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Here, we design a 3D\u2010CuAg\u2010GDE for eCO\n                    <jats:sub>2<\/jats:sub>\n                    RR\u2010to\u2010C\n                    <jats:sub>2+<\/jats:sub>\n                    products, which shows a remarkable C\n                    <jats:sub>2+<\/jats:sub>\n                    Faradaic efficiency (FE) of 82.04% at \u22120.88\u00a0V versus RHE and a partial current density of 565.18\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Experimental and theoretical analyses demonstrate that the chitosan with multiple functional groups induces the formation of 3D architecture, which enhances the accessibility of reactive sites and mitigates the limitations associated with CO\n                    <jats:sub>2<\/jats:sub>\n                    diffusion. The abundant hydrogen bonds between chitosan and CO\n                    <jats:sub>2<\/jats:sub>\n                    promote the adsorption and enrichment of reactant. Furthermore, the Cu site exhibits stronger activation capacity for CO\n                    <jats:sub>2<\/jats:sub>\n                    and facilitates the subsequent electron transfer process for the formation of intermediate *CO. The DFT simulation also reveals the thermodynamic favorable for *CO migrating from Cu site to Ag site. Moreover, the Ag site exhibits a more negative Gibbs free energy for the protonation of *CO to *CHO, which facilitates the asymmetric coupling of *CO (Cu site) and *CHO (Ag site), ultimately enhancing the generation of C\n                    <jats:sub>2+<\/jats:sub>\n                    products. Consequently, the unique 3D structure and tandem synergistic interaction of the Cu\u2500Ag dual sites achieves high activity for eCO\n                    <jats:sub>2<\/jats:sub>\n                    RR\u2010to\u2010C\n                    <jats:sub>2+<\/jats:sub>\n                    products.\n                  <\/jats:p>","DOI":"10.1002\/anie.202510167","type":"journal-article","created":{"date-parts":[[2025,9,15]],"date-time":"2025-09-15T12:46:51Z","timestamp":1757940411000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["3D Gas Diffusion Layer with Dual\u2010Metal Sites for Enhanced CO\n                    <sub>2<\/sub>\n                    Electrolysis to C\n                    <sub>2+<\/sub>\n                    Products"],"prefix":"10.1002","volume":"64","author":[{"given":"Guixian","family":"Xie","sequence":"first","affiliation":[{"name":"Institute of Molecular Metrology, College of Chemistry and Chemical 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