"Platinum Containing Catalyst And Method Of Producing The Same, Electrode And Electrochemical Device"

Abstract: There are provided a core-shell type platinum-containing catalyst being allowed to reduce the amount of used platinum and having high catalytic activity and stability and a method of producing the same, an electrode and an electrochemical device. The core-shell type platinum-containing catalyst includes a core particle (with an average particle diameter R1) made of a non-platinum element and a platinum shell layer (with an average thickness ts) satisfying 1.4 nm≤R1≤3.5 nm and 0.25 nm≤ts≤0.9 nm. The core particle includes an element satisfying Eout≥3.0 eV, where average binding energy relative to the Fermi level of 5d orbital electrons of platinum present on an outermost surface of the shell layer is Eout. In a fuel cell including a platinum-containing catalyst which contains a Ru particle as a core particle, the output density at a current density of 300 mA/cm2 is 70 mW/cm2 or over, and an output retention ratio is approximately 90% or over.

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