CATALYST PARTICLES, AND ELECTROCATALYST, ELECTROLYTE MEMBRANE-ELECTRODE ASSEMBLY, AND FUEL CELL USING SUCH CATALYST PARTICLES

摘要

An object is to provide a catalyst particle that can exhibit high activity. The catalyst particle is an alloy particle formed of platinum atom and a non-platinum metal atom, wherein (i) the alloy particle has an L1 2 structure as an internal structure and has an extent of ordering of L1 2 structure in the range of 30 to 100%, (ii) the alloy particle has an LP ratio calculated by CO stripping method of 10% or more, and (iii) the alloy particle has a d N /d A ratio in the range of 0.4 to 1.0.