CATALYST FOR SOLID POLYMER FUEL CELLS AND METHOD FOR PRODUCING SAME

摘要

The present invention aims to provide a catalyst that makes it possible to reduce an amount of solid electrolyte mixed and improve initial performance of a fuel cell, and also a method for producing the catalyst. The present invention relates to a catalyst for a solid polymer fuel cell, which has sulfo groups (—SO3H) on catalyst particles. In TEM-EDX analysis, a ratio (IS/IPt) of a sulfur peak intensity (IS) to a platinum peak intensity (IPt) on the catalyst particles is within a range of 0.0044 or more and 0.0090 or less. The catalyst makes it possible to reduce the amount of solid electrolyte added and also a fuel cell with excellent initial performance, and thus contributes to a practical use of a fuel cell.

主权项

1. A catalyst for a solid polymer fuel cell, comprising catalyst particles containing platinum and cobalt supported on a carbon powder carrier,
the catalyst having sulfo groups (—SO3H) at least on the catalyst particles, in TEM-EDX analysis, a ratio (IS/IPt) of a sulfur peak intensity (IS) to a platinum peak intensity (Ipt) on the catalyst particles being within a range of 0.0044 or more and 0.0090 or less.