PRODUCTION METHOD FOR ELECTRODE CATALYST ELECTRODE CATALYST COMPOSITION FOR FORMING GAS DIFFUSION ELECTRODE GAS DIFFUSION ELECTRODE MEMBRANE-ELECTRODE ASSEMBLY MEA AND FUEL CELL STACK

摘要

A method for producing a catalyst for an electrode in which a catalyst for an electrode having a sufficiently reduced content of chlorine (Cl) species is obtained by a simple operation even when a catalyst precursor for an electrode containing a high concentration of chlorine is used as a raw material. 1. A method for producing a catalyst for an electrode having a core-shell structure comprising a core part formed on a carrier and a shell part formed so as to cover at least a part of the surface of the core part, The catalyst precursor for electrode (I), which is produced using a material containing chlorine (Cl) species and whose concentration of chlorine (Cl) species is higher than that of the first chlorine (Cl) species as measured by fluorescent X- A second step of adding a second liquid to the second liquid; The catalyst precursor for electrode (I) for electrode is washed with ultrapure water, and the resulting filtrate is washed until the electric conductivity (rho) of the resulting filtrate becomes less than or equal to the first set value. The obtained catalyst precursor for electrode (II) And a second step of preparing the second solution.