NOVELTY - Forming an electrode involves: (a1) pretreating a substrate surface; (b1) doping pretreated substrate surface with a catalyst for growing nanocarbons; (c1) disposing the doped substrate in a reactor and preheating to predetermined temperature; (d1) providing platinum precursor and carbon precursor in a form of a gas from each gasifier; and (e1) supplying gaseous platinum and carbon precursor to contactlessly-preheated reactor using a carrier gas to form nanocarbons and a core-shell-structured platinum-carbon composite on the surface of the substrate doped with the catalyst.    USE - For manufacturing an electrode which is useful for a fuel cell (claimed).    ADVANTAGE - Since the present method of manufacturing an electrode for a fuel cell produces an electrode having high performance and high durability for a short period of time at low cost using one-step process, this method is suitable for mass production. Also, according to the present method, composites having various properties and composition ratios can be synthesized by changing synthesis temperature and precursor composition. The present method is a simple process. The core-shell-structured platinum-carbon composite included in the present electrode improves catalytic activity and durability.    DETAILED DESCRIPTION - Manufacturing an electrode for a fuel cell, involves: (a1) pretreating a surface of a substrate; (b1) doping the pretreated surface of the substrate with a catalyst for growing nanocarbons; (c1) disposing the substrate doped with the catalyst in a reactor and preheating this substrate to predetermined temperature; (d1) providing a platinum precursor and a carbon precursor in the form of a gas from each gasifier; and (e1) supplying the gaseous platinum precursor and carbon precursor to the contactlessly-preheated reactor using a carrier gas to form nanocarbons and a core-shell-structured platinum-carbon composite on the surface of the substrate doped with the catalyst. The step (a1) sequentially involves: washing and drying a substrate; impregnating the washed and dried substrate with sulfuric acid or a mixed acid of sulfuric acid and nitric acid and treating this substrate with ultrasonic waves; and washing and drying the ultrasonically-treated substrate. The step (b1) sequentially involves: impregnating a substrate with a precursor of a catalyst for growing nanocarbons and applying ultrasonic waves to the substrate; maintaining the substrate for a predetermined amount of time; and drying the substrate. In the step (c1), the reactor is preheated at 400-1100 degrees C. In the step (d1), a liquid platinum precursor and a liquid carbon precursor are simultaneously gasified by their respective gasifiers, or a liquid platinum precursor is gasified by one gasifier and a gaseous carbon precursor is provided to another gasifier. In the step (e1), temperature is maintained around the boiling point of the gasified precursor to prevent the gasified precursor from being condensed. The core-shell-structured platinum-carbon composite is configured such that a core is made of platinum, a shell is made of carbon, and the core is partially or entirely covered by the shell. An INDEPENDENT CLAIM is included for an electrode for fuel cell, comprising: a substrate including nanocarbons on a surface of it, where a core-shell-structured platinum-carbon composite is dispersed on a surface of the nanocarbons.