Patent ID: 7157402
Filing Date: 2007-01-02
Classification: B82Y,C01B,H01M,Y02E,Y10T

Abstract:
1. A method of preparing an electrocatalyst for an PEM fuel cell, the method comprising: a) dissolving a water-soluble salt of a catalytic metal in water; b) injecting an aqueous slurry of a spherical bimodal porous carbon capsule with a hollow core and a mesoporous shell structure in a reaction container, and mixing the slurry with the solution of the metal salt; c) adding water to make the water-soluble metal salt have a concentration of 1 mM to 3 mM, and diluting and stirring the mixture of water and the water-soluble metal salt; d) adding basic or acidic aqueous solution to the reaction solution, and allowing the reaction solution to have a pH of 8 to 9; e) adding a reducing agent to the reaction solution and forming a precipitate; and f) recovering the catalyst by leaving and precipitating the reaction solution, repeatedly cleaning the precipitate with water, drying the precipitate.