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However, their practical performance in zinc\u2010air batteries (ZABs) is hindered by low active site utilization efficiency and excessively strong adsorption of ORR intermediates. Herein, we fabricate a catalyst featuring atomically dispersed Fe and Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanoparticles anchored on large\u2010scale two\u2010dimensional (2D) carbon nanosheets via pyrolysis of MOF superstructure precursors. A dual Fe\u2010source strategy enhances Fe\/N contents while creating abundant Fe\u2010N\n                    <jats:sub>x<\/jats:sub>\n                    and N\u2010doped carbon active sites. Experimental and theoretical results reveal that the 2D nanosheet architecture provides high O\n                    <jats:sub>2<\/jats:sub>\n                    storage capacity and rapid mass transfer channels, significantly improving Fe\u2010N\n                    <jats:sub>x<\/jats:sub>\n                    site utilization. Meanwhile, Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    modulates Fe's d\u2010p orbital hybridization and enhances outermost electron delocalization, weakening excessive binding of ORR intermediates. Consequently, the Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/Fe\u2010N\u2010C nanosheet catalyst demonstrates superior ORR performance and enhanced ZABs performance compared to conventional Fe\u2010N\u2010C nanoparticle catalysts. This study offers new insights into developing high\u2010performance ORR catalysts through synergistic optimization of single\u2010atom active site electronic structures and support architecture.\n                  <\/jats:p>","DOI":"10.1002\/smtd.71105","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T05:59:47Z","timestamp":1791439187000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["MOF\u2010Superstructure\u2010Derived 2D Fe\n                    <sub>2<\/sub>\n                    O\n                    <sub>3<\/sub>\n                    \/Fe\u2010N\u2010C Nanosheets as Catalysts for Zn\u2010Air Batteries: Synergistically Enhanced Mass Transport and Electrocatalytic Activity"],"prefix":"10.1002","author":[{"given":"Zihan","family":"Wang","sequence":"first","affiliation":[{"name":"College of Chesmistry and Chemical Engineering Taiyuan University of Technology  Taiyuan 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