METHOD FOR MANUFACTURING FUEL CELL CATHODE ELECTRODE AND FUEL CELL CATHODE ELECTRODE

摘要

Provided is, for example, a method for manufacturing a fuel cell cathode electrode. At the cathode electrode of a fuel cell, a reaction occurs in which water is produced at the three-phase interface on a catalyst particle surface. The area of this three-phase interface is proportional to the effective surface area (or ECA) of a catalyst particle, so that if the ECA is prevented from decreasing, high output characteristics can be obtained over a long period of time. In a conventional electrode, a perfluorocarbon sulfonic acid polymer, which is a strong acid material, has been used as a polymer electrolyte. When such strong acid material is used, however, there has been a problem that under a normal fuel cell power generation condition, catalyst particles are eluted and reduction of the ECA tends to occur. The above problem is solved, for example, in such a way that: steps (S11 to S16) are included in the method for manufacturing a fuel cell cathode electrode; and a compound is used that has a sulfonic acid group in a molecule as a polymerizable electrolyte precursor (1) and a group represented by (R1O)3Si-, where R1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.