A good PEM should exhibit several key properties: 1. High Proton Conductivity: To efficiently transport protons from the anode to the cathode. 2. Low Electronic Conductivity: To prevent current leakage. 3. Chemical Stability: To withstand the harsh oxidative and reductive environments in fuel cells. 4. Mechanical Strength: To maintain structural integrity under varying pressure and temperature. 5. Low Gas Permeability: To prevent mixing of hydrogen and oxygen gases.
