Electrode catalyst of electrochemical device, electrocatalyst layer of electrochemical device, film / electrode assembly of electrochemical device, electrochemical device, method for producing electrode catalyst of electrochemical device, and method for manufacturing film / electrode assembly of electrochemical device

摘要

To provide an electrocatalyst for an electrochemical device that can reduce poisoning of a catalytic metal by an ionomer.SOLUTION: An electrode catalyst for an electrochemical device according to the present disclosure includes a mesoporous material, and catalytic metal particles supported at least inside the mesoporous material, and the mesoporous material has mesopores having a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm/g before supporting the catalyst metal particles, and the number density of the catalytic metal particles supported in the mesopores is smaller on the outside than on the inside of the mesoporous material.SELECTED DRAWING: Figure 1