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However, this endeavor is often hampered by a fundamental trade\u2010off: weak metal\u2010promoter interactions (MPI) lead to promoter segregation, while excessively strong ones block active sites, both diminishing the efficiency of promotion. In this work, we report a high\u2010entropy oxide (HEO) nanoparticle catalyst integrated with active metals (Ru\/Co) and promoters (La\/Ce\/Sm) for efficient NH\n                    <jats:sub>3<\/jats:sub>\n                    synthesis via an in situ reconstruction strategy. Our investigation reveals that the HEO undergoes in situ reconstruction to form RuCo nanoalloys anchored on rare\u2010earth oxide nanoislands, which simultaneously realizes the exposure of active sites and strong metal\u2010promoter interaction. This entropy reduction process facilitates the formation of surface oxygen vacancy sites with low work function electrons, facilitating electron transfer to the metal alloys to drive N\n                    <jats:sub>2<\/jats:sub>\n                    dissociation. Furthermore, alloying Ru with Co metal lowers the d\u2010band center to promote NH\n                    <jats:sub>3<\/jats:sub>\n                    desorption. Consequently, the optimized RuCo\u2010HEO catalyst delivers a remarkable NH\n                    <jats:sub>3<\/jats:sub>\n                    synthesis rate of 58.2\u00a0mmol g\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    h\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    (2.41% concentration) at 400\u00b0C and 1\u00a0MPa, approaching the thermodynamic equilibrium value (2.44%). This work provides an in situ reconstruction strategy to engineer active sites exposure and promoter effect for efficient green NH\n                    <jats:sub>3<\/jats:sub>\n                    synthesis.\n                  <\/jats:p>","DOI":"10.1002\/anie.9715444","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T14:15:03Z","timestamp":1787148903000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["RuCo Nanoalloy Catalysts Obtained From In\u2010Situ Reconstruction of High\u2010Entropy Oxides for Green Ammonia Synthesis"],"prefix":"10.1002","volume":"65","author":[{"given":"Xiuyun","family":"Wang","sequence":"first","affiliation":[{"name":"National Engineering Research Center of Chemical Fertilizer Catalyst State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Fuzhou University  Fujian 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Research Hub Cardiff University  Cardiff UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lirong","family":"Zheng","sequence":"additional","affiliation":[{"name":"Institute of High Energy Physics Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6428-2233","authenticated-orcid":false,"given":"Junjie","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University  Xi'an Shaanxi China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0081-0367","authenticated-orcid":false,"given":"Lilong","family":"Jiang","sequence":"additional","affiliation":[{"name":"National Engineering Research Center of Chemical Fertilizer Catalyst State Key Laboratory of Fluorine &amp; Nitrogen Chemicals Fuzhou University  Fujian 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