Binders are crucial elements for the efficient functioning of fuel cells. Their role is to keep the catalyst tied to the electrode, but they must possess precise characteristics, in order to facilitate the work of a fuel cell (FC): these binders must show that they have good adhesion to electrodes, good resistance to corrosion and they have to facilitate electron transfer within the electrode through a high electrical conductivity. The most widely used binder is Nafion, a polymeric material that has consolidated operation and it is clearly recognized by the entire scientific community. Tests reported in this thesis will compare a sulfur-containing Polymer of Intrinsic Microporosity (sPIM) to see if it could be a good substitute for Nafion.