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Although organic polymer photocatalysts show great potential for NO\n                    <jats:sub>3<\/jats:sub>\n                    RR, they frequently suffer from low charge separation efficiency. This limitation largely comes from the lack of suitable redox\u2010active moieties incorporated in the polymer photocatalysts toward NO\n                    <jats:sub>3<\/jats:sub>\n                    RR. Herein, we embed the redox\u2010active Eosin Y (EY) into a conjugated polymer backbone to synthesize a series of EY\u2013X polymers (where X = benzene, biphenyl, or fluorene), in which the extended \u03c0\u2010conjugation can promote dual dynamic and static quenching for directional electron transfer. Upon visible\u2010light excitation, EY forms a long\u2010lived radical anion (EY\n                    <jats:sup>\u2022\u2212<\/jats:sup>\n                    ) that stores and relays electrons to nitrate, while ground\u2010state complexation between polymer and nitrate preorganizes the substrate for photoinduced directional electron transfer. This dual\u2010pathway mechanism extends charge\u2010separated lifetimes, inhibits recombination, and enhances electron delivery. Consequently, under cocatalyst\u2010free conditions, the EY\u2013BE polymer achieves a record high NH\n                    <jats:sub>3<\/jats:sub>\n                    production of 215\u00a0\u00b5mol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Experimental and computational investigations support the reversible EY\/EY\n                    <jats:sup>\u2022\u2212<\/jats:sup>\n                    cycle and the nitrate\u2010binding ground\u2010state complex as the origin of activity and selectivity. This work demonstrates a rational strategy leveraging reversible redox\u2010active chromophores to integrate dual quenching for designing high\u2010performance NO\n                    <jats:sub>3<\/jats:sub>\n                    RR photocatalysts.\n                  <\/jats:p>","DOI":"10.1002\/adma.73686","type":"journal-article","created":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T06:25:01Z","timestamp":1781245501000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Dual\u2010Quenching Charge Transfer Unlocks Record Nitrate\u2010to\u2010Ammonia Photocatalytic Conversion in Redox\u2010Active Eosin Y Polymers"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-4566-9031","authenticated-orcid":false,"given":"Jiayi","family":"Zhang","sequence":"first","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dingming","family":"Chen","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Limei","family":"Tian","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shufan","family":"Feng","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai China"},{"name":"Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry School of Science and Research Center for Industries of the Future Westlake University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihan","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiwu","family":"Yu","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize 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