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The synergy between organic and inorganic components in energy storage devices has attracted considerable interest due to their complementary attributes, including flexibility, long\u2010term stability, and high conductivity. This study presents an innovative approach for synthesizing an organic\u2013inorganic active electrode material by grafting diazonium salts of 8\u2010aminoquinoline (8\u2010AQ\u2010N\n                    <jats:sub>2<\/jats:sub>\n                    <jats:sup>+<\/jats:sup>\n                    ) onto CuFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    nanoparticle (NP) surfaces. Surface analysis confirms the successful covalent functionalization, which establishes a robust interface between quinoline and CuFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs, thereby reducing charge carrier distance and interfacial electrical resistance. The CuFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    component exhibits inter\u2010particle charge transfer, while the redox\u2010active quinoline (Q) contributes to rapid reaction kinetics and a surface\u2010limited reaction mechanism. The synthesized 8\u2010Q\u2010CuFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    heterostructure shows synergistic charge transfer between metal ions and ligands, revealing a high\u2010performance all\u2010solid\u2010state symmetric supercapacitor. The device demonstrated a specific capacitance of 418.3 F g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 1 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , retention of 81.2% capacitance after 11\u00a0000 cycles at 3 A g\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and a high energy density of 35.2\u00a0W h kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    at a power density of 1,600\u00a0W kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Theoretical studies support enhanced capacitance in 8\u2010Q\u2010CuFe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    suitable for flexible and wearable energy storage devices, paving the way for sustainable and portable energy technology advancements.\n                  <\/jats:p>","DOI":"10.1002\/smll.202505578","type":"journal-article","created":{"date-parts":[[2025,9,4]],"date-time":"2025-09-04T09:45:58Z","timestamp":1756979158000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Covalent Functionalization Yields High\u2010Performance Supercapacitor Materials"],"prefix":"10.1002","volume":"21","author":[{"given":"Neha","family":"Singh","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Priyanka","family":"Makkar","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pradeep","family":"Sachan","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ankur","family":"Malik","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Konstantin P.","family":"Katin","sequence":"additional","affiliation":[{"name":"Institute of Nanotechnologies in Electronics, Spintronics, and Photonics National Research Nuclear University \u201cMEPhI\u201d  Moscow 115409 Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9415-5147","authenticated-orcid":false,"given":"Prakash Chandra","family":"Mondal","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur Uttar Pradesh 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,9,4]]},"reference":[{"key":"e_1_2_10_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201306871"},{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2NJ05566J"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsaelm.1c01158"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202009086"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.201403354"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201303971"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202213095"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201600029"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3QI02214E"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2023.215470"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.201701530"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201504349"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00339-022-05590-1"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1142\/S1793604712500464"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jece.2019.103179"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.inoche.2023.111728"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.aba1321"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c12280"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6RA02129H"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1021\/am507014w"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsomega.1c03377"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.synthmet.2019.03.025"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2023.142959"},{"key":"e_1_2_10_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.inoche.2023.111349"},{"key":"e_1_2_10_25_1","first-page":"421","volume":"42","author":"Matiyani M.","year":"2022","journal-title":"Handb. 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