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Here, we report a lutetium\u2010stabilized cobalt oxide catalyst (Lu\n                    <jats:sub>0.08<\/jats:sub>\n                    Co\n                    <jats:sub>2.92<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    ) designed through site\u2010specific electronic modulation, achieving a synergistic enhancement of both activity and stability in acidic OER for proton exchange membrane water electrolyzers (PEMWEs). Operando spectroscopies combined with theoretical simulations reveal that Lu incorporation introduces robust Lu\u2010O bonds and induces charge redistribution that strengthens Co\u2010O covalency and suppresses Co\n                    <jats:sup>2+<\/jats:sup>\n                    dissolution, which is critical for improved OER durability, and simultaneously optimizes the Co\u2010Co distance to favor direct O\u2010O radical coupling with a reduced energy barrier. Leveraging these structural advantages, a practical PEMWE employing Lu\n                    <jats:sub>0.08<\/jats:sub>\n                    Co\n                    <jats:sub>2.92<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    delivers an industrially relevant current density of 1000\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.837\u00a0V. Separately, it maintains stable operation for over 900 h under a stepwise current density from 200 to 500\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , highlighting its potential for sustainable hydrogen production.\n                  <\/jats:p>","DOI":"10.1002\/adma.75413","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T08:00:08Z","timestamp":1791964808000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pathway Engineering Enables Durable Iridium\u2010Free Acidic Water Oxidation"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3448-6462","authenticated-orcid":false,"given":"Feng","family":"Cao","sequence":"first","affiliation":[{"name":"Center of Hydrogen Science School of Materials Science and Engineering Shanghai Jiao Tong University  Shanghai China"},{"name":"Zhangjiang Institute for Advanced Study Shanghai 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