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Pention-AEM-72-05-5%Crosslinking

Product Code: 72600070

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The Xergy Pention-AEM-72-05 membrane is a composite AEM that uses the poly(norbornene) based resin and has an ion exchange capacity of 3.4 to 3.6 mequiv/g. Pention anion exchange membranes offer excellent mechanical strength and stability to a wide variety of chemistries. These particular AEMs depending on their thickness and crosslinking degree have demonstrated up to 9 A/cm2 current densities (or >3 W/cm2 power densities) in alkaline fuel cells with excellent durability and lifetime [based on the recent jointly conducted study between NREL, University of South Carolina, and Georgia Institute of Technology].  The stated electrochemical performance data is for reference only and depending on the MEA, CCM or GDE manufacturing method, used membrane thickness, testing hardware design and components used in the test hardware, and operational parameters (temperature, pressure, reactant flow rates, etc.), those values may or may not be attained. Xergy currently produces Composite Pention anion exchange membrane sheets in 5, 10, 20, and 30µm thicknesses and 5x5cm, 10x10cm, and 15x15cm sizes. Image on the right side shows the chemical composition of the anion exchange resin used to manufacture Xion Composite Pention membranes.

The Xion Composite Pention-AEM-72-05 is a 5 micrometers thick anion exchange membrane and it can be used in fuel cells, electrolyzers, electrodialysis, redox flow batteries, electrochemical compressors, and a wide variety of other devices. Composite Pention AEMs are currently offered with 5% or 15% crosslinking levels. 

XION Composite PENTION Membranes are ultra-thin, ultra-strong, and provide ultra-high performance while demonstrating highly stable performance as reinforced anion exchange membranes (AEM). The ionomer structure contains a poly(norbornene) backbone with quaternary ammonium functional groups. A reinforcement layer is integrated into the structure of the membrane to provide enhanced mechanical properties. The enhanced mechanical properties as free-standing membranes, providing higher ionic conductance without sacrificing strength. 

Benefits of Xion Composite Pention AEMs:

-High anionic conductivity
-Great chemical stability at low and high temperatures
-Ultra-thin membranes with excellent mechanical strength

Xion Composite Pention AEM Properties(*):
Crosslinking (%) Thickness (micrometers) IEC (meqv/g) OH- conductivity (mS/cm) at 80 ºC Water Uptake (%) Tensile Strength (MPa) at 50% RH and 50 ºC
5 10 3.4 - 3.6 170 - 180 90 - 100 40
15 10 3.4 - 3.6 125 - 135 60 - 70 50

*Properties of 10 micrometers thick membranes with different crosslinking % are provided in the table are for reference and example purposes only.

Pre-treatment protocol:

Composite Pention membranes are shipped in the bromide or chloride forms.  

For standard alkaline fuel cell / electrolysis applications, the membrane should be converted into OH-form by treating it with 0.5 – 1.0 M NaOH or KOH solution: Put the membrane sample in an aqueous solution of 0.5 – 1.0 M NaOH or KOH for at least 24 h at 20°C – 30°C. After rinsing with demineralised water (pH ~ 7) the membrane is ready to use. Use closed container to avoid CO2 contamination (carbonate formation that may affect conductivity). The membrane in OH-form must be stored under wet / humidified and CO2-free conditions, avoid drying out of the membrane in OH-form. Long-term storage in dry conditions should be preferably done in carbonate, Cl- or Br- form.

For other electrochemical (electrodialysis, desalination, electro-electrodialysis, reverse electrodialysis, acid recovery, salt splitting, etc.) and non-electrochemical applications, the membrane should be converted into the anionic form that is relevant for the intended application.  For example, if the application is requiring the Cl- anions to be transferred through the membrane, then this anion exchange membrane needs to be converted into the Cl- form.  In order to convert this membrane into Cl- form, it needs to be submerged into a 1-2 M salt solution of NaCl or KCl (dissolved in deionized water) for a period of 24-72 hours and then rinsed with deionized water to remove the excess salt from the membrane surface.  Or if the intended application is requiring to transfer sulfate anions, then this anion exchange membrane needs to be converted into the sulfate form prior to its assembly into the cell.  A neutral salt solution of Na2SO4 or K2SO4 would usually be sufficient to achieve the full conversion of membrane into the sulfate form after fully submerging the membrane into the salt solution for 24-72 hours at room temperature.  

If you have any concerns about storage, chemical stability, pre-treatment or before proceeding, please feel free to contact us for further information.

Lead time for this product is usually around 1 - 2 weeks to ship.

Membrane Properties
Thickness 5 μm
Tensile Strength - max. (MPa) 40 - 50 (measured at 50%RH, 50°C)
Water uptake (wt%) 60 - 100 (depending on the degree of crosslinking)
Crosslinking 5 or 15%
Ion Exchange Capacity 3.4 - 3.6 meq/g
Conductivity (mS/cm) 125 - 180 (OH- anion conductivity at 80 deg Celsius, depending on the degree of crosslinking)

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