Nafion (N117, N115, N212, N211, NC700) Cation-Exchange Membrane for Flow Battery, Electrolyzer and Fuel Cell, CFBEFCCEMN
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Nafion™ is the "gold standard" material for all three technologies due to its perfluorosulfonic acid (PFSA) chemistry, which offers unmatched chemical stability and proton conductivity. However, the specific grade and thickness used vary significantly based on the operating pressures and crossover requirements of each system.
In redox flow battery applications, thick Nafion 117 and 115 are used to create a long, difficult path for bulky vanadium or organic ions to travel through.
In electrolyzer applications, thicker membranes like Nafion 117 are standard because they provide the mechanical strength to withstand these pressure differences without rupturing. A thick membrane is a better barrier against gas crossover, ensuring that the hydrogen produced is high-purity (>99.9%) and doesn't create an explosive mixture with oxygen.
In the fuel cell application field, thinner membranes like Nafion 212 (50 um) or 211 (25 um) have much lower resistance, allowing for higher current densities. Thin membranes allow water to move back and forth more easily ("back-diffusion"), which helps keep the membrane from drying out during high-power operation.
| N117 | N115 | N212 | N211 | NC700 | |
| Thickness (um) | 183 | 127 | 51 | 25 | 15 |
| Density (g/cm2) | 360 | 250 | 100 | 50 | 30 |
| Ion Conductivity (S/cm) | - | - | 0.083 | - | - |
| Tensile Strength (MPa), MD | 43 | 43 | 32 | 23 | 45 |
| Tensile Strength (MPa), TD | 32 | 32 | 32 | 28 | 45 |
| Water Content (%) | - | - | 5 | - | - |
| Water Absorption (%) | 38 | 38 | 50 | 50 | 50 |
| Reinforce | No | No | No | No | PTFE |
| Package Grade | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack | 10cm * 10cm/pcs/pack |
Use Note:
(1) Application field for the above Nafion membrane products:
- N117: Vanadium redox flow battery, electrolyzer, and DMFC
- N115: Vanadium redox flow battery, water electrolyzer, fuel cell
- N212: PEM electrolyzer and water treatment under a medium-pressure system
- N211: Light electrolyzer and high-power fuel cell system
- NC700: High-power electrolyzer and fuel cell stack.
(2) N212, N211, and NC700 have two protective layers that should be removed before use, and no extra pretreatment is needed.
(3) M115 and N117 can be pretreated: 5% H2O2 solution (1h), DI water rinse (0.5h), 5 wt% dilute H2SO4 at 80 °C (1h), DI water rinse (0.5h).