Membranes

In order for a PEM fuel cell to operate, a Proton Exchange Membrane is needed that will carry the hydrogen ions, proton, from the anode to the cathode without passing the electrons that were removed from the hydrogen atoms. These polymer membranes that conduct proton through the membrane but are reasonably impermeable to the gases, serve as solid electrolytes (vs. liquid electrolyte) for variety of electrochemical applications, and are commonly known as Proton Exchange Membrane and/or Polymer Electrolyte Membranes (PEM). These membranes have been identified as one of the key components for various consumer related applications for fuel cells, e.g. automobiles, back-up power, portable power etc. Due to its application for many consumer markets, the technology keeps on evolving to make these membranes suitable for longer duration, and even high temperature operations.

For PEM fuel cell and electrolyzer applications, a polymer electrolyte membrane is sandwiched between an anode electrode and a cathode electrode. During electrochemical reaction, oxidation reaction at the anode generates protons and electrons; reduction reaction at the cathode combines protons and electrons with oxidants to generate water. To complete the electrochemical reaction, the proton exchange membrane plays a critical role that conducts protons from anode to cathode through the membrane. The proton exchange membrane also performs as a separator for separating anode and cathode reactants in fuel cells and electrolyzers.

Main Types of Fuel Cell Ion Exchange Membranes

 • Cation Exchange Membrane (CEM)
 • Anion Exchange Membrane (AEM)
 • Bipolar Membranes
 • Chlor-alkali Production Membranes

Whats is the Difference Between Cation and Anion Exchange Membranes?
Cation Exchange Membranes (CEM) are usually comprised of a fluorinated polymer with sulfonic acid sites and have excellent ionic conductivity and thermal/chemical durability. Currently manufactured Anion Exchange Membranes (AEMs) can utilize various alkaline stable polymeric materials as the host material and come with various functional sites that conducts OH- or any other anionic species.  Thermal/chemical durability of AEMs are in general lower compared to its CEM counterparts.


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Fumasep FAS-PET-75

Fumasep FAS-PET-75

Fumasep FAS-PET-75 is a PET reinforced Anion Exchange Membrane (AEM) with low resistance, high selec..

$27.00

Nafion™ Tubing

Nafion™ Tubing

Nafion™ tubing is a highly selective, semi-permeable membrane to water vapor. If gases inside Nafion..

$401.00

Fumasep FAS-PET-130

Fumasep FAS-PET-130

Fumasep FAS-PET-130 is a PET (Polyester) reinforced Anion Exchange Membrane (AEM) with low resistanc..

$29.00

Fumasep FKS-PET-130

Fumasep FKS-PET-130

Fumasep FKS-PET-130 is a PET reinforced Cation Exchange Membrane (CEM) with low resistance, high sel..

$30.00

Fumasep FAB-PK-130

Fumasep FAB-PK-130

Fumasep FAB-PK-130 is a PK reinforced Anion Exchange Membrane (AEM) with high proton blocking capabi..

$31.00

Fumasep FKB-PK-130

Fumasep FKB-PK-130

Lead times of 4 weeks are to be expected for this product. Please contact us for more accurate lead ..

$31.00

Fumasep FKL-PK-130

Fumasep FKL-PK-130

Fumasep FKL-PK-130 is a PK reinforced Cation Exchange Membrane (CEM) with high hydroxyl blocking cap..

$32.00

Fumasep FBM - Bipolar Membrane

Fumasep FBM - Bipolar Membrane

Fumasep FBM Bipolar Exchange Membrane with PK reinforcement consists of an anion exchange layer and ..

$313.00

Fumasep FKS-30

Fumasep FKS-30

Fumasep FKS-30 is a non-reinforced Cation Exchange Membrane (CEM) with very low resistance, high sel..

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Fumasep FAS-30

Fumasep FAS-30

Fumasep FAS-30 is a non-reinforced Anion Exchange Membrane (AEM) with very low resistance, high sele..

$25.00

Fumasep FKS-50

Fumasep FKS-50

Please note that this material is out of stock and not expected to arrive until December 2024. F..

$26.00

Fumasep FAS-50

Fumasep FAS-50

Fumasep FAS-50 is a non-reinforced Anion Exchange Membrane (AEM) with very low resistance, high sele..

$27.00

Porex PM21M

Porex PM21M

Porex is a micro-expanded PTFE product that allows gasses to permeate but has a high barrier for liq..

$20.00

Fumasep FAD-PET-75

Fumasep FAD-PET-75

Fumasep FAD-PET-75 is a PET (Polyester) reinforced Anion Exchange Membrane (AEM) with low resistance..

$27.00

Fumasep FAD-55

Fumasep FAD-55

Fumasep FAD-55 is a non-reinforced Anion Exchange Membrane (AEM) with low resistance, high acid tran..

$25.00

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