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In this work, we developed a novel Salt\u2010regulated confinement loading method to prepare amorphous Mn\n                    <jats:sub>3<\/jats:sub>\n                    CoO\n                    <jats:sub>x<\/jats:sub>\n                    support confined FeO microcrystallites at a relatively low\u2010temperature (623\u00a0K). The confined FeO microcrystallites showed strong interfacial electronic interactions with Mn\n                    <jats:sub>3<\/jats:sub>\n                    CoO\n                    <jats:sub>x<\/jats:sub>\n                    matrix (abundant defect sites and flexible local environments), enabling efficient charge transfer and enhanced intermediate stabilization for efficient OER in acidic media. The FeO\/Mn\n                    <jats:sub>3<\/jats:sub>\n                    CoO\n                    <jats:sub>x<\/jats:sub>\n                    exhibits remarkable OER performance, with a low overpotential of 252\u00a0mV@10\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    with a significantly lower Tafel slope\u00a0of\u00a079\u00a0mV dec\n                    <jats:sup>\u22121<\/jats:sup>\n                    , outperforming the commercial IrO\n                    <jats:sub>2<\/jats:sub>\n                    \u00a0(\u223c\u00a0290 mV@10\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    ). Mechanistic studies reveal that the incorporation of FeO microcrystallites, as electron reservoirs to stabilize high\u2010valence intermediates and facilitate continuous turnover, induces a synergistic transition from a purely lattice oxygen\u2010mediated mechanism (LOM) to a dual LOM and oxygen pathway mechanism (OPM).These results are well corroborated by in situ attenuated total reflection surface\u2010enhanced infrared spectroscopy, differential electrochemical mass spectrometry, and density functional theory calculations. Our work provides a robust strategy to design amorphous, non\u2010precious\u2010metal OER catalysts capable of stable operation in acidic media, offering a scalable route toward efficient hydrogen production.\n                  <\/jats:p>","DOI":"10.1002\/anie.202523620","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T22:15:35Z","timestamp":1773008135000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Salt\u2010Regulated Confinement of FeO Microcrystallites on Amorphous Mn\n                    <sub>3<\/sub>\n                    CoO\n                    <sub>x<\/sub>\n                    for Boosting Sustainable Acidic Water Oxidation"],"prefix":"10.1002","volume":"65","author":[{"given":"Qiong","family":"Zeng","sequence":"first","affiliation":[{"name":"University of Science and Technology of China  Hefei China"},{"name":"School of Chemistry and Chemical Engineering Inner 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