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However, most organic electrodes that use aliphatic backbones are nondegradable, leading to unsustainability when active sites fail. In this study, a poly(aspartic acid) polypeptide (PASP) with amide links in the backbone and nitroxide radical pendant groups in the side chains is synthesized by modifying the polypeptides with 4\u2010amino\u20102,2,6,6\u2010tetramethylpiperidine. In combination with a Zn anode, the PASP\u2010TEMPO composite electrode exhibits rapid charge\u2013discharge and superior cycling stability with reversible two\u2010electron redox reaction in aqueous electrolyte. The Zn\/PASP\u2010TEMPO organic radical battery delivers a discharge capacity of around 80\u2005mAh\u2009g<jats:sup>\u22121<\/jats:sup> by two\u2010electron reaction and charge\u2013discharge rates of up to 18\u2005A\u2009g<jats:sup>\u22121<\/jats:sup>. Because the redox reaction process of the nitroxyl radical turning into oxoammonium follows a p\u2010type mechanism that interacts with an anion, three electrolytes with different anions are tested in the Zn\/PASP\u2010TEMPO organic radical battery. Experimental results indicate that discharge plateau voltage is tunable by choosing different zinc salts as electrolytes. Capacity retention of up to 97.4\u2009% after 500\u2005cycles is realized in 1\u2005<jats:sc>m<\/jats:sc> ZnClO<jats:sub>4<\/jats:sub> electrolyte, which can be attributed to the adjacent reaction potentials of the two\u2010step one\u2010electron reaction.<\/jats:p>","DOI":"10.1002\/cssc.202102710","type":"journal-article","created":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T22:18:23Z","timestamp":1645481903000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Polypeptide Radical Cathode for Aqueous Zn\u2010Ion Battery with Two\u2010Electron Storage and Faster Charging Rate"],"prefix":"10.1002","volume":"15","author":[{"given":"Yongqi","family":"Deng","sequence":"first","affiliation":[{"name":"Department of Chemical Physics University of Science and Technology of China  Hefei 230026 P. R. 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