▎ 摘　　要

NOVELTY - Preparing catalyst having core-shell structure having platinum layer comprises (a) preparing a transition metal supported on a carbon support; (b) heat-treating the transition metal supported on the carbon support in an ammonia atmosphere to prepare a transition metal nitride supported on the carbon support; and (c) reacting by adding hydrogen gas together with a platinum precursor to the transition metal nitride supported on the carbon support to form a platinum layer on the surface of the transition metal nitride to prepare a transition metal nitride core-platinum shell catalyst. USE - The catalyst is useful for manufacturing fuel cell electrode (claimed). ADVANTAGE - The method enables mass synthesis of the catalyst through a simple wet chemical process, minimizes chemicals required for the process, and is environmentally-friendly.