| abstract |
Disclosed is an electrode catalyst that can suppress / prevent corrosion / deterioration of a conductive material, thereby exhibiting excellent durability and high catalytic activity over a long period of time. In an electrode catalyst in which catalyst particles are supported on a conductive material, when the average particle diameter of the catalyst particles supported on the conductive material is X, 3 adjacent to any given catalyst particle A. An electrode catalyst, wherein the catalyst particles are supported on a conductive material so that the center of gravity of each of the two or more catalyst particles is in the range of a distance of 0.5X to 2X from the center of gravity of the catalyst particles A. [Selection figure] None |