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Their deployment, however, is limited by uneven Zn deposition, water\u2010driven hydrogen evolution and corrosion, and polyiodide shuttling. Functional hydrogel electrolytes can regulate these coupled processes through solvent confinement, ion\u2010selective transport, and mechanically persistent electrode contact. This review critically examines recent advances in hydrogel electrolytes for Zn\u2013I\n                    <jats:sub>2<\/jats:sub>\n                    batteries from interfacial chemistry to architectural engineering. Distinct from broader hydrogel reviews for aqueous Zn batteries, it focuses on the chemically asymmetric coupling between a water\u2010reactive Zn anode and a soluble polyiodide cathode and organizes the field through a structure\u2013mechanism\u2013performance framework that links molecular affinity, fixed charge, and water\u2010state regulation to measurable interfacial parameters, spatially decoupled architectures, and scale\u2010relevant device metrics. We analyze dual\u2010interface regulation across solvation and nucleation, polyiodide confinement, tortuosity control, and asymmetric\/Janus structures. Broad\u2010temperature and voltage\u2010tolerant operation, together with self\u2010healing, self\u2010sensing, and biosensing functions, is also evaluated. Finally, we distinguish materials\u2010level evidence from pouch\u2010 and Ah\u2010level validation and propose an application\u2010specific roadmap centered on high iodine loading, lean electrolyte, limited Zn inventory, water retention, and scalable manufacturing.\n                  <\/jats:p>","DOI":"10.1002\/adma.74570","type":"journal-article","created":{"date-parts":[[2026,8,11]],"date-time":"2026-08-11T06:09:23Z","timestamp":1786428563000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Bridging the Gap to Practical Aqueous Zinc\u2013Iodine Batteries: Advanced Hydrogel Electrolytes via Interfacial Chemistry and Architectural Engineering"],"prefix":"10.1002","volume":"38","author":[{"given":"Qiugang","family":"Liao","sequence":"first","affiliation":[{"name":"Institute of Special Materials and Technology Fudan University  Shanghai P. R. 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