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Herein, we overcome this long\u2010standing challenge via a binary salt matrix (KCl\u2010Na\n                    <jats:sub>2<\/jats:sub>\n                    HPO\n                    <jats:sub>4<\/jats:sub>\n                    ) strategy that drives disorder\u2010to\u2010order phase transition of carbon\u2010supported Pt\n                    <jats:sub>3<\/jats:sub>\n                    Co catalysts. Mechanistic studies suggest that in\u2010situ generated Na\n                    <jats:sub>4<\/jats:sub>\n                    P\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>7<\/jats:sub>\n                    in binary salt matrix contributes to the partial removal of surface CoO, thereby weakening the surface oxide constraint and creating favorable conditions for the subsequent ordering process. Meanwhile, the binary salt matrix provides a flexible confinement environment that limits excessive nanoparticle growth and is proposed to facilitate atomic rearrangement during the disorder\u2010to\u2010order transition. The resulting catalyst, featuring an ordered Pt\n                    <jats:sub>3<\/jats:sub>\n                    Co core and Pt shell, exhibits a peak power density of 1.4\u00a0W cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    in H\n                    <jats:sub>2<\/jats:sub>\n                    \/air single cell and maintained 85% of its peak power density after 30\u00a0000 cycles of accelerated durability tests (ADT), outperforming disordered Pt\n                    <jats:sub>3<\/jats:sub>\n                    Co catalyst. This work provides an innovative strategy for the large\u2010scale direct preparation of carbon support Pt\u2010based intermetallic compounds at low temperature, providing great significance for promoting the development of advanced catalysts.\n                  <\/jats:p>","DOI":"10.1002\/smll.74717","type":"journal-article","created":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T10:21:39Z","timestamp":1784888499000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Unlocking Low\u2010Temperature Ordering of Supported Pt\u2010Based Intermetallic Compounds via Binary Salt\u2010Matrix Strategy"],"prefix":"10.1002","volume":"22","author":[{"given":"Dongxu","family":"Cao","sequence":"first","affiliation":[{"name":"New Cornerstone Science Laboratory State Key Laboratory For Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and National and Local Joint Engineering Research Center of Preparation Technology of Nanomaterials College of Chemistry and Chemical Engineering Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meixi","family":"Zhang","sequence":"additional","affiliation":[{"name":"New Cornerstone Science Laboratory State Key Laboratory For Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and National and Local Joint Engineering Research Center of Preparation Technology of Nanomaterials College of Chemistry and Chemical Engineering Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoran","family":"Wang","sequence":"additional","affiliation":[{"name":"New Cornerstone Science Laboratory State Key Laboratory For Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and National and Local Joint Engineering Research Center of Preparation Technology of Nanomaterials College of Chemistry and Chemical Engineering Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4800-6236","authenticated-orcid":false,"given":"Yazhou","family":"Zhang","sequence":"additional","affiliation":[{"name":"New Cornerstone Science Laboratory State Key Laboratory For Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and National and Local Joint Engineering Research Center of Preparation Technology of Nanomaterials College of Chemistry and Chemical Engineering Xiamen University  Xiamen China"},{"name":"School of Advanced Energy, IGCME Shenzhen Campus of Sun Yat\u2010Sen University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Luo","sequence":"additional","affiliation":[{"name":"New Cornerstone Science Laboratory State Key Laboratory For Physical Chemistry of Solid Surfaces Collaborative 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