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Here, we report a class of low\u2010valent RuIr oxide nanocatalysts that simultaneously achieve high OER activity and durability. Through an ethylene glycol\u2010mediated reduction, the conventional RuIr oxide framework with metals in tetravalent oxidation states is transformed into a distorted monoclinic structure in which Ru and Ir are stabilized at reduced valence states below +4. A combination of in situ spectroscopies and isotope\u2010tracing mass spectrometry reveals a dynamic yet structurally robust behavior of the chemically reduced catalyst. During OER, Ru and Ir undergo reversible valence changes and recover after potential relaxation, while the oxide framework remains unchanged and the catalyst follows the adsorbate evolution mechanism. In a PEMWE cell, the optimal catalyst achieves current densities of 1.0 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.61\u00a0V and 2.0 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.74\u00a0V, with low degradation rates over 2000\u00a0h for each current density, and retains more than 94% of its initial activity after 40\u00a0000 dynamic voltage cycles. The low\u2010valent strategy, with dynamic adaptability and structural robustness, offers an efficient design principle for high\u2010performance RuIr\u2010based catalysts.\n                  <\/jats:p>","DOI":"10.1002\/adma.74362","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T12:05:16Z","timestamp":1785240316000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Low\u2010Valent RuIr Oxide With Reversible Valence Dynamics and Robust Framework for Oxygen Evolution Electrocatalysis"],"prefix":"10.1002","volume":"38","author":[{"given":"Yucheng","family":"Shen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchang","family":"Hou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5574-4475","authenticated-orcid":false,"given":"Kun","family":"Qi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences  Dalian China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingcheng","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"An","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences  Dalian China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8183-8205","authenticated-orcid":false,"given":"Xiao","family":"Zhao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Automobile Materials of MOE School of Materials Science and Engineering Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deqiang","family":"Yuan","sequence":"additional","affiliation":[{"name":"CRRC Changchun Railway Vehicles Co., Ltd.  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