HIGH ACTIVITY ALLOY-BASED ELECTRODE CATALYST, AND MEMBRANE ELECTRODE ASSEMBLY AND FUEL CELL USING HIGH ACTIVITY ALLOY-BASED ELECTRODE CATALYST

摘要

Provided is a catalyst that can exhibit high activity. An electrocatalyst is formed by catalytic metal being supported by a catalyst support. The catalytic metal includes platinum and a metal component other than platinum. The electrocatalyst has meso holes, which have a radius of 1 nm or greater, with the mode radius of hole distribution for the meso holes being 1 nm or greater and less than 2.5 nm. Alloy microparticles of the platinum and the metal component other than platinum are supported in the meso holes, and the molar ratio for the platinum content with respect to the metal component other than platinum in alloy microparticles supported in the meso holes is 1.0 - 10Ø