Patent ID: 8168348
Filing Date: 2012-05-01
Classification: H01M,Y02E

Abstract:
1. A process for the preparation of electrochemical catalysts of fuel cells based on polymer electrolytes to uniformly disperse metal particles in a support, the process including the steps of: A) injecting a carbon support and a solvent into a first reactor installed with a high output ultrasonic wave oscillator and an agitator; B) dispersing the carbon support into a primary particle level using a high output ultrasonic wave, thereby maximizing a specific surface area of the carbon support; C) preparing a precursor solution formed with a micelle containing precursor ions by adding a surfactant and an aqueous solution having dissolved metal precursor to a second reactor; D) injecting the precursor solution manufactured in step C) into the dispersion of step B) while the high output ultrasonic wave oscillator and the agitator are concurrently operating and allowing the micelle to be adsorbed on the surface of the carbon support; E) forming nuclei of metal particles by injecting a reducing agent at 30 to 70° C. into a mixture of precursor solution and dispersion recited in step D) while the high output ultrasonic wave oscillator and the agitator are concurrently operating; F) stopping the high output ultrasonic wave and growing the size of metal particles to 2 to 5 nm by raising a temperature up to 80 to 100° C.; G) rapid cooling the metal particles; H) cleaning the micelle surrounding the metal particles; and I) drying the metal particles, wherein the metal particles are uniformly supported on a surface of the carbon support and have high catalyst activity.