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To address this issue, the study optimizes the coordination environment of cobalt (Co) sites by doping with boron (B), which exhibits Lewis acid activity, in cobalt boride (CoB) and nitrogen\u2010carbon (NC) assembled into a 2D CoB\/NC nanosheet. The obtained CoB\/NC\u20100.3(900,1) photocatalysts exhibit abundant Lewis acid sites, high CO<jats:sub>2<\/jats:sub> adsorption and activation abilities, and excellent photothermal catalytic activity. Impressively, CoB\/NC\u20100.3(900,1) shows high activity in the cycloaddition reaction of CO<jats:sub>2<\/jats:sub> with epichlorohydrin, yielding 98% chloropropene carbonate after 3 h under low CO<jats:sub>2<\/jats:sub> concentrations (Pco<jats:sub>2<\/jats:sub> = 0.15 bar), which is nine times higher than that of Co\/NC, highlighting its potential for practical application. Mechanism studies reveal that CoB\/NC\u20100.3(900,1) easily generates hot electrons upon light irradiation, which similarly promotes the formation of ring\u2010opening intermediates and enhances the activation of epoxides and CO<jats:sub>2<\/jats:sub>. This study not only offers novel perspectives on the synthesis of advanced 2D nanosheet catalysts for photothermal\u2010assisted CO<jats:sub>2<\/jats:sub> conversion into high\u2010value products but also provides broader insights into the rational design of catalysts for the photocatalytic conversion of diluted CO<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1002\/smll.202505872","type":"journal-article","created":{"date-parts":[[2025,8,14]],"date-time":"2025-08-14T12:08:26Z","timestamp":1755173306000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Ultrathin CoB\/NC Nanosheets for Efficient Photothermal Catalytic Cycloaddition of Diluted CO<sub>2<\/sub>: Boron Introduction Enhances Adsorption and Activation of CO<sub>2<\/sub>"],"prefix":"10.1002","volume":"21","author":[{"given":"Hong","family":"An","sequence":"first","affiliation":[{"name":"China\u2010Uzbekistan Joint Laboratory on Advanced Porous Materials Lab 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