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In this study, for the first time, an innovative assistive active sites (AAS) strategy is proposed to construct high\u2013loading (3.46wt.%) single Fe\u2500N<jats:sub>4<\/jats:sub> as AAS, which are further hybridized with small Pt nanoparticles to enhance both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) activities. For ORR, the target catalyst (Pt\/HFe<jats:sub>SA<\/jats:sub>\u2013HCS) exhibits a higher mass activity (MA) of 0.98\u00a0A\u00a0mg<jats:sub>Pt<\/jats:sub><jats:sup>\u22121<\/jats:sup> and specific activity (SA) of 1.39\u00a0mA\u00a0cm<jats:sub>Pt<\/jats:sub><jats:sup>\u22122<\/jats:sup> at 0.90\u00a0V versus RHE. As for MOR, Pt\/HFe<jats:sub>SA<\/jats:sub>\u2013HCS shows exceptional MA (3.21\u00a0A\u00a0mg<jats:sub>Pt<\/jats:sub><jats:sup>\u22121<\/jats:sup>) and SA (4.27\u00a0mA\u00a0cm<jats:sub>Pt<\/jats:sub><jats:sup>\u22122<\/jats:sup>) at peak values, surpassing commercial Pt\/C by 15.3 and 11.5 times, respectively. The underlying mechanism behind this AAS strategy is to find that in MOR, Fe\u2500N<jats:sub>4<\/jats:sub> promotes water dissociation, generating more *OH to accelerate the conversion of *CO to CO<jats:sub>2<\/jats:sub>. Meanwhile, in ORR, Fe\u2500N<jats:sub>4<\/jats:sub> acts as a competitor to adsorb *OH, weakening Pt\u2500OH bonding and facilitating desorption of *OH on the Pt surface. Constructing AAS that can enhance dual functionality simultaneously can be seen as a successful \u201ckill two birds with one stone\u201d strategy.<\/jats:p>","DOI":"10.1002\/smll.202308473","type":"journal-article","created":{"date-parts":[[2023,11,17]],"date-time":"2023-11-17T08:21:06Z","timestamp":1700209266000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Enhanced Activity of Small Pt Nanoparticles Decorated with High\u2010Loading Single Fe\u2500N<sub>4<\/sub> for Methanol Oxidation and Oxygen Reduction via the Assistive Active Sites Strategy"],"prefix":"10.1002","volume":"20","author":[{"given":"Wei","family":"Yan","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering China University of Petroleum (East China)  Qingdao 266580 P. R. 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