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The sluggish kinetics of oxygen reduction reaction (ORR) and unsatisfactory durability of Pt‐based catalysts are severely hindering the commercialization of proton‐exchange‐membrane fuel cells (PEMFCs). In this work, the lattice compressive strain of Pt‐skins imposed by Pt‐based intermetallic cores is tailored for highly effective ORR through the confinement effect of the activated nitrogen‐doped...