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However, the heat treatment required for forming an ordered structure can lead to severe agglomeration and uneven distribution of nanoparticles, posing a significant challenge to efficient synthesis. Here, a molybdenum (Mo) assisted structural evolution strategy to controllably synthesize sub\u20104\u00a0nm Pt<jats:sub>3<\/jats:sub>Co intermetallic compounds is proposed. The results of experiments combined with density functional theory calculations demonstrate that the participation of trace Mo (0.2\u00a0wt.%) not only triggers the \u201cgrowth site locking effect\u201d and effectively suppresses the growth of nanoparticles, but also effectively adjusts the electronic structure, thereby optimizing the adsorption\/desorption of oxygen intermediates. The preeminent intrinsic activity on an optimized catalyst reaches a mass activity as high as 1.22\u00a0A\u00a0mg<jats:sub>Pt<\/jats:sub><jats:sup>\u22121<\/jats:sup> and has extraordinary stability with only a 5.7% decrease after 30\u00a0k cycles. This study paves a new path for the practical application of low Pt catalysts in PEMFCs in the future.<\/jats:p>","DOI":"10.1002\/smll.202503999","type":"journal-article","created":{"date-parts":[[2025,5,24]],"date-time":"2025-05-24T15:34:23Z","timestamp":1748100863000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Molybdenum Microalloying L1<sub>2<\/sub>\u2010Pt<sub>3<\/sub>Co Intermetallic Compounds via Bimodal Ordering Process by Mo Surface Termination and PDA\u2010Coated Particle Confinement for Stable PEMFC"],"prefix":"10.1002","volume":"21","author":[{"given":"Qiheng","family":"Wang","sequence":"first","affiliation":[{"name":"Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingkun","family":"Chen","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingbo","family":"Fu","sequence":"additional","affiliation":[{"name":"Changchun Gold Research Institute Co. 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