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In this work, we propose a novel topochemical design of introducing an electron buffer (EB) to control the electron stream when working, which efficiently attenuates the electron flow toward the water\u2010splitting reactions at the voltage ends. Careful measurements confirm the sharp reduction of current density applied for water\u2010splitting due to the EB effect. Theoretical calculations for voltage end verify the lower surface electron density of EB\u2010involved electrode than that of EB\u2010excluded electrode, demonstrating the superiority of this EB design in suppressing charge shock for water splitting. Consequently, the charging\/discharging plateau of the assembled SABs based on EB increases \u223c0.16\u00a0V, as well as a high capacity of 80.7\u00a0mA h g\n                    <jats:sup>\u22121<\/jats:sup>\n                    achieved, which is superior to reported state\u2010of\u2010the\u2010art aqueous bipolar materials. Moreover, the electrolyte loss of EB\u2010involved SABs reduces to only 24% of that of EB\u2010excluded SABs, validating suppressed water splitting by confining the electron pathway. This work provides a new thought to guide electron stream through introducing a rational buffer layer, aiming at hindering water splitting while maintaining energy storage performance.\n                  <\/jats:p>","DOI":"10.1002\/anie.3350796","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T13:55:18Z","timestamp":1782136518000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Water\u2010Splitting\u2010Suppressed High\u2010Capacity Bipolar Electrodes Enabled by Topochemical Electron Buffering for Symmetric Aqueous Batteries"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9755-7635","authenticated-orcid":false,"given":"Tieqi","family":"Huang","sequence":"first","affiliation":[{"name":"Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical Engineering Central South University  Changsha 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