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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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AvCarb MGL190
AvCarb® MGL190 is a superior carbon paper for fuel cell and electrolyzer applications. MGL190 dem..
From $14.00
Based on 3 reviews.

AvCarb MGL280
AvCarb® MGL280 is a superior carbon paper for fuel cell and electrolyzer applications. MGL280 dem..
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AvCarb MGL370
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Panex 30 Carbon Fiber Fabric
ZOLTEK™ Panex 30 woven carbon fiber fabric has high cross-ply tensile and interlaminar shear stre..
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Plain Carbon Cloth - 1071 HCB
AvCarb 1071 HCB plain carbon cloth fabric is designed to meet the demanding requirements of frict..
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AvCarb G100 Soft Graphite Battery Felt
G100 and G200 are the most popular graphite felts used due to their higher purity. They are also ..
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AvCarb G200 Soft Graphite Battery Felt
G100 and G200 are the most popular graphite felts used due to their higher purity. They are also ..
From $19.00

AvCarb C100 Soft Carbon Battery Felt
AvCarb C100 PAN-based soft carbon felt is an effective insulating material for application temper..
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AvCarb C200 Soft Carbon Battery Felt
AvCarb C200 PAN-based soft carbon felt is an effective insulating material for application temper..
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Sigracet 29 AA
Sigracet 29 AA is a non-woven carbon paper gas diffusion media that has no PTFE treatment.  ..
From $12.00
Based on 2 reviews.

Sigracet 25 BC
Sigracet 25 BC is a non-woven carbon paper with a Microporous Layer (MPL) that has been PTFE trea..
From $22.00

Sigracet 29 BC
Sigracet 29 BC is a non-woven carbon paper with a Microporous Layer (MPL) that has been PTFE trea..
From $14.00
Based on 3 reviews.

Sigracet 39 AA
Sigracet 39 AA is a non-woven carbon paper gas diffusion media that has no PTFE treatment.  ..
From $12.00

Sigracet 35 BC
Sigracet 35 BC is a non-woven carbon paper with a Microporous Layer (MPL) that has been PTFE trea..
From $25.00

Sigracet 39 BC
Sigracet 39BC is a non-woven carbon paper gas diffusion media with a Microporous Layer (MPL) that..
From $16.00