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Herein, we report a fluorenone\u2010containing COF, FO\u2010Tp, as an efficient photocatalyst for H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production, delivering a rate nearly ten times higher than that of fluorene\u2010based COF, highlighting the crucial contribution of fluorenone carbonyls to photocatalytic oxygen reduction. The fluorenone carbonyls facilitate photogenerated\u2010electron trapping and the formation of persistent electron\u2010rich radical states with ketyl radical\u2010anion\u2010like character, enabling FO\u2010Tp to maintain excellent H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production under alkaline conditions (AQY = 30.40%, pH = 13, at 400 nm) and in concentrated salt solutions. Extended fluorenone\u2010based COFs validate the generality of this active\u2010site design, reaching 2478.1 \u00b5mol\u00b7g\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    in pure water and up to 38.6 mmol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00b7h\n                    <jats:sup>\u22121<\/jats:sup>\n                    in a water\/benzyl alcohol biphasic system. Spectroscopic experiments and density functional theory calculations jointly confirm the reduced fluorenone carbonyl as a thermodynamically favored and generalizable electron\u2010accumulating active site for oxygen reduction to H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    . This work elucidates how the fluorenone carbonyl functions as a dynamic molecular active site and proposes a strategy for designing efficiently H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    \u2010producing COF photocatalysts by incorporating carbonyl activation.\n                  <\/jats:p>","DOI":"10.1002\/adma.75245","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T08:54:22Z","timestamp":1791449662000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carbonyl\u2010Site\u2010Mediated Oxygen Reduction in Fluorenone\u2010Based Covalent Organic Frameworks for Efficient Hydrogen Peroxide Photosynthesis"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-3157-9918","authenticated-orcid":false,"given":"Chang","family":"He","sequence":"first","affiliation":[{"name":"Institute 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