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Adv."],"published-print":{"date-parts":[[2026,5,15]]},"abstract":"<jats:p>\n                    Tandem carbon dioxide reduction reaction (CO\n                    <jats:sub>2<\/jats:sub>\n                    RR) to multicarbon products (CO\n                    <jats:sub>2<\/jats:sub>\n                    -CO-C\n                    <jats:sub>2+<\/jats:sub>\n                    ) such as ethylene represents a pivotal strategy for carbon valorization. However, conventional alkaline or neutral tandem systems limit the carbon dioxide utilization and stability due to severe (bi)carbonate formation. Here, we design a durable acidic-alkaline tandem system to efficiently synthesize C\n                    <jats:sub>2+<\/jats:sub>\n                    products, especially ethylene. In the acidic CO\n                    <jats:sub>2<\/jats:sub>\n                    RR step, a catalyst with precisely controlled metal site distance was used to regulate *COOH adsorption. Typically, a 99.7\u00a0\u00b1\u00a00.4% carbon monoxide Faradaic efficiency (FE) at 1.4 amperes per square centimeter can be achieved using a catalyst with 0.5-nanometer nickel sites, surpassing the previously reported metal catalysts. When this catalyst was integrated into the acidic-alkaline tandem system and coupled with the alkaline carbon monoxide electroreduction, the ethylene and C\n                    <jats:sub>2+<\/jats:sub>\n                    FE reached 75.3\u00a0\u00b1\u00a01.2 and 92.5\u00a0\u00b1\u00a01.3% at 10 amperes, respectively, and remained stable for 400 hours. Our work provides solutions for the durable conversion of carbon dioxide to C\n                    <jats:sub>2+<\/jats:sub>\n                    products from catalyst and electrolyzer design.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aea2538","type":"journal-article","created":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T18:00:56Z","timestamp":1778695256000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":3,"title":["Acidic-alkaline tandem system for durable CO\n                    <sub>2<\/sub>\n                    -CO-C\n                    <sub>2+<\/sub>"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-7704-9642","authenticated-orcid":true,"given":"Xianhui","family":"Ma","sequence":"first","affiliation":[{"name":"Key Laboratory of Precision and Intelligent Chemistry\/School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China."},{"name":"Deep Space Exploration Laboratory, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-9594-005X","authenticated-orcid":true,"given":"Juan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dayin","family":"He","sequence":"additional","affiliation":[{"name":"Key Laboratory of Precision and Intelligent Chemistry\/School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China."},{"name":"Deep Space Exploration Laboratory, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Jiang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Precision and Intelligent Chemistry\/School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China."},{"name":"Deep Space Exploration Laboratory, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanhua","family":"Sun","sequence":"additional","affiliation":[{"name":"National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayi","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Rare Earths, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cai","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Carbon Neutrality, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5333-511X","authenticated-orcid":true,"given":"Yue","family":"Lin","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8699-8294","authenticated-orcid":true,"given":"Tao","family":"Yao","sequence":"additional","affiliation":[{"name":"National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-9202-5349","authenticated-orcid":true,"given":"Huang","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Precision and Intelligent Chemistry\/School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China."},{"name":"Deep Space Exploration Laboratory, University of Science and Technology of China, Hefei 230026, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6136-863X","authenticated-orcid":true,"given":"Yafei","family":"Li","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, 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