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Moreover, conventional alloying or intermetallic ordering strategies often aggravate these issues by inducing severe nanoparticle aggregation and instability. Here we report a controllable alloying\u2013dealloying strategy to construct PtNi nanoparticles confined in an N\u2010doped carbon framework (Pt\n                    <jats:sub>1<\/jats:sub>\n                    Ni\n                    <jats:sub>1\u2010x<\/jats:sub>\n                    @Ni\n                    <jats:sub>x<\/jats:sub>\n                    _NC). Ammonia\u2010assisted dealloying produces a Pt\u2010rich shell with an alloyed core, while the N\u2010doped carbon anchors the released Ni atoms form Ni\u2013N\/C moieties, thereby suppressing agglomeration and strengthening metal\u2013support interactions. This coordination\u2013support coupling optimizes Pt 5d orbital occupation, weakens oxygen adsorption, and accelerates ORR kinetics. Consequently, Pt\n                    <jats:sub>1<\/jats:sub>\n                    Ni\n                    <jats:sub>1\u2010x<\/jats:sub>\n                    @Ni\n                    <jats:sub>x<\/jats:sub>\n                    _NC exhibits a half\u2010wave potential of 0.932\u00a0V and an ultrahigh mass activity of 2.028 A mgPt\n                    <jats:sup>\u22121<\/jats:sup>\n                    , which is 8.75\u2010fold higher than commercial Pt\/C and among the best values reported to date for PtNi\u2010based catalysts. Remarkably, it shows only a 6\u00a0mV half\u2010wave potential loss after 30,000 cycles, demonstrating exceptional durability. In PEMFCs, the fuel cell delivers 975\u00a0mW cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    peak power density and retains 91.9% of initial performance, underscoring a generalizable approach for designing durable, high\u2010performance low\u2010PGM catalysts for next generation PEMFCs.\n                  <\/jats:p>","DOI":"10.1002\/anie.4524344","type":"journal-article","created":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T04:58:48Z","timestamp":1770699528000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Harnessing Controlled Dealloying\u2013Support Coupling for Ultrastable PtNi Catalysts in PEMFC Applications"],"prefix":"10.1002","volume":"65","author":[{"given":"Fei","family":"Guo","sequence":"first","affiliation":[{"name":"Department of Chemistry University College London  London 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College London White City Campus  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zong","sequence":"additional","affiliation":[{"name":"Department of Chemistry University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianuo","family":"Chen","sequence":"additional","affiliation":[{"name":"Electrochemical Innovation Lab Department of Chemical Engineering University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qi","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Chemistry School of Physical and Chemical Sciences Queen Mary University of London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Chemistry School of Physical and Chemical Sciences Queen Mary University of London  London 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