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Replacing OER with a more energetically and economically favorable alternative anodic reaction is therefore essential. In this study, we developed a highly efficient Cu\u2013Ag catalyst for anodic formaldehyde oxidation reaction (FOR). Systematic investigations employing in situ Raman spectroscopy and comprehensive electrochemical analyses revealed that Cu enables\u00a0an earlier onset potential for FOR, and Ag enhances formaldehyde adsorption, leading to synergistically improved performance. The optimal Cu\n                    <jats:sub>3<\/jats:sub>\n                    Ag\n                    <jats:sub>7<\/jats:sub>\n                    catalyst exhibited superior FOR performance, with an onset potential of\u00a0\u22120.05\u00a0V versus the reversible hydrogen electrode (\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>RHE<\/jats:sub>\n                    ) and Faradaic efficiencies for HCOO\n                    <jats:sup>\u2212<\/jats:sup>\n                    exceeding 90% from 0.1 to 0.5\u00a0\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>RHE<\/jats:sub>\n                    . When coupled with CO\n                    <jats:sub>2<\/jats:sub>\n                    RR, the FOR||CO\n                    <jats:sub>2<\/jats:sub>\n                    RR system enabled dual\u2010side HCOO\n                    <jats:sup>\u2212<\/jats:sup>\n                    production, achieving a total HCOO\n                    <jats:sup>\u2212<\/jats:sup>\n                    yield rate of 0.39\u00a0mmol h\n                    <jats:sup>\u22121<\/jats:sup>\n                    cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at an ultra\u2010low cell voltage of 0.5\u00a0V, surpassing the performance of previously reported electrochemical HCOO\n                    <jats:sup>\u2212<\/jats:sup>\n                    production systems. Furthermore, this study presents a versatile anodic strategy that integrates FOR with a range of cathodic reactions, offering an energy\u2010efficient chemical synthesis approach for the advancement of sustainable electrochemical technologies.\n                  <\/jats:p>","DOI":"10.1002\/anie.202516232","type":"journal-article","created":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T12:00:49Z","timestamp":1759320049000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Energy\u2010Efficient Dual Formate Electrosynthesis via Coupled Formaldehyde Oxidation and CO\n                    <sub>2<\/sub>\n                    Reduction at Ultra\u2010Low Cell Voltage"],"prefix":"10.1002","volume":"64","author":[{"given":"Hyoseok","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST)  Ulsan 44919 Republic of 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