▎ 摘　　要

NOVELTY - Method for modifying catalyst, comprises (a) mixing catalyst containing a carrier and metal particles loaded on the carrier with a reducing agent in a first solvent to obtain a mixed solution, (b) performing thermal reduction treatment to the mixed solution to separate solid and liquid to obtain a modified catalyst, and (c) performing liquid-liquid separation treatment. USE - The method is useful for preparing a modified catalyst, which is useful in a fuel cell, where the fuel cell is a high-efficiency energy conversion device, with clean and pollution-free, high conversion efficiency and high power density. ADVANTAGE - The method enables to modify catalyst that has excellent durability, and reduces the carbon carrier oxygen content, and improves the electrochemical stability of the catalyst, which can effectively and obviously improve the durability of the membrane electrode to improve durability of fuel cell membrane electrode. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a modified catalyst; (2) a catalyst layer; (3) a membrane electrode; (4) a preparation method of the membrane electrode; (5) a fuel cell.