Method for producing catalysts with nanoparticles of platinum and its alloys with metals

A method for producing catalysts with nanoparticles of platinum or its alloys with metals, for a cathode and an anode of low-temperature fuel cells and electrolyzers, wherein each alloy comprises platinum and at least one metal, comprising:

• preparation of a solution of chloroplatinic acid or a mixture of chloroplatinic acid with at least one metal salt in water or in an aqueous organic solvent;
• mixing thereof with dispersed carbon or non-carbon carriers, or their mixtures, or compositions with specific surface area of more than 60 m2/g;
• dispersing the obtained mixture to obtain a suspension;
• alkalizing to a pH between 6 and 11 of said suspension;
• wherein gas selected from the group consisting of:
• nitrogen oxides, carbon dioxide (CO2), sulfur oxide (SO2), ammonia (NH3), and their mixtures is purged through the obtained suspension at a temperature of the obtained suspension in a range from 5 to 98° C., to produce said catalysts with nanoparticles of platinum or its alloys with metals, and wherein said catalysts are suited for said cathode and said anode of said low-temperature fuel cells and said electrolyzers, wherein nitrogen oxides are N2O, NO, and NO2;
• and
• adjusting a time interval occurring between said preparation of said solution of chloroplatinic acid or said mixture of chloroplatinic acid with said at least one metal salt in said water or in said aqueous organic solvent and when said selected gas is purged therethrough, to produce said catalysts with said nanoparticles of platinum or its alloys with metals, for said cathode and said anode of said low-temperature fuel cells and electrolyzers.