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In this study, by coating amorphous ferric\u2010cobalt oxides (CoFeO)\u00a0on BP nanosheets, a multifunctional CoFeO@2D BP is successfully developed that effectively inhibited combustion and catalyzed CO oxidation to eliminate toxic gases. Strong affinity between transition\u2010metal cations and BP allowed the uniform growth of amorphous ferric\u2012cobalt oxides on the BP surface, which effectively prevented the spontaneous degradation of 2D BP. By combining CoFeO@2D BP with gelatin and kosmotropic salts, the as\u2010obtained nanocoatings are used for surface treatment of flammable polyurethane foam (PU). Kosmotropic ions induced strong hydrophobic interactions and bundling within the gelatin chains which significantly enhanced the mechanical performance of the PU. BP accelerates the carbonization of gelatin to inhibit the combustion of PU, and CoFe oxides, which act as true active centers to accelerate the oxidation of CO, effectively inhibiting the production of harmful gas. The release rate of CO decreases by 73% and the limiting oxygen index (LOI) increases from 17% to \u224832% during PU combustion. The developed novel 2D material opens the way for multifunctional coatings with integrated durability, flame retardancy, and high smoke suppression efficiency.<\/jats:p>","DOI":"10.1002\/smll.202407060","type":"journal-article","created":{"date-parts":[[2024,10,10]],"date-time":"2024-10-10T13:38:17Z","timestamp":1728567497000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["CoFe Oxides\u2010Coated 2D Black Phosphorus for Flame\u2010Retardant Nanocoatings with Tunable Mechanical Strength and Efficient Elimination of Toxic Gases"],"prefix":"10.1002","volume":"20","author":[{"given":"Xiaoyang","family":"Yu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Fire Science University of Science and Technology of China  Hefei 230026 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huan","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Fire Science 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