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Herein, a hierarchical modulation strategy is proposed for the precise assembly of Boron (B) and Tin (Sn), resulting in novel copper (Cu)\u2013aerogel (BSnCu3) structures with both structural and functional hierarchies for advanced CO\n                    <jats:sub>2<\/jats:sub>\n                    electroreduction. Superficial assembled Tin creates Cu\n                    <jats:sup>0<\/jats:sup>\n                    protective layer for high stability, the body assembled Boron improves the binding affinity to intermediates and shifts Cu d\u2010band upward for enhanced charge transfer. BSnCu3 achieves\u00a0exceptional performance, including an\u00a0ethanol selectivity of 93.2%, a\u00a0Faradaic efficiency (FE) of 90.3%, and an\u00a0ultralow overpotential of 0.12\u00a0V, alongside\u00a0remarkable stability. Leveraging the\u00a0synergistic effects\u00a0of regionally assembled Boron\/Tin and the\u00a0efficient charge\/mass transfer\u00a0of the 3D nanowire network, BSnCu3 attains a\u00a0record\u2010breaking tradeoff index of 2.74, surpassing all reported values. This work presents an inspiring strategy and sets a\u00a0new benchmark\u00a0for advanced electrocatalyst design.\n                  <\/jats:p>","DOI":"10.1002\/smll.202504818","type":"journal-article","created":{"date-parts":[[2025,8,16]],"date-time":"2025-08-16T04:28:37Z","timestamp":1755318517000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Hierarchical Modulation in Cu\u2010Aerogel Enables Breakthrough CO\n                    <sub>2<\/sub>\n                    Electroreduction for Combating Stability\u2010Efficiency\u2010Selectivity Tradeoff"],"prefix":"10.1002","volume":"21","author":[{"given":"Amare Aregahegn","family":"Dubale","sequence":"first","affiliation":[{"name":"Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology  Yancheng 224051 China"},{"name":"Center for Material Science and Engineering College of Natural and Computational Science Addis Ababa University  Addis Ababa 1176 Ethiopia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han\u2010Yu","family":"Ling","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology  Yancheng 224051 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei\u2010Qi","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology  Yancheng 224051 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Cheng","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology  Yancheng 224051 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