Novel hydrophilic and hydrophobic double microporous layer coated gas diffusion layer to enhance performance of polymer electrolyte fuel cells under both low and high humidity

Tatsumi Kitahara, Hironori Nakajima, Masaoki Inamoto, Masashi Morishita

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47 Citations (Scopus)

Abstract

A novel hydrophilic and hydrophobic double microporous layer (MPL) coated gas diffusion layers (GDL) was developed to enhance the performance of polymer electrolyte fuel cells (PEFCs) under both low and high humidity. A thin hydrophilic layer using titanium dioxide (TiO2) coated on the hydrophobic MPL is effective at conserving the humidity of the membrane electrode assembly (MEA) under low humidity, while a hydrophobic intermediate MPL between the hydrophilic layer and the carbon paper substrate prevents the removal of water from the hydrophilic layer. This results in a significant enhancement of PEFC performance under low humidity over that for a conventional hydrophobic MPL coated GDL. The double MPL coated GDL is also effective at increasing the discharge of excess water from the catalyst layer, which reduces flooding and achieves further enhancement of the PEFC performance under high humidity, compared with that for a conventional hydrophobic MPL coated GDL. The appropriate pore diameter and hydrophobicity, and decrease in the thickness of the hydrophobic intermediate MPL in the double MPL, are essential to enhance the PEFC performance.

Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalJournal of Power Sources
Volume234
DOIs
Publication statusPublished - Mar 11 2013

Fingerprint

gaseous diffusion
Diffusion in gases
Electrolytes
fuel cells
humidity
Fuel cells
Atmospheric humidity
Polymers
electrolytes
polymers
Water
Hydrophobicity
Titanium dioxide
Carbon
Membranes
Electrodes
Catalysts
Substrates
augmentation
hydrophobicity

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "A novel hydrophilic and hydrophobic double microporous layer (MPL) coated gas diffusion layers (GDL) was developed to enhance the performance of polymer electrolyte fuel cells (PEFCs) under both low and high humidity. A thin hydrophilic layer using titanium dioxide (TiO2) coated on the hydrophobic MPL is effective at conserving the humidity of the membrane electrode assembly (MEA) under low humidity, while a hydrophobic intermediate MPL between the hydrophilic layer and the carbon paper substrate prevents the removal of water from the hydrophilic layer. This results in a significant enhancement of PEFC performance under low humidity over that for a conventional hydrophobic MPL coated GDL. The double MPL coated GDL is also effective at increasing the discharge of excess water from the catalyst layer, which reduces flooding and achieves further enhancement of the PEFC performance under high humidity, compared with that for a conventional hydrophobic MPL coated GDL. The appropriate pore diameter and hydrophobicity, and decrease in the thickness of the hydrophobic intermediate MPL in the double MPL, are essential to enhance the PEFC performance.",
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AU - Nakajima, Hironori

AU - Inamoto, Masaoki

AU - Morishita, Masashi

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N2 - A novel hydrophilic and hydrophobic double microporous layer (MPL) coated gas diffusion layers (GDL) was developed to enhance the performance of polymer electrolyte fuel cells (PEFCs) under both low and high humidity. A thin hydrophilic layer using titanium dioxide (TiO2) coated on the hydrophobic MPL is effective at conserving the humidity of the membrane electrode assembly (MEA) under low humidity, while a hydrophobic intermediate MPL between the hydrophilic layer and the carbon paper substrate prevents the removal of water from the hydrophilic layer. This results in a significant enhancement of PEFC performance under low humidity over that for a conventional hydrophobic MPL coated GDL. The double MPL coated GDL is also effective at increasing the discharge of excess water from the catalyst layer, which reduces flooding and achieves further enhancement of the PEFC performance under high humidity, compared with that for a conventional hydrophobic MPL coated GDL. The appropriate pore diameter and hydrophobicity, and decrease in the thickness of the hydrophobic intermediate MPL in the double MPL, are essential to enhance the PEFC performance.

AB - A novel hydrophilic and hydrophobic double microporous layer (MPL) coated gas diffusion layers (GDL) was developed to enhance the performance of polymer electrolyte fuel cells (PEFCs) under both low and high humidity. A thin hydrophilic layer using titanium dioxide (TiO2) coated on the hydrophobic MPL is effective at conserving the humidity of the membrane electrode assembly (MEA) under low humidity, while a hydrophobic intermediate MPL between the hydrophilic layer and the carbon paper substrate prevents the removal of water from the hydrophilic layer. This results in a significant enhancement of PEFC performance under low humidity over that for a conventional hydrophobic MPL coated GDL. The double MPL coated GDL is also effective at increasing the discharge of excess water from the catalyst layer, which reduces flooding and achieves further enhancement of the PEFC performance under high humidity, compared with that for a conventional hydrophobic MPL coated GDL. The appropriate pore diameter and hydrophobicity, and decrease in the thickness of the hydrophobic intermediate MPL in the double MPL, are essential to enhance the PEFC performance.

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