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Here, we report an isoreticular series of nonionic covalent organic framework membranes with comparable one\u2010dimensional nanochannels but systematically varied pore\u2010wall oxygen chemistry. Hydroxyl\u2010substitution\u2010regulated hydrazone\u2010to\u2010\u03b2\u2010ketoenamine tautomerism generates carbonyl\u2010enriched BthTb\u20103OH nanochannels, which preferentially partition and transport cations while suppressing anion migration without relying on covalently anchored charges. Across diverse electrolytes, BthTb\u20103OH exhibits broadly cation\u2010favored transport, with particularly strong cation\/anion mobility contrasts in sulfate\u2010 and phosphate\u2010containing media. Experiments and molecular dynamics simulations further reveal that the carbonyl\u2010rich channels couple high K\n                    <jats:sup>+<\/jats:sup>\n                    permselectivity with rapid K\n                    <jats:sup>+<\/jats:sup>\n                    conduction under concentrated\u2010salt conditions. K\n                    <jats:sub>3<\/jats:sub>\n                    PO\n                    <jats:sub>4<\/jats:sub>\n                    preconditioning reorganizes the confined transport landscape through retained phosphate\/K\n                    <jats:sup>+<\/jats:sup>\n                    species within the carbonyl\u2010rich nanochannels, facilitating K\n                    <jats:sup>+<\/jats:sup>\n                    transport and amplifying thermodiffusive cation\/anion contrast in sulfate media. Consequently, the conditioned membrane delivers a peak power density of 224.2\u00a0W m\n                    <jats:sup>\u22122<\/jats:sup>\n                    in saturated K\n                    <jats:sub>2<\/jats:sub>\n                    SO\n                    <jats:sub>4<\/jats:sub>\n                    under a 50 K temperature difference, establishing nonionic COF nanochannels as a charge\u2010screening\u2010resistant platform for high\u2010salinity ionic thermoelectrics.\n                  <\/jats:p>","DOI":"10.1002\/anie.4046032","type":"journal-article","created":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T05:06:01Z","timestamp":1787979961000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carbonyl\u2010Enriched Nonionic Covalent Organic Framework Nanochannels for High\u2010Salinity Ionic Thermoelectrics"],"prefix":"10.1002","volume":"65","author":[{"given":"Huixia","family":"Lv","sequence":"first","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-4839-3759","authenticated-orcid":false,"given":"Zhiwei","family":"Xing","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuozhi","family":"Lai","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Guo","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kunkun","family":"Ren","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haitao","family":"Su","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaming","family":"Yi","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University  Hangzhou 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