What conditions should a proton exchange membrane meet?
The proton exchange membrane is a selectively permeable membrane, which has the dual function of proton channel and hindering the direct reaction of reactants. Accordingly, we should consider the following points when choosing a proton exchange membrane:
①High conductivity of protons to reduce ohmic resistance and improve battery output power;
② When DMFC works, keep the membrane structure and resin composition unchanged, so as to maintain excellent chemical and electrochemical stability, and maintain the reliability and durability of the battery;
③The membrane should have low reactant permeability coefficients under both dry and wet conditions to reduce the mixing potential and improve the cell Faradaic efficiency;
④The surface of the membrane before the decomposition of the membrane resin has a certain viscosity to ensure the good combination of the catalytic layer and the membrane and reduce the contact resistance;
⑤The membrane has a certain mechanical strength in the dry and wet state to ensure the preparation and assembly of the membrane electrode assembly;
⑥Considering industrialization conditions, membrane material selection should be easy to obtain and low cost.