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However, achieving satisfactory selectivity on Cu catalysts poses a grand challenge because of the sluggish C\u2500C coupling and competitive balance between adsorbed intermediates. Herein, in this work, a distinct type of bromine\u2010mediated Ag\u2500Cu heterogeneous tandem catalyst, is rationally designed by integrating synergistic sites to promote enhanced *CO accumulation and its protonation for subsequent coupling for C\n                    <jats:sub>2+<\/jats:sub>\n                    synthesis. Within this tandem system, AgBr modified Ag nanoparticles, and Cu\n                    <jats:sub>2<\/jats:sub>\n                    O form a heterogeneous interface. In an alkaline gas\u2010diffusion electrolyzer, the composite catalyst Ag\/AgBr\/Cu\n                    <jats:sub>2<\/jats:sub>\n                    O\u20101 enables highly efficient CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010to\u2010C\n                    <jats:sub>2+<\/jats:sub>\n                    conversion, achieving high C\n                    <jats:sub>2+<\/jats:sub>\n                    production with a highest Faradaic efficiency of 82.7% and a partial current density of 168.2 mA\u00b7cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , which outperforms both physically mixed Ag\/Cu\n                    <jats:sub>2<\/jats:sub>\n                    O as well as pure Cu\n                    <jats:sub>2<\/jats:sub>\n                    O counterparts. By using electrochemical in situ Fourier transform infrared (FTIR) spectroscopy, we find that our bromine\u2010promoted tandem catalyst significantly increases both *CO and *CHO coverage on the surface for triggering asymmetric C\u2013C coupling. Density functional theory (DFT) calculations further disclose energetically favorable *CO\u2013*CHO coupling route for C\n                    <jats:sub>2<\/jats:sub>\n                    dimer formation. This work highlights the significance of bromine\u2010mediated tandem catalysis for improving CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010to\u2010C\n                    <jats:sub>2+<\/jats:sub>\n                    conversion.\n                  <\/jats:p>","DOI":"10.1002\/smll.73300","type":"journal-article","created":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T08:30:42Z","timestamp":1775205042000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Bromine\u2010Promoted Tandem Catalysis for C\n                    <sub>2+<\/sub>\n                    Production from CO\n                    <sub>2<\/sub>\n                    Electroreduction"],"prefix":"10.1002","volume":"22","author":[{"given":"Xinyuan","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yalan","family":"Mao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9519-6330","authenticated-orcid":false,"given":"Xiaojing","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yidan","family":"Sun","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials\u2010Oriented Chemical Engineering School of Energy Science and Engineering Nanjing Tech University  Nanjing 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