Electrocatalyst layer for electrochemical device, membrane / electrode assembly for electrochemical device, electrochemical device, and method for producing electrode catalyst layer for electrochemical device

摘要

An electrode catalyst layer of an electrochemical device is an electrode catalyst layer of an electrochemical device, the electrode catalyst layer including a mesoporous carbon; a catalyst metal supported at least in the mesoporous carbon; and an ionomer. Before supporting the catalyst metal, the mesoporous carbon has mesopores with a mode radius of 1 nm to 25 nm and a pore volume of 1.0 cm 3 /g to 3.0 cm 3 /g and has an average particle diameter of 200 nm or more.