Electrocatalyst using support material modified CO tolerant electrocatalyst of fuel cells

摘要

PURPOSE: An electrode catalyst for a fuel cell is provided, to reduce the contact probability between carbon monoxide and an active metal by using a porous supporter having pores whose diameter is smaller than the kinetic diameter of carbon monoxide, thereby reducing the poisoning of carbon monoxide. CONSTITUTION: The electrode catalyst comprises an active metal(21) adsorbed on the surface of a supporter(22) comprising carbon mainly and is obtained by adsorbing and reducing an active metal onto the inner surface of pores(V) and the outer surface of a porous supporter where the pores opened from the inside to the outside are formed in the total outer surface. Preferably the average diameter of the pore entrance meeting the outer surface of the supporter is 2-15 nm, and the total surface area of the supporter comprising the outer surface and the inner surface of pores open outside is 200-2,500 m2/g. Preferably the active metal is a Pt-M alloy, and M is selected from the group consisting of Ru, Sn, Os, Rh, Ir, Pd, V, Cr, Co, Ni, Fe and Mn.