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Nevertheless, their practical application is still hampered by the dissolution and shuttling of soluble polyiodides, leading to rapid capacity decay and inferior cycling stability. Although porous carbon\u2010based host materials physically confine iodine species, thereby improving electrochemical performance, the crucial role of surface functional groups on carbon (\u2500OH, \u2500C\u2550O, and \u2500COOH) in regulating the electrochemical behavior has been neglected. Herein, we designed and synthesized hierarchical micro\u2010mesoporous carbon (MMC) nanospheres rich with hydroxyl (\u2500OH) and carbonyl (\u2500C\u2550O) groups as iodine hosts. The multiscale porous structure facilitates high iodine loading, while \u2500OH groups remarkably enhance the chemical adsorption of iodine species via O\u2500H\u2219\u2219\u2219I bond, thereby suppress the shuttle effect. Additionally, \u2500C\u2550O groups actively participate in additional Faradaic redox reactions. Consequently, the prepared I\n                    <jats:sub>2<\/jats:sub>\n                    \/MMC\u2010Rich electrode delivers outstanding electrochemical performance: it provides an initial capacity of 160.87 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 10 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    and maintains 135.58 mAh g\n                    <jats:sup>\u22121<\/jats:sup>\n                    after 25\u00a0000 cycles, with a capacity retention rate of 84%. This work offers a rational strategy for developing functional carbon materials toward high\u2010performance and long\u2010life Zn\u2010I\n                    <jats:sub>2<\/jats:sub>\n                    batteries.\n                  <\/jats:p>","DOI":"10.1002\/smll.202600044","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T10:27:52Z","timestamp":1770200872000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Engineering Bifunctional Carbon Hosts with Rich \u2500OH and \u2500C\u2550O for Synergistic Confinement and Redox Kinetics in Zn\u2010I\n                    <sub>2<\/sub>\n                    Batteries"],"prefix":"10.1002","volume":"22","author":[{"given":"Siyu","family":"Liu","sequence":"first","affiliation":[{"name":"College of Resources and Environment Jilin Agricultural University  Changchun P. R. 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