Hydrophilic and hydrophobic double MPL coated gas diffusion layer for enhanced PEFC performance under no-humidification at the cathode

Tatsumi Kitahara, Toshiaki Konomi, Hironori Nakajima, Junichiro Shiraishi

Research output: Contribution to journalArticle

Abstract

Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management property of polymer electrolyte fuel cells (PEFCs). In the present study, the influence of a hydrophilic and hydrophobic double MPL on PEFC performance under no-humidification at the cathode was evaluated. The hydrophobic MPL using a PTFE (polytetrafluoroethylene) binder and the hydrophilic MPL using a PVA (polyvinyl alcohol) binder were coated on the carbon paper GDL substrate. The thin hydrophilic layer coated on the conventional hydrophobic MPL enhances the ability to prevent drying-up of the MEA, thereby enhancing PEFC performance. The hydrophilic layer is effective for conserving membrane humidity. The hydrophobic intermediate layer between the hydrophilic layer and the GDL substrate prevents removing the water in the hydrophilic layer via dry air in the substrate. Reducing the hydrophilic layer thickness to 5 μm is effective for enhancing PEFC performance. Appropriate enhancement of hydrophilicity by increasing the PVA content to 5 mass% is also effective for enhancing PEFC performance.

Original languageEnglish
Pages (from-to)2218-2226
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume76
Issue number772
DOIs
Publication statusPublished - Dec 2010

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gaseous diffusion
Diffusion in gases
fuel cells
Fuel cells
Cathodes
cathodes
Electrolytes
electrolytes
polymers
Polymers
Polyvinyl alcohols
Binders
Substrates
Water management
Hydrophilicity
Polytetrafluoroethylenes
Atmospheric humidity
Drying
polyvinyl alcohol
Membranes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Hydrophilic and hydrophobic double MPL coated gas diffusion layer for enhanced PEFC performance under no-humidification at the cathode",
abstract = "Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management property of polymer electrolyte fuel cells (PEFCs). In the present study, the influence of a hydrophilic and hydrophobic double MPL on PEFC performance under no-humidification at the cathode was evaluated. The hydrophobic MPL using a PTFE (polytetrafluoroethylene) binder and the hydrophilic MPL using a PVA (polyvinyl alcohol) binder were coated on the carbon paper GDL substrate. The thin hydrophilic layer coated on the conventional hydrophobic MPL enhances the ability to prevent drying-up of the MEA, thereby enhancing PEFC performance. The hydrophilic layer is effective for conserving membrane humidity. The hydrophobic intermediate layer between the hydrophilic layer and the GDL substrate prevents removing the water in the hydrophilic layer via dry air in the substrate. Reducing the hydrophilic layer thickness to 5 μm is effective for enhancing PEFC performance. Appropriate enhancement of hydrophilicity by increasing the PVA content to 5 mass{\%} is also effective for enhancing PEFC performance.",
author = "Tatsumi Kitahara and Toshiaki Konomi and Hironori Nakajima and Junichiro Shiraishi",
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AU - Kitahara, Tatsumi

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AU - Nakajima, Hironori

AU - Shiraishi, Junichiro

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N2 - Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management property of polymer electrolyte fuel cells (PEFCs). In the present study, the influence of a hydrophilic and hydrophobic double MPL on PEFC performance under no-humidification at the cathode was evaluated. The hydrophobic MPL using a PTFE (polytetrafluoroethylene) binder and the hydrophilic MPL using a PVA (polyvinyl alcohol) binder were coated on the carbon paper GDL substrate. The thin hydrophilic layer coated on the conventional hydrophobic MPL enhances the ability to prevent drying-up of the MEA, thereby enhancing PEFC performance. The hydrophilic layer is effective for conserving membrane humidity. The hydrophobic intermediate layer between the hydrophilic layer and the GDL substrate prevents removing the water in the hydrophilic layer via dry air in the substrate. Reducing the hydrophilic layer thickness to 5 μm is effective for enhancing PEFC performance. Appropriate enhancement of hydrophilicity by increasing the PVA content to 5 mass% is also effective for enhancing PEFC performance.

AB - Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management property of polymer electrolyte fuel cells (PEFCs). In the present study, the influence of a hydrophilic and hydrophobic double MPL on PEFC performance under no-humidification at the cathode was evaluated. The hydrophobic MPL using a PTFE (polytetrafluoroethylene) binder and the hydrophilic MPL using a PVA (polyvinyl alcohol) binder were coated on the carbon paper GDL substrate. The thin hydrophilic layer coated on the conventional hydrophobic MPL enhances the ability to prevent drying-up of the MEA, thereby enhancing PEFC performance. The hydrophilic layer is effective for conserving membrane humidity. The hydrophobic intermediate layer between the hydrophilic layer and the GDL substrate prevents removing the water in the hydrophilic layer via dry air in the substrate. Reducing the hydrophilic layer thickness to 5 μm is effective for enhancing PEFC performance. Appropriate enhancement of hydrophilicity by increasing the PVA content to 5 mass% is also effective for enhancing PEFC performance.

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