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However, efficient CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010to\u2010C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    conversion under strongly acidic conditions remains challenging because copper\u2010based catalysts suffer from severe corrosion and competitive hydrogen evolution reaction (HER). Herein, we report a nano\u2010confined\u2010channel\u2010modified copper catalyst fabricated through flash Joule heating\u2010driven rapid pyrolysis of waste polypropylene. The resulting graphitized carbon forms abundant nanoscale confined channels on the copper surface, creating a protective and microenvironment\u2010regulating interface that suppresses catalyst corrosion while maintaining accessible Cu active sites. As a result, the catalyst achieves a C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    Faradaic efficiency of 70% at 400 mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , while sustaining a total C\n                    <jats:sub>2<\/jats:sub>\n                    Faradaic efficiency exceeding 80% over 200\u2013700 mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    . Molecular dynamics simulations and in situ characterizations reveal that the nano\u2010confined carbon interface promotes local K\n                    <jats:sup>+<\/jats:sup>\n                    accumulation, enriches reaction intermediates, and establishes a locally high\u2010pH microenvironment, thereby suppressing the HER and favoring C\u2500C coupling during acidic CO\n                    <jats:sub>2<\/jats:sub>\n                    RR conditions. This work highlights nano\u2010confined carbon channels as an effective interfacial engineering strategy for acid\u2010tolerant CO\n                    <jats:sub>2<\/jats:sub>\n                    RR and provides a sustainable pathway for upcycling waste plastics into functional carbon modifiers for efficient CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010to\u2010C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    conversion.\n                  <\/jats:p>","DOI":"10.1002\/smll.75768","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T14:58:26Z","timestamp":1790175506000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Nano\u2010Confined Carbon Channels Enable Efficient Acidic CO\n                    <sub>2<\/sub>\n                    Electrolysis to Ethylene"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-2332-5085","authenticated-orcid":false,"given":"Xilei","family":"Ding","sequence":"first","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianhui","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shijie","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Electronics Science and Engineering National Laboratory of Solid State Microstructures Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zixu","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deen","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0333-7920","authenticated-orcid":false,"given":"Dongke","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon Materials School of Materials Science and Engineering Institute of Advanced Semiconductors Hangzhou Innovation Center Zhejiang University  Hangzhou Zhejiang China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingyuan","family":"Hao","sequence":"additional","affiliation":[{"name":"School of Electronics Science and Engineering National Laboratory of Solid State Microstructures Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zehui","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Electronics Science and Engineering National Laboratory of Solid State Microstructures Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7423-2723","authenticated-orcid":false,"given":"Sung\u2010Fu","family":"Hung","sequence":"additional","affiliation":[{"name":"Department of Applied Chemistry and Center for Emergent Functional Matter Science National Yang Ming Chiao Tung University  Hsinchu Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangbin","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongwei","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Microelectronics School of Physics Nantong University  Nantong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0469-9766","authenticated-orcid":false,"given":"Jun","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Electronics Science and Engineering National Laboratory of Solid State Microstructures Nanjing University  Nanjing China"},{"name":"School of Microelectronics School of Physics Nantong University  Nantong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1888-2171","authenticated-orcid":false,"given":"Hucheng","family":"Song","sequence":"additional","affiliation":[{"name":"School of Physics Nanjing University of Aeronautics and Astronautics  Nanjing 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