Abstract: To produce a core-shell catalyst with high catalytic activity for a short period of time. Disclosed is a method for producing a core-shell catalyst comprising a core containing palladium and a shell containing platinum and coating the core, the method comprising: supplying palladium-containing particles and a copper-containing material to an acid solution; stirring the acid solution with introducing an oxygen-containing gas into the acid solution; coating at least a part of a surface of the palladium-containing particles with copper by applying a potential that is nobler than the oxidation reduction potential of copper to the palladium-containing particles in a copper ion-containing electrolyte after the stirring; and then forming the shell by substituting the copper coating at least a part of the surface of the palladium-containing particles with platinum by bringing the palladium-containing particles into contact with a platinum ion-containing solution.

Abstract: To produce a core-shell catalyst with high catalytic activity for a short period of time. Disclosed is a method for producing a core-shell catalyst comprising a core containing palladium and a shell containing platinum and coating the core, the method comprising: supplying palladium-containing particles and a copper-containing material to an acid solution; stirring the acid solution with introducing an oxygen-containing gas into the acid solution; coating at least a part of a surface of the palladium-containing particles with copper by applying a potential that is nobler than the oxidation reduction potential of copper to the palladium-containing particles in a copper ion-containing electrolyte after the stirring; and then forming the shell by substituting the copper coating at least a part of the surface of the palladium-containing particles with platinum by bringing the palladium-containing particles into contact with a platinum ion-containing solution.