ; surface modification ; ceria ; ionic conductivity ; fuel cell ; Organic chemistry ; QD241-441
    Language English
    Publishing date 2021-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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