Patent application number | Description | Published |
20150318560 | METHOD FOR PRODUCING A CATALYST FOR FUEL CELLS - An object of the present invention is to provide a production method which can increase the activity of a catalyst particle comprising a core particle and an outermost layer, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle. The method is for producing a catalyst for fuel cells, in which a catalyst particle is supported by an electroconductive carrier, the method comprising the steps of: preparing a supported catalyst in which a catalyst particle comprising a core particle and an outermost layer is supported by an electroconductive carrier, the core particle comprising at least one of palladium and a palladium alloy, and the outermost layer comprising at least one of platinum and a platinum alloy and covering the core particle; acid treatment to bring the supported catalyst into contact with an acid solution which dissolves palladium more preferentially than platinum; and firing the supported catalyst at 80° C. or more and less than 200° C. in a reducing gas atmosphere after the acid treatment step. | 11-05-2015 |
20160049664 | CATALYST FOR FUEL CELLS AND METHOD FOR PRODUCING THE SAME - The present invention is to provide a catalyst for fuel cells, which is able to inhibit gas diffusion resistance and shows high IV characteristics far more than conventional fuel cell catalysts, and a method for producing the catalyst. Disclosed is a catalyst for fuel cells, comprising fine catalyst particles, each of which comprises a palladium-containing particle and an outermost layer containing platinum and covering the palladium-containing particle, and a carrier on which the fine catalyst particles are supported, wherein the catalyst for fuel cells satisfies 0.9×S1≦S2 in which S1 is a BET specific surface area of a material for the carrier, and S2 is a BET specific surface area of the carrier in the catalyst for fuel cells. | 02-18-2016 |
20160079607 | METHOD FOR PRODUCING FINE CATALYST PARTICLE AND FUEL CELL COMPRISING FINE CATALYST PARTICLE PRODUCED BY THE PRODUCTION METHOD - Disclosed is a method for producing a fine catalyst particle comprising a palladium-containing particle and a platinum outermost layer covering the palladium-containing particle, wherein a first composite body containing palladium and platinum is formed by mixing the palladium-containing particle with a first solution in which a platinum compound is dissolved, and then covering at least part of a surface of the palladium-containing particle with platinum; wherein a second composite body containing palladium, platinum and copper is formed by mixing the first composite body with a second solution in which a copper compound is dissolved, and then covering at least part of a surface of the first composite body with copper using copper underpotential deposition; and wherein the copper in the second composite body is substituted with platinum derived from a third solution in which a platinum compound is dissolved. | 03-17-2016 |