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Herein, carbon\u2010supported 0D\/2D PtCuBi\/C (0D\/2D PtCuBi\/C) catalysts are fabricated through a solvothermal method, followed by a partial electrochemical dealloying process to form a novel mixed\u2010dimensional electrochemically dealloyed PtCuBi\/C (0D\/2D D\u2010PtCuBi\/C) catalysts. Benefiting from distinctive mixed\u2010dimensional structure and composition, the as\u2010obtained 0D\/2D D\u2010PtCuBi\/C catalysts possess abundant accessible active sites. The introduction of Cu as a water\u2010activating element weakens the CO<jats:sub>ads<\/jats:sub>, and oxophilic metal Bi facilitates the OH<jats:sub>ads<\/jats:sub>, thereby enhancing its tolerance to CO poisoning and promoting MOR activity. The X\u2010ray photoelectron spectroscopy (XPS) and X\u2010ray absorption fine structure spectroscopy (XAFS) collectively reveal the electron transfer from Cu and Bi to Pt, the electron\u2010enrichment effect induced by dealloying, and the strong interactions among Pt\u2010M (Cu, Pt, and Bi) multi\u2010active sites, which improve the tuning of the electronic structure and enhancement of electron transfer ability. Impressively, the optimized 0D\/2D D\u2010PtCuBi\/C catalysts exhibit the superior mass activity (MA) of 17.68 A mg<jats:sub>Pt<\/jats:sub><jats:sup>\u22121<\/jats:sup> for MOR, which is 14.86 times higher than that of commercial Pt\/C. This study offers a proposed strategy for Pt\u2010based alloy catalysts, enabling their use as efficient anodic materials in fuel cell applications.<\/jats:p>","DOI":"10.1002\/smll.202309226","type":"journal-article","created":{"date-parts":[[2023,12,21]],"date-time":"2023-12-21T12:29:41Z","timestamp":1703161781000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Mixed\u2010Dimensional Partial Dealloyed PtCuBi\/C as High\u2010Performance Electrocatalysts for Methanol Oxidation with Enhanced CO Tolerance"],"prefix":"10.1002","volume":"20","author":[{"given":"Sichen","family":"Li","sequence":"first","affiliation":[{"name":"Department of Chemistry and Center for Atomic Engineering of Advanced Materials School of Materials Science and Engineering Anhui Province Key Laboratory of Chemistry for Inorganic\/Organic Hybrid Functionalized Materials Anhui University  Hefei 230601 P. R. 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