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Although EC materials have evolved from transition metal oxides to ion\u2010based electrodeposition films, their commercialization remains hindered by high costs and complex manufacturing processes. This study introduces a symmetric electrochromic device (ECD) based on Zinc and Iodine electrodeposition\/dissolution, which demonstrates exceptional optical modulation performance. It features a minimalist structure consisting of two pristine TCO glass substrates sandwiching a single injected electrolyte without any pre\u2010deposited electrodes. The device achieves a high optical modulation window of approximately 85% at 600\u00a0nm, exhibits rapid response time (reaching 90% of coloring\/bleaching in just 4.7 s\/3.9 s), and, most importantly, retains structural integrity over 30\u00a0000 cycles, retaining approximately 70% of the initial optical modulation. In addition, a large\u2010area device (20 \u00d7 20 cm\n                    <jats:sup>2<\/jats:sup>\n                    ) exhibits excellent color uniformity, demonstrating outstanding scalability and marking a major breakthrough in the development of EC smart windows.\n                  <\/jats:p>","DOI":"10.1002\/smll.76024","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T16:55:12Z","timestamp":1790528112000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Scalable and Durable Symmetric Electrochromic Devices via Zinc\u2013Iodine Electrodeposition for Smart Window Applications"],"prefix":"10.1002","author":[{"given":"Xiaoying","family":"Ma","sequence":"first","affiliation":[{"name":"Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics College of Physics and Optoelectronic 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