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Improving water management in gas diffusion layers through the optimization of carbon composite microporous layers.

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Title: Improving water management in gas diffusion layers through the optimization of carbon composite microporous layers.
Authors: Washington, Brian A.1 (AUTHOR) bwashin7@vols.utk.edu, Imel, Adam2 (AUTHOR) aimel@utk.edu, Goenaga, Gabriel1 (AUTHOR) ggoenaga@utk.edu, Foister, Shane1 (AUTHOR) sfoister@utk.edu, Zawodzinski, Thomas A.1,3 (AUTHOR) tzawodzi@utk.edu
Source: Journal of Power Sources. Nov2024, Vol. 621, pN.PAG-N.PAG. 1p.
Subjects: Ion-permeable membranes, Surface energy, Multiwalled carbon nanotubes, Contact angle, Carbon electrodes, Polytef
Abstract: Using the Washburn method, the wettability of microporous layer (MPL)-coated carbon-felt gas diffusion layers (GDLs) with liquids with different polarities were studied using process tensiometry. The Washburn approach allows us to study fluid uptake into the electrode pores through capillarity and the resulting liquid-solid internal contact angles. Interpretation using the Owens-Wendt analysis reveals the effects of varying proportions of hydrophobic poly(tetrafluoroethylene) (PTFE) and multi-walled carbon nanotubes (MWCNTs) in the MPL yielding solid-vapor surface energies. An optimal MPL contained a 10 wt% MWCNT/KJB carbon substrate and 10 wt% PTFE loading. This information was corroborated by evaluating these materials in anion exchange membrane fuel cells with simultaneous gas and aqueous electrolyte feed. [Display omitted] • Carbon felt electrodes were evaluated using the Washburn and Owens-Wendt methods. • MPL integration in air electrode structures is key for modified AEMFC performance. • A 10 wt% MWCNT/KJB composite substrate is the optimal material for MPL fabrication. • Increasing PTFE loading in the MPL does not impact internal pore site wettability. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 179461880
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Improving water management in gas diffusion layers through the optimization of carbon composite microporous layers.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Washington%2C+Brian+A%2E%22">Washington, Brian A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bwashin7@vols.utk.edu</i><br /><searchLink fieldCode="AR" term="%22Imel%2C+Adam%22">Imel, Adam</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> aimel@utk.edu</i><br /><searchLink fieldCode="AR" term="%22Goenaga%2C+Gabriel%22">Goenaga, Gabriel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ggoenaga@utk.edu</i><br /><searchLink fieldCode="AR" term="%22Foister%2C+Shane%22">Foister, Shane</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sfoister@utk.edu</i><br /><searchLink fieldCode="AR" term="%22Zawodzinski%2C+Thomas+A%2E%22">Zawodzinski, Thomas A.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> tzawodzi@utk.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Power+Sources%22">Journal of Power Sources</searchLink>. Nov2024, Vol. 621, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Ion-permeable+membranes%22">Ion-permeable membranes</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+energy%22">Surface energy</searchLink><br /><searchLink fieldCode="DE" term="%22Multiwalled+carbon+nanotubes%22">Multiwalled carbon nanotubes</searchLink><br /><searchLink fieldCode="DE" term="%22Contact+angle%22">Contact angle</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+electrodes%22">Carbon electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Polytef%22">Polytef</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Using the Washburn method, the wettability of microporous layer (MPL)-coated carbon-felt gas diffusion layers (GDLs) with liquids with different polarities were studied using process tensiometry. The Washburn approach allows us to study fluid uptake into the electrode pores through capillarity and the resulting liquid-solid internal contact angles. Interpretation using the Owens-Wendt analysis reveals the effects of varying proportions of hydrophobic poly(tetrafluoroethylene) (PTFE) and multi-walled carbon nanotubes (MWCNTs) in the MPL yielding solid-vapor surface energies. An optimal MPL contained a 10 wt% MWCNT/KJB carbon substrate and 10 wt% PTFE loading. This information was corroborated by evaluating these materials in anion exchange membrane fuel cells with simultaneous gas and aqueous electrolyte feed. [Display omitted] • Carbon felt electrodes were evaluated using the Washburn and Owens-Wendt methods. • MPL integration in air electrode structures is key for modified AEMFC performance. • A 10 wt% MWCNT/KJB composite substrate is the optimal material for MPL fabrication. • Increasing PTFE loading in the MPL does not impact internal pore site wettability. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jpowsour.2024.235326
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Ion-permeable membranes
        Type: general
      – SubjectFull: Surface energy
        Type: general
      – SubjectFull: Multiwalled carbon nanotubes
        Type: general
      – SubjectFull: Contact angle
        Type: general
      – SubjectFull: Carbon electrodes
        Type: general
      – SubjectFull: Polytef
        Type: general
    Titles:
      – TitleFull: Improving water management in gas diffusion layers through the optimization of carbon composite microporous layers.
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            NameFull: Washington, Brian A.
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            NameFull: Imel, Adam
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            NameFull: Goenaga, Gabriel
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            NameFull: Foister, Shane
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            NameFull: Zawodzinski, Thomas A.
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            – D: 30
              M: 11
              Text: Nov2024
              Type: published
              Y: 2024
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              Value: 621
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            – TitleFull: Journal of Power Sources
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