METHOD FOR PREPARING COLLOIDAL SOLUTION AND CARRIER HAVING COLLOIDAL PARTICLES FIXED ON SURFACE THEREOF, FUEL CELL CATHODE, FUEL CELL ANODE AND METHOD FOR PREPARING THE SAME AND FUEL CELL USING THE SAME, AND LOW TEMPERATURE OXIDATION CATALYST, METHOD FOR PREPARING THE SAME AND FUEL CELL FUEL MODIFYING DEVICE USING THE SAME

摘要

A method for forming colloidal particles and preparing a colloidal solution through the boil of a solution containing a metal salt and a reducing agent, wherein the solution has a metal salt concentration of 1 .times. 10-4 mol/L or more and less than 4 .times. 10-4 mol/L, the equivalent concentration of the reducing agent is 4 to 20 times that of the metal salt, and the reaction tim e is 60 to 300 min; a carried composite material comprising a substrate and th e colloidal particles fixed thereon through applying a colloidal solution prepared by the above method to the substrate; and a method for preparing a fuel cell cathode, a fuel cell anode or a low temperature oxidation catalyst , which comprises preparing a colloidal solution in a state free of oxygen through the boil of a solution containing a metal salt and a reducing agent and applying the colloidal solution to a substrate, to fix colloidal particl es to the substrate.