| abstract |
A highly active supported catalyst, a method for producing the supported catalyst, a membrane electrode assembly, and a fuel cell are provided. A conductive carrier and a peak supported by a metal bond of a T element in a spectrum by X-ray photoelectron spectroscopy (XPS) having a composition represented by the following formula (1) supported on the conductive carrier. And a catalyst particle having an area of 15% or more of the peak area due to oxygen bonding of the T element. Pt x Ru y T z (1) However, the T element is at least one element selected from the group consisting of V, Nb and Hf, and x is 30 at. % Or more, 60 at. % Or less, y is 20 at. % Or more, 50 at. % And z is 5 at. % Or more, 50 at. % Or less. [Selection figure] None |