Composition and evaluation of single-layer electrode proton exchange membrane fuel cells for mass transfer analysis

Suzuki, Tsuneo; Miyauchi, Toshimitsu; Hayase, Masanori; Tsushima, Shohji

doi:10.1299/jtst.2016jtst0043

Cited by 4 publications

(5 citation statements)

References 22 publications

(20 reference statements)

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“…The resistance ratio (Revap/Rsed) was 1.7. 400 S/m, which was obtained from the conductivity measurement of a fabricated porous layer (Suzuki et al, 2015(Suzuki et al, , 2016b. The conductivity of the dispersion medium with ionomer (the low-conductivity layer) was 0.35 S/m, which was obtained from Fig.…”

Section: An Effect Of Materials Distribution In the Thickness Directiomentioning

confidence: 99%

Simultaneous in situ measurements and numerical analysis of mass transfer in polymer electrolyte fuel cell electrode slurries during drying

Suzuki

Nagai

Tsushima

2021

JTST

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Section: An Effect Of Materials Distribution In the Thickness Directiomentioning

confidence: 99%

Simultaneous in situ measurements and numerical analysis of mass transfer in polymer electrolyte fuel cell electrode slurries during drying

Suzuki

Nagai

Tsushima

2021

JTST

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“…The structure and resultant mass transport properties of the CLs used in PEFCs strongly affect cell performance. [1][2][3][4][5] The structure of a typical CL consists of catalystsupported carbon, an ionomer, and pores, which form paths for electrons, protons, and reactant gas molecules, respectively. All reactant substances are transported to the catalyst particles, and generated water is transferred from the catalyst.…”

mentioning

confidence: 99%

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

Suzuki

Okada

Tsushima

2020

J. Electrochem. Soc.

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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.

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“…Two parallel microchannels were fabricated on a silicon wafer having mirror plane by microfabrication techniques to compose a microfluidic device as follows. 57 Patterning of the microchannels was conducted by photolithography on a mirror-polished silicon wafer covered with a thin silicon oxide layer. The microchannels were fabricated by deep reactive-ion etching according to the patterned structure.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, this method has the potential to investigate gas diffusion properties under PEMFC operating conditions. 57 Parallel channels were created on a Si chip using microfabrication techniques, and air and nitrogen were supplied to the two parallel channels in the device. Oxygen was transported to a nitrogen flow channel through the CL under a rib between the two channels.…”

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confidence: 99%

Investigation of Gas Transport Properties of PEMFC Catalyst Layers Using a Microfluidic Device

Suzuki

Nakata

Tsutsui

et al. 2020

J. Electrochem. Soc.

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The effective gas diffusivity, porous structure, and tortuosity factor of catalyst layers used in proton exchange membrane fuel cells were evaluated using a microfluidic device. Sufficient gas transport properties of the catalyst layers are a key factor for achieving high-performance catalyst layers and fuel cells. In the present study, catalyst layers with different thicknesses and different carbon supports were evaluated. Stand-alone carbon black and multi-walled carbon nanotubes were blended into the catalyst layers as the support. The all-carbon-black-based catalyst layer contained some volume of isolated pores and some amount of microcracks, which depended on its thickness. The tortuosity factor was evaluated considering the effects of the isolated pores and microcracks. However, the tortuosity factor of the all-carbon-black-based catalyst layer was larger than the well-known Bruggeman-correlated tortuosity factor. When carbon nanotubes were blended into the catalyst layer, the tortuosity factor was drastically decreased to less than one-half that of the carbon-black-based catalyst layers. A change in the number of straight pores formed by the fibrous support and variation of the ionomer distribution can affect the tortuosity factor.

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Composition and evaluation of single-layer electrode proton exchange membrane fuel cells for mass transfer analysis

Cited by 4 publications

References 22 publications

Simultaneous in situ measurements and numerical analysis of mass transfer in polymer electrolyte fuel cell electrode slurries during drying

Simultaneous in situ measurements and numerical analysis of mass transfer in polymer electrolyte fuel cell electrode slurries during drying

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

Investigation of Gas Transport Properties of PEMFC Catalyst Layers Using a Microfluidic Device

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