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Impact of DAA/water composition on PFSA ionomer conformation

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F21%3A00532096" target="_blank" >RIV/61389013:_____/21:00532096 - isvavai.cz</a>

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0021979720311024?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0021979720311024?via%3Dihub</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.jcis.2020.08.058" target="_blank" >10.1016/j.jcis.2020.08.058</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Impact of DAA/water composition on PFSA ionomer conformation

  • Original language description

    Performance of a proton exchange membrane fuel cell (PEMFC) is significantly determined by the structure and composition of the electrode layer. Electrode layers are formed from inks consisting of platinum-doped carbon black particles, perfluorosulfonic acid (PFSA) ionomer and a dispersing solvent. Interaction between these materials mainly influences suspension stability, ionomer conformation and therewith layer morphology. We characterize the interplay between a short sidechain (SSC) PFSA ionomer (Aquivion® D79-25BS) and a solvent mixture (diacetone alcohol (DAA) and water with different weight ratios) by using Hansen solubility/dispersibility parameters (HSP) and by experimental tests. It was found that HSPs are well suitable to describe the ionomer/solvent interactions. In particular, the HSP difference in terms of the hydrogen bonds is responsible for the poor affinity between ionomer and solvent at low DAA concentrations. With increasing DAA content the affinity between ionomer and solvent increases as indicated by better matching HSPs. For an ionomer concentration of 4 wt%, Aquivion always forms molecular solutions for all DAA-in-water mixing ratios. Self-organization of the ionomer molecules changes from densely packed/collapsed molecules with highly deprotonated sulfonic acid side groups at low DAA concentrations to unfolded Aquivion molecules with a low dissociation degree of the sulfonic acid groups at high DAA concentrations.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10404 - Polymer science

Result continuities

  • Project

    <a href="/en/project/LM2015064" target="_blank" >LM2015064: Czech National Node to the European Infrastructure for Translational Medicine</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2021

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Colloid and Interface Science

  • ISSN

    0021-9797

  • e-ISSN

    1095-7103

  • Volume of the periodical

    582

  • Issue of the periodical within the volume

    15 January

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    11

  • Pages from-to

    883-893

  • UT code for WoS article

    000600666100011

  • EID of the result in the Scopus database

    2-s2.0-85090329776