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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 EP40
AvCarb EP40 Gas Diffusion substrates are unparalleled in their ability to meet the rigorous deman..
From $29.00
Based on 1 reviews.

AvCarb EP40T
AvCarb EP40T Gas Diffusion substrates are unparalleled in their ability to meet the rigorous dema..
From $44.00

AvCarb P50
AvCarb P50 Gas Diffusion substrates are unparalleled in their ability to meet the rigorous demand..
From $29.00
Based on 1 reviews.

AvCarb P50T - Wet Proofed
In combination with Ballard Power Systems' leadership and expertise in the development and manufa..
From $45.00

AvCarb P75
AvCarb P75 Gas Diffusion substrates are unparalleled in their ability to meet the rigorous demand..
From $29.00
Based on 1 reviews.

AvCarb P75T - Wet Proof
In combination with Ballard Power Systems' leadership and expertise in the development and manufa..
From $47.00
Based on 1 reviews.

AvCarb GDS1120
AvCarb Material Solution’s Gas Diffusion System GDS1120 P50 combines AvCarb's proprietary carbon ..
From $30.00
Based on 1 reviews.

AvCarb MB30
AvCarb Material Solution’s Gas Diffusion System MB30 combines AvCarb's proprietary carbon fiber p..
$30.00

AvCarb GDS2120
AvCarb Material Solution’s Gas Diffusion System GDS2120 P75 combines AvCarb's proprietary carbon ..
From $30.00

AvCarb GDS2230
AvCarb Material Solution’s Gas Diffusion System GDS2230 P75 combines AvCarb's proprietary carbon ..
From $30.00

AvCarb GDS2240
AvCarb Material Solution’s Gas Diffusion System GDS2240 combines AvCarb's proprietary carbon fibe..
From $30.00

AvCarb GDS3215
AvCarb Material Solution’s Gas Diffusion System GDS3215 EP40 combines AvCarb's proprietary carbon..
From $30.00

AvCarb GDS3250
AvCarb Material Solution’s Gas Diffusion System GDS3250 EP40 combines AvCarb's proprietary carbon..
From $30.00
Based on 1 reviews.

AvCarb GDS3260
AvCarb Material Solution’s Gas Diffusion System GDS3260 EP40 combines AvCarb's proprietary carbon..
From $30.00

AvCarb GDS22100
AvCarb Material Solution’s Gas Diffusion System GDS22100 combines AvCarb's proprietary carbon fib..
From $30.00