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Copper (Cu) is recognized as the only element capable of electro\u2010reducing CO<jats:sub>2<\/jats:sub> into hydrocarbons with two or more carbon atoms (C<jats:sub>2+<\/jats:sub>), but the low product selectivity of the Cu\u2010based catalyst remains a major technological challenge to overcome. Therefore, identification of the structural features of Cu\u2010based catalysts is of great importance for the highly selective production of C<jats:sub>2+<\/jats:sub> products (ethylene, ethanol, n\u2010propanol, etc.), and the oxidation state of Cu species in the catalysts is found critical to the catalyst performance. This review introduces recent efforts to fine\u2010tune the oxidation state of Cu to increase carbon capture and produce specific C<jats:sub>2+<\/jats:sub> compounds, with the intention of greatly expediting the advance in the catalyst designs. It also points to the remaining challenges and fruitful research directions for the development of Cu\u2010based catalysts that can shape the practical CO<jats:sub>2<\/jats:sub> reduction technology.<\/jats:p>","DOI":"10.1002\/adma.202313028","type":"journal-article","created":{"date-parts":[[2024,2,12]],"date-time":"2024-02-12T16:53:30Z","timestamp":1707756810000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":128,"title":["Strategies to Modulate the Copper Oxidation State Toward Selective C<sub>2+<\/sub> Production in the Electrochemical CO<sub>2<\/sub> Reduction Reaction"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4592-4819","authenticated-orcid":false,"given":"Minki","family":"Jun","sequence":"first","affiliation":[{"name":"Department of Chemistry and Research Institute for Natural Sciences Korea University  Seoul 02841 Republic of 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