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Surface curvature regulation may endow electrocatalysts with enhanced atomic utilization and abundance of unsaturated atoms; however, a reliable synthetic route for controlled construction of tailorable curved surface is still lacking. Here, a colloidal\u2010chemical method to synthesize two types of PtCu branched\u2010structured electrocatalysts, where the concave curvature can be customized is reported. These studies show that, among various synthesis parameters, the concentration of CuCl<jats:sub>2<\/jats:sub>\u00b72H<jats:sub>2<\/jats:sub>O precursor is the key factor in manipulating the reaction kinetics and determining the concave surface curvature. Significantly, PtCu branched nanocrystals with long and sharp arms (PtCu BNCs\u2010L), featuring a high concave surface curvature, exhibit remarkable activity and stability toward MOR, which is mainly attributed to advanced features of a highly concave surface and the synergistically bifunctional effect from introduced oxophilic Cu metal. In situ Raman spectroscopy and CO stripping test demonstrates weakened CO adsorption and accelerated CO removal on PtCu BNCs\u2010L. This work highlights the importance of surface curvature, opening up an appealing route for the design and synthesis of advanced electrocatalysts with well\u2010defined surface configurations.<\/jats:p>","DOI":"10.1002\/smll.202307970","type":"journal-article","created":{"date-parts":[[2023,12,6]],"date-time":"2023-12-06T19:23:10Z","timestamp":1701890590000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Cu Tailoring Pt Enables Branched\u2010Structured Electrocatalysts with High Concave Surface Curvature Toward Efficient Methanol Oxidation"],"prefix":"10.1002","volume":"20","author":[{"given":"Yidan","family":"Sun","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering College of Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing 211816 P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Tian","sequence":"additional","affiliation":[{"name":"Engineering and Materials Science Experiment Center University of Science and Technology of China  Hefei 230026 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuping","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering College of Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing 211816 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhui","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering College of Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing 211816 P. R. 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