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The design leverages three synergistic mechanisms: oxophilic Ru sites in the Pt\u2010rich shell facilitate water dissociation to generate *OH for efficient *CO oxidation; lattice mismatch between the ternary PtCuRu core and trace Ru\u2010doped Pt\u2010rich shell induces compressive strain, downshifting the Pt\n                    <jats:italic>d<\/jats:italic>\n                    \u2010band center to weaken *CO adsorption; and the Pt\u2010rich shell acts as a diffusion barrier suppressing Cu dissolution. As a result, PtCuRu\u20100.05@PtRu delivers the highest mass activity of 1.208 A mg\n                    <jats:sub>Pt<\/jats:sub>\n                    <jats:sup>\u22121<\/jats:sup>\n                    , surpassing PtCu@Pt and commercial Pt\/C samples. Moreover, PtCuRu\u20100.05@PtRu exhibits superior durability, maintaining the highest current density during 3600 s chronoamperometry and showing only 3.31% activity decay after five consecutive stability tests (18,000 s), with preserved structural integrity. This work provides a viable strategy for simultaneously enhancing MOR activity and durability via synergistic composition and structure engineering.\n                  <\/jats:p>","DOI":"10.1002\/advs.75638","type":"journal-article","created":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T08:15:06Z","timestamp":1778832906000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Trace Ru\u2010Doped PtCuRu@PtRu Core\u2010Shell Electrocatalyst for CO\u2010Resilient Methanol Oxidation"],"prefix":"10.1002","volume":"13","author":[{"given":"Tianrui","family":"Xue","sequence":"first","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education School of Chemical Engineering East China University of Science and Technology  Shanghai P. R. 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