Proton exchange membrane (PEM) is the core component of proton exchange membrane fuel cell (PEMFC). Its quality directly affects the service life of the battery. The proton exchange membrane is essentially a selective permeability membrane. Its principle is that the functional groups (sulfonate groups, etc.) on the membrane-forming material can easily combine with protons to form proton channels, allowing protons to pass through the membrane smoothly. .
The currently commercialized membrane material is perfluorosulfonic acid membrane. Although it has excellent chemical stability and good proton conductivity, However, its practical application is ineffective due to its high price and strong dependence on water and temperature. Due to the excellent properties of expanded polytetrafluoroethylene membrane, it becomes a good substitute for perfluorosulfonic acid membrane. Generally, there are two relatively simple and feasible methods: A. Surface deposition method: that is, using the PTFE membrane as the base and filling the holes with electrolyte; B. Radiation grafting method: under the action of ionizing radiation, several active points are generated on the surface of the PTFE membrane. Vinyl monomers or their homopolymers are then grafted onto these active sites.
In the field of fuel cells, expanded polytetrafluoroethylene membrane can be used as the supporting base membrane of MEA proton exchange membrane, which is very good The excellent mechanical properties and high porosity and uniform pore size ensure good performance of the fuel cell. At the same time, the thickness of the PTFE proton membrane is very thin, which allows it to obtain good operating performance by occupying only a small space.
Expanded polytetrafluoroethylene membrane technology has always been the core of business, in biopharmaceuticals, equipment, food and beverages, semiconductors It plays an indispensable role in many fields such as manufacturing and communications. Its pore-forming capacity ranges from 0.1μm to 1μm, providing functional solutions such as fine filtration, removal of small bacteria and viruses, hydrophobic breathability, and sound transmission. Interested parties can enter the store for consultation and purchase!
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