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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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Freudenberg H23C6
Freudenberg H23C6 a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Microp..
From $102.00

Freudenberg H23I6
Freudenberg H23I6 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $91.00

Freudenberg H23C8
Freudenberg H23C8 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $107.00

Freudenberg H23
Freudenberg H23 is a flexible and easy to use base carbon paper Gas Diffusion Layer (GDL) without..
From $80.00

Freudenberg H14
Freudenberg H14 is a flexible and easy to use base carbon paper Gas Diffusion Layer (GDL) without..
From $80.00

Freudenberg H15
Freudenberg H15 is a flexible and easy to use base carbon paper Gas Diffusion Layer (GDL) without..
From $80.00

Freudenberg H23C3
Freudenberg H23C3 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $115.00

Freudenberg H14C7
Freudenberg H14C7 is a flexible and easy to use carbon paper Gas Diffusion Layer (GDL) with a Mic..
From $115.00

Spectracarb 2050A-0550
Spectracarb™ 2050A-0550 Gas Diffusion Layer (GDL) is a heavy duty porous “graphitized” resin bond..
From $13.50
Based on 3 reviews.

Spectracarb 2050A-0850
Spectracarb™ 2050A-0850 Gas Diffusion Layer (GDL) is a heavy duty porous “graphitized” resin bond..
From $13.50

Spectracarb 2050A-1050
Spectracarb™ 2050A-1050 Gas Diffusion Layer (GDL) is a standard grade carbon paper GDL that is ve..
From $14.00

Spectracarb 2050L-0850
Spectracarb™ 2050L-0850 Gas Diffusion Layer (GDL) is a heavy duty porous “graphitized” resin bond..
From $13.50

Spectracarb 2050L-1050
Spectracarb™ 2050L-1050 Gas Diffusion Layer (GDL) is a standard grade carbon paper GDL that is ve..
From $14.00

Spectracarb 2050A-1535
Spectracarb™ 2050A-1535 Gas Diffusion Layer (GDL) is a heavy duty porous graphitized carbon sheet..
From $15.00
Based on 2 reviews.

Spectracarb 2050A-1550
Spectracarb™ 2050A-1550 Gas Diffusion Layer (GDL) is a heavy duty porous graphitized carbon sheet..
From $15.00
Based on 2 reviews.