An overview is focused on the development of proton exchange membrane for fuel cells.The structure character and performance of the polyperfluorosulfonic acid membrane
as well as the method on modifying Nafion membrane and the development of new proton exchange membranes are introduced.The structures
preparation
properties of the various types of PEM and their applications in PEMFC or DMFC are also discussed in detail.The potential development in the membrane is also discussed in the end of the article.