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Conventional diaphragm\u2010type porous membranes have a high risk of explosion owing to their high gas crossover, while nonporous anion exchange membranes lack mechanical and thermochemical stability, limiting their practical application. Herein, a thin film composite (TFC) membrane is proposed as a new category of AWE membranes. The TFC membrane consists of an ultrathin quaternary ammonium (QA) selective layer formed via Menshutkin reaction\u2010based interfacial polymerization on a porous polyethylene (PE) support. The dense, alkaline\u2010stable, and highly anion\u2010conductive QA layer prevents gas crossover while promoting anion transport. The PE support reinforces the mechanical and thermochemical properties, while its highly porous and thin structure reduces mass transport resistance across the TFC membrane. Consequently, the TFC membrane exhibits unprecedentedly high AWE performance (1.16 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.8\u00a0V) using nonprecious group metal electrodes with a potassium hydroxide (25\u00a0wt%) aqueous solution at 80\u00a0\u00b0C, significantly outperforming commercial and other lab\u2010made AWE membranes. Moreover, the TFC membrane demonstrates remarkably low gas crossover, long\u2010term stability, and stack cell operability, thereby ensuring its commercial viability for green H\n                    <jats:sub>2<\/jats:sub>\n                    production. This strategy provides an advanced material platform for energy and environmental applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.202300825","type":"journal-article","created":{"date-parts":[[2023,5,26]],"date-time":"2023-05-26T00:18:53Z","timestamp":1685060333000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":73,"title":["Thin Film Composite Membranes as a New Category of Alkaline Water Electrolysis Membranes"],"prefix":"10.1002","volume":"19","author":[{"given":"Juyeon","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hansoo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 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Advanced Materials Division Korea Research Institute of Chemical Technology (KRICT)  141 Gajeong\u2010ro, Yuseong\u2010gu Daejeon 34114 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hosik","family":"Park","sequence":"additional","affiliation":[{"name":"Center for Membranes Advanced Materials Division Korea Research Institute of Chemical Technology (KRICT)  141 Gajeong\u2010ro, Yuseong\u2010gu Daejeon 34114 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert S.","family":"Lee","sequence":"additional","affiliation":[{"name":"Materials Architecturing Research Center Korea Institute of Science and Technology (KIST)  5 Hwarang\u2010ro 14\u2010gil Seongbuk\u2010gu Seoul 02792 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changsoo","family":"Lee","sequence":"additional","affiliation":[{"name":"Hydrogen Research Department Korea Institute of Energy Research (KIER)  152 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