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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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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.

Carbon Cloth with MPL - W1S1009
CeTech is a woven carbon cloth with a Microporous Layer (MPL). It has a total thickness of 410 um..
From $16.00
Based on 1 reviews.

Carbon Cloth without MPL - W0S1009
CeTech is a woven carbon cloth without a Microporous Layer (MPL). It has a total thickness of 330..
$129.00

Carbon Cloth Wet Proofed
Carbon Cloth- Graphitized Spun Yarn Carbon Fabrics WOVEN CARBON FABRICS are carbon fiber fabr..
From $17.00

CeTech GDS090
CeTech GDS090 is a carbon paper without a Microporous Layer (MPL). It has a total thickness of 90..
$148.00

CeTech GDS210
CeTech GDS210 is a carbon paper without a Microporous Layer (MPL). It has a total thickness of 21..
$148.00

CeTech GDS230
CeTech GDS230 is a carbon paper without a Microporous Layer (MPL). It has a total thickness of 23..
$148.00

CeTech GDS310
CeTech GDS310 is a carbon paper without a Microporous Layer (MPL). It has a total thickness of 31..
$148.00

CeTech N0S1005
CeTech N0S1005 is a carbon paper without a Microporous Layer (MPL). It has a total thickness of 1..
$148.00

CeTech GDL240
CeTech GDL240 is a carbon paper with a Microporous Layer (MPL). It has a total thickness of 240 u..
$175.00

CeTech GDL260
CeTech GDL260 is a carbon paper with a Microporous Layer (MPL). It has a total thickness of 260 u..
$175.00

CeTech GDL340
CeTech GDL340 is a carbon paper with a Microporous Layer (MPL). It has a total thickness of 340 u..
$175.00

CeTech N1S1007
CeTech N1S1007 is a carbon paper with a Microporous Layer (MPL). It has a total thickness of 210 ..
$175.00

CeTech GDL120
CeTech GDL120 is a carbon paper with a Microporous Layer (MPL). It has a total thickness of 120 u..
$175.00