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Although ethylene (C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    ), a major CO\n                    <jats:sub>2<\/jats:sub>\n                    electroreduction product, may serve as a potential alternative for the coupling and carbon\u2010chain elongation, the efficient C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    oxidation under ambient conditions and selective control of the oxidation level still represent two main bottlenecks for realizing long\u2010chain products. Herein, we demonstrate an efficient tandem electrochemical approach for synthesizing polyglycolic acid (PGA) from CO\n                    <jats:sub>2<\/jats:sub>\n                    via the bromine\u2010assisted C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    oxidation, followed by polymerization under mild conditions. This process is enabled by the temperature\u2010mediated electro\u2010oxidation of C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    to bromoacetate, which overcomes the diffusion limitation imposed by the electrical double layer at room temperature. The resulting bromoacetate with\n                    <jats:italic>sp<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    \u2010hybridized carbon preferentially undergoes intermolecular nucleophilic attack, thus driving polymerization to PGA. This work presents a potential approach for converting CO\n                    <jats:sub>2<\/jats:sub>\n                    to biodegradable polyesters.\n                  <\/jats:p>","DOI":"10.1002\/smll.74880","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T09:02:25Z","timestamp":1785229345000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Electrocatalytic CO\n                    <sub>2<\/sub>\n                    Upgrading to Biodegradable Plastic by Bromine\u2010Assisted C\n                    <sub>2<\/sub>\n                    H\n                    <sub>4<\/sub>\n                    Oxidation and Polymerization"],"prefix":"10.1002","volume":"22","author":[{"given":"Maoyin","family":"Wang","sequence":"first","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Wang","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengqiu","family":"Xu","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhang","family":"Huang","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruilin","family":"Wei","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hairui","family":"Ma","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boyu","family":"Hou","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-6961-7196","authenticated-orcid":false,"given":"Cejun","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Fuzhou University  Fujian China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangyong","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Porous Materials for Separation and Conversion Southwest Research &amp; Design Institute of the Chemical Industry  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuya","family":"Hao","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1803-6955","authenticated-orcid":false,"given":"Gengfeng","family":"Zheng","sequence":"additional","affiliation":[{"name":"Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Shanghai Academy of Natural Sciences Fudan University  Shanghai 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