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Although alloying and molecular modification have been applied to improve the C\n                    <jats:sub>2<\/jats:sub>\n                    selectivity during CO\n                    <jats:sub>2<\/jats:sub>\n                    ER, the improvements are still not high enough. Herein, we present a simple bilayer coating strategy to significantly enhance the C\n                    <jats:sub>2<\/jats:sub>\n                    selectivity on copper\u2010silver (CuAg) alloy surface. By sequentially coating a bilayer of benzotriazole (BTA) and polyvinylidene fluoride (PVDF) on the surface of CuAg alloy, the Faradaic efficiency (FE) toward C\n                    <jats:sub>2<\/jats:sub>\n                    species increased from 61.4%\u00b12.5% to 78.3%\u00b14.1% in an H\u2010type electrochemical cell. This performance enhancement remained stable during a 10\u2010hour long\u2010term measurement. The PVDF layer could not only modulate the mass transportation of reactants but also confine BTA molecules and prevent their dissolution and\/or detachments. The BTA molecules could stabilize key reaction intermediates, working synergistically with the spillover of Ag, to realize a high FE toward C\n                    <jats:sub>2<\/jats:sub>\n                    during CO\n                    <jats:sub>2<\/jats:sub>\n                    ER. Our finding clarifies the synergistic effects between the sequentially coated small molecule and polymer on alloy catalysts, and this strategy may be combined with many other existing strategies to further improve the FEs of various products during CO\n                    <jats:sub>2<\/jats:sub>\n                    ER in the future.\n                  <\/jats:p>","DOI":"10.1002\/smll.75069","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T07:19:53Z","timestamp":1786519193000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Confining Benzotriazole Around CuAg Alloy With Polyvinylidene Fluoride for Improved Production of C\n                    <sub>2<\/sub>\n                    Species via CO\n                    <sub>2<\/sub>\n                    Electroreduction"],"prefix":"10.1002","volume":"22","author":[{"given":"Chengcheng","family":"Zhu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of Advanced Materials Nanjing Tech University  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qinghua","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of Advanced Materials Nanjing Tech University  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinya","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of Advanced Materials Nanjing Tech University  Nanjing People's Republic of 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaxin","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of Advanced Materials Nanjing Tech University  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaoyang","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of Advanced Materials Nanjing Tech University  Nanjing People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1722-0176","authenticated-orcid":false,"given":"Gang","family":"Lu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics School of Flexible Electronics (Future Technologies), and Institute of 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