| abstract |
PROBLEM TO BE SOLVED To provide an MEA having a high mass activity, an electrode catalyst suitable for the MEA, and the like. An electrode catalyst in which catalytic metal fine particles are supported on a conductive carbon support having at least a surface layer graphitized, wherein the graphitized conductive carbon particle has 10 to 100 edges per unit area (900 nm 2 ). It is an electrode catalyst characterized by having. The effective surface area of the support can be increased and the catalytic metal utilization rate can be improved, thereby increasing the amount of power generation per unit cell area. [Selection] Figure 3 |