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A promising strategy is to covalently anchor cationic groups near catalytic sites, generating local electric fields to stabilize polar intermediates. Here, we employed carbon nanotube (CNT)\u2010immobilized cobalt tetraphenylporphyrin (CoTPP) derivatives as model catalysts, functionalized with quaternary ammonium groups at distinct positions of the phenyl rings. Using vibrational Stark and Tafel analyses, we probed how these cationic groups shape the electric double\u2010layer and CO\n                    <jats:sub>2<\/jats:sub>\n                    RR performance. When anchored at ortho\u2010sites, the cationic groups induced a strong local electric field near the Co site, achieving a Faradaic efficiency (FE) up to 94% in pure acidic electrolyte. These cationic groups at the ortho\u2010sites demonstrated greater ability to promote acidic CO\n                    <jats:sub>2<\/jats:sub>\n                    RR compared to alkali cations or cationic polyelectrolyte modification layers. This enhancement is attributed to the covalent anchoring approach, which enables the creation of a higher cation density around the catalytic site, thereby more substantially increasing the local electric field strength.\n                  <\/jats:p>","DOI":"10.1002\/anie.202518465","type":"journal-article","created":{"date-parts":[[2025,11,11]],"date-time":"2025-11-11T08:15:58Z","timestamp":1762848958000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Covalently Anchored Cationic Groups Tailor Electric Double Layer for Supporting\u2010Electrolyte\u2010Free CO\n                    <sub>2<\/sub>\n                    Reduction in Acidic Media"],"prefix":"10.1002","volume":"65","author":[{"given":"Xinyi","family":"Zou","sequence":"first","affiliation":[{"name":"Department of Chemistry Southern University of Science and Technology  Shenzhen Guangdong 518055 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