▎ 摘　　要

NOVELTY - A carbon-supported core-shell structure alloy particle catalyst is produced by (a) preparing suspension for reduction reaction by dispersing carbon-based support on which core nanoparticles made of 1st metal are supported in distilled water; (b) adding 2nd metal precursor to the suspension for reduction reaction of 1st metal core nanoparticles supported on the support and performing a reduction reaction to obtain resultant solution of a reduction reaction and forming core-shell structured alloy particle comprising 2nd metal shell layer formed on the surface of the core nanoparticles; and (c) adding precursor of 3rd metal to resultant solution of reduction reaction and performing a galvanic substitution reaction to prepare alloy particles having a core-shell structure in which a portion or all of 2nd metal is substituted with 3rd metal. USE - Production of carbon-supported core-shell structure alloy particle catalyst for oxygen reduction reaction (claimed). ADVANTAGE - The carbon-supported core-shell structured alloy particle catalyst can be mass-produced at a low production cost, which has an advantageous effect in terms of price competitiveness. In addition, it is environment-friendly by limiting the use of chemicals, such as reducing agents or surfactants, and there is no process such as heat treatment and/or acid treatment, so that the carbon-supported core-shell structure alloy particle catalyst can be easily prepared. The carbon-supported core-shell structured alloy particle catalyst exhibits excellent oxygen reduction activity and durability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for carbon-supported core-shell structure alloy particle catalyst comprising (A) carbon-based support; (B) a set of 1st metal nanoparticle cores supported on the carbon-based support; and (C) 2nd metal shell layer formed on the surface of the set of 1st metal nanoparticle cores, where a portion or all of the 2nd metal forming the shell layer is substituted with 3rd metal.