Analysis of Ionomer Distribution and Pt/C Agglomerate Size in Catalyst Layers by Two-Stage Ion-Beam Processing

Ionomer distribution in catalyst layers (CLs) of polymer electrolyte fuel cells has garnered much attention because it affects proton and gas transfer. In this study, a novel visualization method of the overall through-plane ionomer and platinum-supported carbon (Pt/C) distributions in the CLs using...

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Published inJournal of the Electrochemical Society Vol. 167; no. 12; pp. 124513 - 124520
Main Authors Suzuki, Takahiro, Okada, Shinya, Tsushima, Shohji
Format Journal Article
LanguageEnglish
Published IOP Publishing 09.01.2020
Subjects
Catalyst layer
Fuel Cells - PEM
Ion beam processing
Ionomer distribution
Porous structure
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Abstract Ionomer distribution in catalyst layers (CLs) of polymer electrolyte fuel cells has garnered much attention because it affects proton and gas transfer. In this study, a novel visualization method of the overall through-plane ionomer and platinum-supported carbon (Pt/C) distributions in the CLs using two-stage ion-beam processing is proposed. The first stage is the formation of a flat and smooth cross-section using a broad ion beam. The second stage is the selective removal of the materials in the CL by a focused-ion beam. Scanning ion microscopic images were obtained after the first and second stages. The ionomer and Pt/C distributions were then obtained by image processing. CLs were prepared with the ionomer-to-carbon (I/C) ratio varied from 0.5 to 3.0. The effect of the dispersion process on the structure of the CL was also studied. With increasing I/C ratio, a thin ionomer layer was formed at the interface with the polymer electrolyte membrane. This behavior is attributed to deposition of ionomer during solvent evaporation. Ionomer thickness, agglomerate size of Pt/C, and pore size were evaluated. The agglomerate size of Pt/C was found to be affected by both I/C ratio and the dispersion process.
AbstractList Ionomer distribution in catalyst layers (CLs) of polymer electrolyte fuel cells has garnered much attention because it affects proton and gas transfer. In this study, a novel visualization method of the overall through-plane ionomer and platinum-supported carbon (Pt/C) distributions in the CLs using two-stage ion-beam processing is proposed. The first stage is the formation of a flat and smooth cross-section using a broad ion beam. The second stage is the selective removal of the materials in the CL by a focused-ion beam. Scanning ion microscopic images were obtained after the first and second stages. The ionomer and Pt/C distributions were then obtained by image processing. CLs were prepared with the ionomer-to-carbon (I/C) ratio varied from 0.5 to 3.0. The effect of the dispersion process on the structure of the CL was also studied. With increasing I/C ratio, a thin ionomer layer was formed at the interface with the polymer electrolyte membrane. This behavior is attributed to deposition of ionomer during solvent evaporation. Ionomer thickness, agglomerate size of Pt/C, and pore size were evaluated. The agglomerate size of Pt/C was found to be affected by both I/C ratio and the dispersion process.
Author Okada, Shinya
Suzuki, Takahiro
Tsushima, Shohji
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  givenname: Takahiro
  orcidid: 0000-0002-1487-867X
  surname: Suzuki
  fullname: Suzuki, Takahiro
  email: suzuki@mech.eng.osaka-u.ac.jp
  organization: Osaka University Department of Mechanical Engineering, Graduate School of Engineering, Suita-shi, Osaka 565-0871, Japan
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  givenname: Shinya
  surname: Okada
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  givenname: Shohji
  surname: Tsushima
  fullname: Tsushima, Shohji
  organization: Osaka University Department of Mechanical Engineering, Graduate School of Engineering, Suita-shi, Osaka 565-0871, Japan
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Snippet Ionomer distribution in catalyst layers (CLs) of polymer electrolyte fuel cells has garnered much attention because it affects proton and gas transfer. In this...
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StartPage 124513
SubjectTerms Catalyst layer
Fuel Cells - PEM
Ion beam processing
Ionomer distribution
Porous structure
Title Analysis of Ionomer Distribution and Pt/C Agglomerate Size in Catalyst Layers by Two-Stage Ion-Beam Processing
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