Basic Information
| Introduction |
The proton exchange membrane (PEM) is a core component of fuel cells, playing a crucial role in their performance and lifespan. Its structure and principle are as follows: It is a composite membrane based on expanded polytetrafluoroethylene (ePTFE) coated with perfluorosulfonic acid resin; it has a three-layer structure: the middle layer is ePTFE, and the top and bottom layers are sulfonic acid resin. In the membrane, sulfonic acid groups absorb moisture, and H+ ions combine with water molecules, hopping from one fixed sulfonic acid group site to another as hydrated protons (H3O+) for proton conduction. |
| Structural Composition |
ePTFE intermediate layer + sulfonic acid resin composite three-layer structure |
| Thickness |
10 ± 1 µm |
| Apparent Density |
21 ± 2 g/cm³ |
| Swelling Rate (100 °C 10 min) |
≤ 5.0 % |
| Tensile Strength |
≥ 60 MPa (MD); ≥ 80 MPa (TD) |
| Elastic Modulus |
≥ 400 MPa (MD); ≥ 600 MPa (TD) |
| Proton Conductivity |
≥ 110 mS/cm (25 °C water bath) |
| Ion Exchange Equivalent |
1000-1200 g/mol |
Applications
| Application |
Conducting protons, isolating gases, and hindering electrons (core component of fuel cells) |
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