Carrier-nanoparticle complex, method for preparing same, and catalyst comprising same

A method for preparing a carrier-nanoparticle complex in which core-shell nanoparticles are supported on a carrier, the method comprising:

• forming a first solution comprising an aqueous solvent, a precursor of a first metal, a precursor of a second metal, and the carrier;
• forming a core portion comprising the first metal and the second metal by adding a first reducing agent to the first solution;
• adjusting a pH of the first solution to 8 or more between the forming of the first solution and the forming of the core portion;
• forming a second solution by adding a Pt precursor to the first solution after the forming of the core portion;
• forming a shell portion comprising Pt on at least a portion of a surface of the core portion by adding a second reducing agent to the second solution;
• and
• adjusting a pH of the second solution to 8 or more between the forming of the second solution and the forming of the shell portion,
• wherein the first metal is Pd, and the second metal is cobalt (Co), iron (Fe), or copper (Cu),
• wherein the core-shell nanoparticles have a particle diameter of 1 nm or more and 10 nm or less,
• wherein at least a portion of a surface of the carrier is coated with a polymer electrolyte which comprises one or more functional groups comprising nitrogen;
• wherein the forming of the shell portion is carried out at a temperature of 4° C. to 35° C.;
• wherein the forming of the core portion is carried out at a temperature of 50° C. or more and 75° C. or less, and
• wherein the first reducing agent and the second reducing agent each are at least one selected from the group consisting of NaBH4, NH2NH2, LiAlH4, and LiBEt3H.