| 摘要 |
The present invention is directed to improving a catalyst applied to a reaction layer having a structure (PFF structure) in which a polymer electrolyte phase surrounds a periphery of a catalyst with a hydrophilic region interposed therebetween and reducing the amount of catalyst metal particles used. A method for producing a catalyst for a fuel cell, in which a catalyst metal particle is supported on a carrier, includes the steps of: preparing an unmodified catalyst in which a catalyst metal particles is supported on a carrier; and modifying the catalyst metal particle in the unmodified catalyst with at least one type of modifying group selected from a nitric acid group, an amino group, a sulfonic acid group, a hydroxy group, and halogen groups.
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