▎ 摘　　要

NOVELTY - Macro-preparation of supported high-dispersion, small-size platinum-based ordered alloy electrocatalyst comprises impregnating mesoporous silicon with a metal precursor, heat-treating, annealing, dispersing with carrier in a dispersion solvent to obtain dispersion, and etching mesoporous silicon in the dispersion. USE - The method is used for macro-preparing supported high-dispersion, small-size platinum-based ordered alloy electrocatalyst for fuel cell. ADVANTAGE - The method is simple, environment-friendly and suitable for large scale production. The prepared catalyst has high oxygen reduction activity and stability.