Microporous layer-coated gas diffusion layer for performance enhancement of polymer electrolyte fuel cells without humidification using anode gas recirculation

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Abstract

The present study examined the effect of anode gas recirculation on the performance of a polymer electrolyte fuel cell (PEFC) without humidification. Increasing the gas flow velocity to 2 m s-1 by increasing the anode gas recirculation promotes water transport from the anode gas to the membrane. Decreasing the pore diameter of a microporous layer (MPL)-coated gas diffusion layer (GDL) is effective at preventing membrane dehydration, which enhances PEFC performance without humidification. The oxygen transport resistances are measured using the limiting current density values. Decreasing the MPL pore diameter raises the water breakthrough pressure, increasing the oxygen transport resistance under high humidity conditions. When employing an MPL containing hydrophilic carbon nanotubes, it is possible to decrease the pore diameter without raising the water breakthrough pressure. This is therefore an effective means of reducing the oxygen transport resistance under high humidity conditions, compared with that obtained when using a hydrophobic MPL.

Original languageEnglish
Pages (from-to)F1366-F1372
JournalJournal of the Electrochemical Society
Volume163
Issue number13
DOIs
Publication statusPublished - 2016

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gaseous diffusion
Diffusion in gases
Electrolytes
fuel cells
Fuel cells
Anodes
Polymers
anodes
Gases
electrolytes
Oxygen
Water
augmentation
Atmospheric humidity
polymers
gases
water pressure
Membranes
Carbon Nanotubes
porosity

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

Cite this

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abstract = "The present study examined the effect of anode gas recirculation on the performance of a polymer electrolyte fuel cell (PEFC) without humidification. Increasing the gas flow velocity to 2 m s-1 by increasing the anode gas recirculation promotes water transport from the anode gas to the membrane. Decreasing the pore diameter of a microporous layer (MPL)-coated gas diffusion layer (GDL) is effective at preventing membrane dehydration, which enhances PEFC performance without humidification. The oxygen transport resistances are measured using the limiting current density values. Decreasing the MPL pore diameter raises the water breakthrough pressure, increasing the oxygen transport resistance under high humidity conditions. When employing an MPL containing hydrophilic carbon nanotubes, it is possible to decrease the pore diameter without raising the water breakthrough pressure. This is therefore an effective means of reducing the oxygen transport resistance under high humidity conditions, compared with that obtained when using a hydrophobic MPL.",
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AU - Kitahara, Tatsumi

AU - Nakajima, Hironori

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N2 - The present study examined the effect of anode gas recirculation on the performance of a polymer electrolyte fuel cell (PEFC) without humidification. Increasing the gas flow velocity to 2 m s-1 by increasing the anode gas recirculation promotes water transport from the anode gas to the membrane. Decreasing the pore diameter of a microporous layer (MPL)-coated gas diffusion layer (GDL) is effective at preventing membrane dehydration, which enhances PEFC performance without humidification. The oxygen transport resistances are measured using the limiting current density values. Decreasing the MPL pore diameter raises the water breakthrough pressure, increasing the oxygen transport resistance under high humidity conditions. When employing an MPL containing hydrophilic carbon nanotubes, it is possible to decrease the pore diameter without raising the water breakthrough pressure. This is therefore an effective means of reducing the oxygen transport resistance under high humidity conditions, compared with that obtained when using a hydrophobic MPL.

AB - The present study examined the effect of anode gas recirculation on the performance of a polymer electrolyte fuel cell (PEFC) without humidification. Increasing the gas flow velocity to 2 m s-1 by increasing the anode gas recirculation promotes water transport from the anode gas to the membrane. Decreasing the pore diameter of a microporous layer (MPL)-coated gas diffusion layer (GDL) is effective at preventing membrane dehydration, which enhances PEFC performance without humidification. The oxygen transport resistances are measured using the limiting current density values. Decreasing the MPL pore diameter raises the water breakthrough pressure, increasing the oxygen transport resistance under high humidity conditions. When employing an MPL containing hydrophilic carbon nanotubes, it is possible to decrease the pore diameter without raising the water breakthrough pressure. This is therefore an effective means of reducing the oxygen transport resistance under high humidity conditions, compared with that obtained when using a hydrophobic MPL.

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