Patent ID: 8383287

Claim:
A fuel cell electrode catalyst in which at least one transition metal element selected from the group consisting of ruthenium (Ru), molybdenum (Mo), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), iron (Fe), nickel (Ni), palladium (Pd), and rhenium (Re) and at least one chalcogen element selected from the group consisting of sulfur (S), selenium (Se), and tellurium (Te) are supported on a conductive support, wherein the fuel cell electrode catalyst comprises: a core portion comprising a conductive support and a transition metal crystal directly supported on the conductive support and a shell portion comprising chalcogen elements and surface atoms of the transition metal crystal to which the chalcogen elements are coordinating, and the outer circumference of the core portion is partially covered with the shell portion.