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Here, we introduce a nanogrid\u2010directed interfacial electric field engineering strategy that addresses these limitations by spatially confining Sn nanoparticles within a conductive carbon nanotube nanogrid framework (Sn@CNT). The hierarchical architecture induces intense and well\u2010distributed interfacial electric fields, which accelerate charge transport, optimize the adsorption\u2013desorption kinetics of *HCOOH intermediates, and promote interfacial H\n                    <jats:sub>2<\/jats:sub>\n                    O dissociation while maintaining a favorable local ion environment. As a result, the Sn@CNT catalyst delivers a Faradaic efficiency (FE) of 95.6% for formate at 300\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and maintains over 90% FE for 200 h in a flow cell in alkaline conditions. In the solid\u2010electrolyte cell, the formate combines with protons to yield formic acid, enabling stable production of 1.1\u00a0\n                    <jats:sc>m<\/jats:sc>\n                    formic acid at 400\u00a0mA for more than 300 h without observable performance decay. Operando spectroscopy and theoretical simulations reveal that the CNT nanogrid establishes a confined interfacial field that redistributes local charges, facilitates H\n                    <jats:sub>2<\/jats:sub>\n                    O activation, and lowers the desorption barrier of *HCOOH intermediates. This cooperative field modulation also establishes a mild microenvironment that enhances CO\n                    <jats:sub>2<\/jats:sub>\n                    reduction kinetics while suppressing the competing hydrogen evolution reaction. This work demonstrates nanogrid\u2010directed interfacial field engineering as a broadly applicable approach for tailoring electrochemical interfaces, offering design principles for efficient and stable CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010to\u2010formate electrosynthesis.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514141","type":"journal-article","created":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T12:56:33Z","timestamp":1768827393000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carbon Nanogrid\u2010Directed Interfacial Electric Field Engineering Boosts Selective CO\n                    <sub>2<\/sub>\n                    \u2010to\u2010Formate Electrosynthesis"],"prefix":"10.1002","volume":"22","author":[{"given":"Zewen","family":"Wang","sequence":"first","affiliation":[{"name":"Key Laboratory of Bio\u2010Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang University  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meiling","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang University  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mingwei","family":"Fang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang University  Beijing P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4002-2226","authenticated-orcid":false,"given":"Ying","family":"Zhu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang University  Beijing P. R. China"},{"name":"State Key Laboratory of Bioinspired Interfacial Materials Science, Center for Bioinspired Science and Technology, Hangzhou International Innovation Institute Beihang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lei","family":"Jiang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio\u2010Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry Beihang University  Beijing P. R. China"},{"name":"CAS Key Laboratory of Bio\u2010Inspired Materials and Interface Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing P. R. 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