ELECTRODE CATALYST OF ELECTROCHEMICAL DEVICE, ELECTRODE CATALYST LAYER OF ELECTROCHEMICAL DEVICE, MEMBRANE ELECTRODE ASSEMBLY OF ELECTROCHEMICAL DEVICE, ELECTROCHEMICAL DEVICE, METHOD FOR MANUFACTURING ELECTRODE CATALYST OF ELECTROCHEMICAL DEVICE, AND METHOD FOR MANUFACTURING MEMBRANE ELECTRODE ASSEMBLY OF ELECTROCHEMICAL DEVICE

摘要

An electrode catalyst of an electrochemical device according to the present disclosure is an electrode catalyst of an electrochemical device, the electrode catalyst including a mesoporous material; and catalyst metal particles supported at least in the mesoporous material. Before supporting the catalyst metal particles, the mesoporous material includes mesopores having a mode radius of 1 to 25 nm and a pore volume of 1.0 to 3.0 cm³/g, and number density of the catalyst metal particles supported in the mesopores is lower at an outer side of the mesoporous material than number density of the catalyst metal particles supported in the mesopores at an inner side thereof.