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Nafion - Sulfonic Membranes
Membranes for a Wide Variety of Electrochemical Applications; Nafion™ perfluorosulfonic acid (PFSA) membranes are based on a PFSA/polytetrafluoroethylene (PTFE) copolymer. Widely used in electrochemical cells, they function as cation-conducting solid electrolytes. Nafion™ membranes come in a variety of grades and embody different properties, allowing designers and engineers to match membranes to their specific application needs.
Nafion™ PFSA membranes have unique characteristics and can be used in a variety of applications. (See table below.)
Solution Cast Membranes: Table 1
Nafion™ solution cast membranes are prepared from Nafion™ dispersions. They generally are thinner than extrusion cast membranes for use in applications where low ion transport resistance is critical. Dispersion cast membranes are designed for durability in their intended applications.
Table 1: Nafion™ Solution Cast Membranes
|
Grade |
Description |
Chemically Stabilized |
Common Use(s) |
|
NR211 |
25-micron thickness |
Yes |
Energy storage, fuel cells |
|
NR212 |
50-micron thickness |
Yes |
Energy storage, fuel cells |
Extrusion Cast Membranes: Table 2
Nafion™ extrusion cast membranes, used in applications where high strength or low permeability/crossover is required, are generally thicker than solution cast membranes. They also can be further reinforced for maximum strength and tear resistance.
Table 2: Nafion™ Extrusion Cast Membranes
|
Grade |
Description |
Chemically Stabilized |
Common Use(s) |
|
Unreinforced membranes |
|||
|
N115 |
127-micron thickness |
Yes |
Energy storage, hydrogen generation, various electrolytic processes |
|
N117 |
183-micron thickness |
Yes |
Energy storage, hydrogen generation, various electrolytic processes |
|
N1110 |
254-micron thickness |
Yes |
Hydrogen generation, various electrolytic processes |
|
Reinforced membranes for specialty applications |
|||
|
N324 |
High strength, high anion rejection membrane |
No |
Various electrolytic processes |
|
N424 |
High strength membrane |
No |
Various electrolytic processes |
|
N438 |
Highest strength, flatter profile than N424 membrane
|
Yes |
Chlorine from hydrochloric acid using oxygen-depleted cathode (ODC) technology, various electrolytic processes |
|
N551 |
High strength membrane with gas-release coatings |
No |
Chlor-alkali for potassium service, various electrolytic processes |