Confined Subnanometer Amorphous RuIrO x Overlayers on Ultrafine Pt Nanowires Achieve Ampere‐Level Durable PEM Water Electrolysis

and maintains long-lasting operation for over 2000 h. Mechanistic studies validate that the flexible amorphous surface vitalizes the coexistence of multiple reaction pathways, along with an unprecedented lattice oxygen self-healing capability. These findings establish surface amorphous phase engineering as a powerful strategy for designing high-performance electrocatalysts.