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Here we report a strategy to resolve this problem by introducing tensile strain in a copper (Cu) catalyst, which can selectively reduce CO<jats:sub>2<\/jats:sub> to valuable multicarbon products, particularly ethylene, in a pH\u20051 electrolyte with 1\u2005M potassium ions. We find that the tension\u2010strained Cu creates an electron\u2010rich surface that concentrates diluted potassium ions, contributing to CO<jats:sub>2<\/jats:sub> activation and HER suppression. With this catalyst, we show constant ethylene Faradaic efficiency (FE) of 44.3\u2009% over 100\u2005hours at 400\u2005mA\u2009cm<jats:sup>\u22122<\/jats:sup> and a cell voltage of 3.1 volts in a proton\u2010exchange membrane electrolyser. Moreover, selective electrosynthesis of ethylene oxide using the as\u2010produced ethylene was demonstrated in an integrated system.<\/jats:p>","DOI":"10.1002\/anie.202422054","type":"journal-article","created":{"date-parts":[[2025,1,14]],"date-time":"2025-01-14T08:11:23Z","timestamp":1736842283000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Highly Tension\u2010Strained Copper Concentrates Diluted Cations for Selective Proton\u2010Exchange Membrane CO<sub>2<\/sub> Electrolysis"],"prefix":"10.1002","volume":"64","author":[{"given":"Ye\u2010Cheng","family":"Li","sequence":"first","affiliation":[{"name":"Division of Nanomaterials &amp; Chemistry, Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China, 230026  Hefei China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao\u2010Long","family":"Zhang","sequence":"additional","affiliation":[{"name":"Division of Nanomaterials &amp; Chemistry, Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China, 230026  Hefei China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao\u2010Lin","family":"Tai","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Science and Technology of China  Hefei 230026 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue\u2010Peng","family":"Yang","sequence":"additional","affiliation":[{"name":"Division of Nanomaterials &amp; Chemistry, Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China, 230026  Hefei China"},{"name":"School of Materials Science and Engineering, Anhui University  Hefei, Anhui 230601 P. 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