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Gas Diffusion Layers

Gas Diffusion Layers (GDL) are key components in various types of fuel cells, including Proton Exchange Membrane (PEM), Direct Methanol (DMFC) and Phosphoric Acid (PAFC) stacks as well as in other electrochemical devices such as electrolyzers. In fuel cells, this thin, porous sheet must provide high electrical and thermal conductivity and chemical / corrosion resistance, in addition to controlling the proper flow of reactant gases (hydrogen and air) and managing the water transport out of the membrane electrode assembly (MEA). This layer must also have controlled compressibility to support the external forces from the assembly, and not deform into the bi-component plate channels to restrict flow. Other uses require different criteria, for example, electrolyzers require thicker, higher density porous plates, while humidifiers have most of the same requirements as fuel cell stacks, but the GDLs do not need to be electrically conductive. The GDL serves as a connection bridge between the MEA and graphite plate.

The main functions of GDL include the following:

• A gas diffused pathway from flow channels to the catalyst layer
• Help removes by-produced water outside of the catalyst layer and prevent flooding
• Keep some water on surface for conductivity through the membrane
• Heat transfer during cell operation
• Helps provide enough mechanical strength to hold the MEA from extension caused by water absorbency

What is the purpose of a Hydrophobic Treatment (AKA Wet Proofing)?

A hydrophobic treatment to GDL enables improved water transport. In PEM fuel cells, specifically water retention can result in lower power generation. These GDLs are treated with Teflon in order to make the material hydrophobic and improve water transport.

What is the purpose of a Micro-porous Layer (MPL)?

The purpose of the carbon Microporous Layer (MPL) is to minimize the contact resistance between the GDL and catalyst layer, limit the loss of catalyst to the GDL interior and help to improve water management as it provides effective water transport. MPL treatment is especially recommended for use with CCM (Catalyst Coated Membrane).

The Fuel Cell Store proudly carries the largest selection of carbon based Gas Diffusion Layers (GDL) in the world!  If you know of a Gas Diffusion Layer we do not carry please contact us and let us know!

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Toray Carbon Paper 030, Wet Proofed
Toray Paper 030 - TGP-H-030 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $10.00
Based on 7 reviews.

Toray Carbon Paper 060, Wet Proofed
Toray Paper 060 - TGP-H-060 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $10.00
Based on 3 reviews.

Toray Carbon Paper 090, Wet Proofed
Toray Paper 090 - TGP-H-090 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $10.00
Based on 2 reviews.

Toray Carbon Paper 120, Wet Proofed
Toray Paper 120 - TGP-H-120 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $10.00
Based on 2 reviews.

Toray Carbon Paper 060 Value Pack, Wet Proofed
Toray Paper 060 - TGP-H-060 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $88.00

Toray Carbon Paper 090 Value Pack, Wet Proofed
Toray Paper 090 - TGP-H-090 - is a carbon fiber composite paper suitable for use as a catalyst ba..
From $88.00

Toray Carbon Paper 060 with Micro Porous Layer
Toray Paper 060 - TGP-H-060 - is a carbon fiber composite paper suitable for use as a catalyst ba..
$579.00

ELAT - Hydrophilic Plain Cloth
ELAT Hydrophilic Plain Carbon Cloth gas diffusion layers are excellent for flow batteries. The ex..
From $23.00

ELAT LT1400
FuelCellsEtc's ELAT® LT1400 is a carbon cloth Gas Diffusion Layer (GDL) with a carbon microporous..
From $18.00

ELAT LT2400
FuelCellsEtc's ELAT® LT2400W is a carbon cloth gas diffusion layer (GDL) with a carbon microporou..
From $23.00

Freudenberg H14C9
Freudenberg H14C9 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $102.00

Freudenberg H23C2
Freudenberg H23C2 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $102.00

Freudenberg H23C4
Freudenberg H23C4 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $102.00

Freudenberg H24C5
Freudenberg H24C5 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $102.00

Freudenberg H24C3
Freudenberg H24C3 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $102.00