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However, the practical application of conventional benzene\u2010rich COF skeletons is often limited by their weak oxygen adsorption capacity and inefficient charge carrier transport. To address these challenges, we report a universal post\u2010synthetic strategy that incorporates local, electron\u2010deficient polar single\u2010molecule junctions into the COF framework via a straightforward one\u2010step modification. These engineered junctions play a dual role: the localized electron\u2010deficient sites strongly anchor and activate oxygen molecules, while the in\u2010built polarity establishes directional channels for the migration of photogenerated charge carriers, ensuring their precise delivery to active sites. This synergistic mechanism leads to a marked enhancement in superoxide radical generation and the subsequent synthesis of H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    . Under acidic conditions (pH = 3), the H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    generation rate of the monomolecularly\u2010linked COF reached 4354\u00a0\u00b5mol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    , significantly higher than the 1655\u00a0\u00b5mol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    of the pristine COF. The broad applicability of this design principle was firmly established through the successful implementation of a series of tailor\u2010made analogous molecules across several distinct COF platforms.\n                  <\/jats:p>","DOI":"10.1002\/adma.73233","type":"journal-article","created":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T06:49:14Z","timestamp":1777531754000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Electron\u2010Deficient Single\u2010Molecule\u2010Junction Sites in COFs Enable H\n                    <sub>2<\/sub>\n                    O\n                    <sub>2<\/sub>\n                    Photosynthesis via Precision Charge Delivery and Oxygen Adsorption"],"prefix":"10.1002","volume":"38","author":[{"given":"Yuhao","family":"Yan","sequence":"first","affiliation":[{"name":"Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Chemical Engineering South China Agricultural University  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rongchen","family":"Shen","sequence":"additional","affiliation":[{"name":"Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Chemical Engineering South China Agricultural University  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Qi","sequence":"additional","affiliation":[{"name":"Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Chemical Engineering South China Agricultural University  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Can","family":"Huang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Chemical Engineering South China Agricultural University  Guangzhou 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