Proton Exchange Membrane (PEM) is the core component of Proton Exchange Membrane Fuel Cell (PEMFC), which plays a crucial role in battery performance. It not only has a blocking effect, but also has the function of conducting protons. The full proton exchange membrane mainly uses fluorosulfonic acid type proton exchange membranes; Nafion recast film; Non fluoropolymer proton exchange membrane; New composite proton exchange membranes, etc. Proton exchange membrane fuel cells have become the most competitive clean alternative power source for gasoline internal combustion engines. Materials used as PEM should meet the following conditions: (1) good proton conductivity; (2) The electroosmotic effect of water molecules in the membrane is small; (3) The permeability of gas in the membrane should be minimized as much as possible; (4) Good electrochemical stability; (5) Good dry to wet conversion performance; (6) Having a certain mechanical strength; (7) Good processability and appropriate price. At present, it is divided into: perfluorosulfonic acid type proton exchange membranes; Nafion recast film; Non fluoropolymer proton exchange membrane; New composite proton exchange membranes, etc
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