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As the benchmark electrocatalyst for the oxygen evolution reaction (OER), conventional single\u2010phase IrO\n                    <jats:sub>2<\/jats:sub>\n                    is constrained by linear scaling relations among oxygenated intermediates, compounded by severe mass\u2010transport limitations and poorly regulated interfacial water structures. Here, we design a Turing\u2010type MoO\n                    <jats:sub>x<\/jats:sub>\n                    \u2010IrO\n                    <jats:sub>2<\/jats:sub>\n                    heterostructure with strongly coupled cluster\u2010scale interfaces, which enables dual\u2010function Ir\u2010Mo synergy that breaks fundamental kinetic limitations and optimizes interfacial water structures. At the reaction pathway level, Br\u00f8nsted\u2010acidic MoO\n                    <jats:sub>x<\/jats:sub>\n                    clusters promote water dissociation to generate reactive Mo\u2500OH* intermediates, triggering radical coupling with adjacent Ir\u2500O* species to form OOH* and thus circumventing the linear scaling relation. At the interfacial microenvironment level, MoO\n                    <jats:sub>x<\/jats:sub>\n                    reorganizes the rigid hydrogen\u2010bonding networks and increases the population of free H\n                    <jats:sub>2<\/jats:sub>\n                    O species, effectively alleviating concentration overpotentials under high\u2010current\u2010density operation. When integrated into a practical 25 cm\n                    <jats:sup>2<\/jats:sup>\n                    membrane electrode assembly, this catalyst delivers a PEMWE cell voltage of 1.71\u00a0V at 3 A\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and an ultralow degradation rate of \u223c9.5\u00a0\u00b5V\u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    over 1000\u00a0h, with a total platinum\u2010group\u2010metal loading of merely 0.5\u00a0mg\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    across both electrodes. Our dual\u2010modulation strategy establishes a transformative paradigm for developing low\u2010iridium and durable OER electrocatalysts toward practical green hydrogen production.\n                  <\/jats:p>","DOI":"10.1002\/anie.3499419","type":"journal-article","created":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T07:17:10Z","timestamp":1792826230000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cluster\u2010Scale MoO\n                    <sub>x<\/sub>\n                    \u2010IrO\n                    <sub>2<\/sub>\n                    Heterointerfaces Steer Dual\u2010Site Coupling and Interfacial Water Dynamics for Fast and Durable Oxygen Evolution"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6065-8853","authenticated-orcid":false,"given":"Xiaozhong","family":"Zheng","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Zhejiang 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7582-3744","authenticated-orcid":false,"given":"Hongge","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Zhejiang University  Hangzhou China"},{"name":"Institute of Science and Technology for New Energy Xi\u2019an Technological University  Xi\u2019an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3021-6382","authenticated-orcid":false,"given":"Wenping","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Zhejiang University  Hangzhou China"},{"name":"State Key Laboratory of Clean Energy Utilization Zhejiang University  Hangzhou China"},{"name":"Zhejiang Key Laboratory of Advanced Solid State Energy Storage Technology and Applications Taizhou Institute of Zhejiang University  Taizhou 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