Anion-Exchange Membrane (Fumasep, FAAM Series) for Alkaline Electrolyzer and Fuel Cell, CAEFCAEMFAAM
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The Fumasep FAAM series represents the next generation of anion exchange membranes (AEMs) from Fumatech BWT. While the older FAA-3 series is the traditional "workhorse," the FAAM series is specifically optimized for AEM Water Electrolysis (AEMWE) and high-power Fuel Cells, utilizing a reinforced or ultra-thin architecture to compete with benchmark materials like PiperION.
FAAM-10 and FAAM-15 (The Performance Leaders): These are among the thinnest anion membranes on the market. In a fuel cell, the goal is to minimize the Area Specific Resistance (ASR). These grades allow for world-class current densities (>2 A/cm^2) by making the ion travel path as short as possible. However, they have a higher rate of gas crossover and are extremely difficult to handle without creating pinholes.
FAAM-20 and FAAM-40 (The Electrolysis Standards): These are the most common choices for "zero-gap" water electrolyzers. The FAAM-40 is highly recommended for electrolysis because the 40um thickness provides a sufficient physical barrier to keep Hydrogen and Oxygen gases separate, which is critical for system safety and gas purity. Conductivity: These membranes maintain high hydroxide (OH-) conductivity while offering better mechanical "body" than the ultra-thin 10 um films.
| Part Number |
CAEFCAEMFAAM10 |
CAEFCAEMFAAM15 |
CAEFCAEMFAAM20 |
CAEFCAEMFAAM40 |
| Membrane Name |
FAAM-10 |
FAAM-15 |
FAAM-20 |
FAAM-40 |
| Thickness (um) |
8-13 |
11-19 |
17-25 |
35-45 |
| Reinforcement |
None (Self-Supporting) |
None (Self-Supporting) |
None (Self-Supporting) |
None (Self-Supporting) |
| Backing Foil |
Yes (PET) |
Yes (PET) |
Yes (PET) |
None |
| Swelling (Hydration) |
40-60% (12 M aqueous KOH at 20 °C) |
40-60% (12 M aqueous KOH at 20 °C) |
40-60% (12 M aqueous KOH at 20 °C) |
40-60% (12 M aqueous KOH at 20 °C) |
| Tensile Strength (MPa) |
>100 |
>100 |
>100 |
>100 |
| Ion Exchange Capacity (IEC) |
1.8 – 2.1 meq/g |
1.8 – 2.1 meq/g |
1.8 – 2.1 meq/g |
1.8 – 2.1 meq/g |
| Key Characteristics |
Lowest possible resistance; very delicate. |
Standard for high-efficiency fuel cell stacks. |
Balanced thin-film for lab research. |
Best gas barrier for standard electrolysis. |
| Application Cases |
High-power AEMFC |
AEM Fuel Cells |
AEMFC / AEMWE |
AEM Water Electrolysis |
| Package Grade |
10cm * 10cm/pcs/pack |
10cm * 10cm/pcs/pack |
10cm * 10cm/pcs/pack |
10cm * 10cm/pcs/pack |
Use Note:
Proper preparation is the difference between a high-performing cell and a failed experiment.
(1) Peel the Backing Foil: These membranes are delivered on a clear PET backing foil. You must carefully peel the membrane away from this plastic before assembly.
(2) Ion Conversion: These FAAM membranes are typically shipped in the Bromide (Br-) or Chloride (Cl-) form. For electrolysis, it is supposed to soak them in 1.0 M KOH for 12–24 hours to convert them to the active Hydroxide (OH-) form.
(3) The Hydration Rule: Always soak the membrane for at least 24 hours before cutting to final size. If you cut it dry and then put it in a wet cell, it will swell, buckle, and likely leak or short-circuit.
References:
- Y. Song, et al., A Hybrid Redox-Mediated Zinc-Air Fuel Cell for Scalable and Sustained Power Generation, Angew. Chem. Int. Ed. 2024, 63, e202314796.
- J. Zhao, et al., Rationally designed Ru catalysts supported on TiN for highly efficient and stable hydrogen evolution in alkaline conditions, Nat. Commun., 2024, 14, 6391.