NOVELTY - A carbon capsule with a hollow core and a mesoporous shell structure.    USE - As an electrocatalyst support for a fuel cell (claimed).    ADVANTAGE - The electrocatalyst has higher activity as compared with the Pt-Ru or Pt catalyst supported by the conventional carbon black, thus the performance of the fuel cell is enhanced. The porous carbon support employed for the catalyst has excellent conductivity and higher surface area, thus the loaded catalyst can be prepared with smaller amount than the conventional carbon black. The metal particles having an extremely fine size 2 - 3 nm are uniformly distributed on the support, thus the area of an active site at which catalysis reaction performed is increased and increases the catalyst activity with respect to the oxidation reaction of the fuel such as methanol, ethanol and hydrogen. Fine porous carbon support secures a duel dispersing passage, thus the fuel including alcohol (e.g. methanol or ethanol) or hydrogen can be easily transferred and dispersed, and efficiently performing its oxidation-reduction reaction.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for    (1) a catalyst for polymer electrolyte membrane (PEM) fuel cell, prepared by loading at least one metal selected from platinum, ruthenium, rhodium, molybdenum, osmium, iridium, rhenium, palladium, vanadium and tungsten into the capsule; and    (2) preparation of the electrocatalyst, involving:    (a) dissolving a soluble catalytic metal in water;    (b) injecting an aqueous slurry of the claimed carbon capsule into a reaction container and mixing the slurry of the metal salt solution;    (c) adding water to adjust the salt concentration to 1-3 mM;    (d) adding an acid or base to the reaction solution to adjust the pH to 8-9;    (e) adding a reducing agent to the reaction solution to form a precipitate; and    (f) recovering the catalyst by leaving and precipitating the reaction solution repeatedly cleaning the precipitate with water, then drying the precipitate.