Encapsulated fullerene derivative, proton conductor, and a fuel cell

In the solid polymer fuel cell, as the material of the electrolyte membrane that conducts protons between the fuel electrode and the air electrode, conventionally, chemically modified material has been used to empty fullerenes such as C As an electrolyte membrane, electronegativity of a material obtained by chemically modifying the fullerenes containing three or more atoms in the proton-dissociative group, or electronegativity decided to use a material consisting of fullerenes containing not more than one atom . Than the empty fullerene material chemically modified with a proton dissociative groups, improvement of the proton conductivity, the effect on the internal resistance reduction of the fuel cell.