CATALYST FOR POLYMER SOLID ELECTROLYTE TYPE FUEL-CELL AND METHOD FOR PRODUCING CATALYST FOR POLYMER SOLID ELECTROLYTE TYPE FUEL-CELL

摘要

A catalyst for polymer solid electrolyte type fuel-cell which has platinum and ruthenium carried thereon in a ratio of 2 to 4 : 8 to 6 (mole ratio) and is excellent in resistance to catalyst poisoning by carbon monoxide. A method of producing the above catalyst which comprises adding an alcohol to a mixed solution of an aqueous solution of a ruthenium compound with a platinum catalyst, and reducing the resulting mixture at a temperature of 60 DEG C or higher and not higher than the boiling temperature of the resulting mixture to thereby precipitate ruthenium is also disclosed. It is preferred that methanol or ethanol is added in a concentration of 5 to 15 vol % based on the volume of the total mixed solution and the mixed solution after the addition of ethanol or methanol is heated to a temperature near the boiling thereof. This method allows platinum and ruthenium metal particles to be carried with no agglomeration and in the vicinity of each other, and thus enables the production of a platinum/ruthenium catalyst for polymer solid electrolyte type fuel-cell being excellent in resistance to catalyst poisoning by carbon monoxide.