• • FeY-Pt-C (20% Pt) delivers 1071 mA mg_Pt^-1 mass activity, 2.23× that of Pt-C (20% Pt), directly reducing Pt loading and catalyst cost for electrochemical hydrogen pumps.
• • Under 5000 ppm NH3, FeY-Pt-C retains 93.1% of initial activity, whereas conventional Pt-C suffers severe poisoning; this threshold exceeds typical residual ammonia levels in ammonia-cracked hydrogen, enabling direct purification without upstream scrubbing.
• • Machine learning with Shapley Additive Explanations identified Fe and Y as optimal dual modulators, cutting experimental screening from exhaustive trial-and-error to a targeted alloy design, accelerating catalyst development cycles.
• • Fe specifically promotes PtY alloy formation over stable Y oxide phases, ensuring electronic modulation of Pt that weakens NH3 adsorption; without Fe, Y oxide formation renders the catalyst ineffective, highlighting a critical compositional constraint for scalable synthesis.