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However, their practical implementation in supercapacitors is hindered by structural instability and limited cycling durability. Here, the covalent functionalization of Ti<jats:sub>3<\/jats:sub>C<jats:sub>2<\/jats:sub>T<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic> MXenes with 5,5\u2032\u2010bis(triisopropoxysilyl)\u20102,2\u2032\u2010bipyridine (BPS) to mitigate these limitations is investigated. The functionalization is performed in three different solvents, i.e., <jats:italic>m<\/jats:italic>\u2010xylene, ethanol, and isopropanol, to elucidate the influence of solvent choice on surface modification efficacy. X\u2010ray photoelectron spectroscopy confirms BPS incorporation in all samples, but only <jats:italic>m<\/jats:italic>\u2010xylene promotes effective functionalization without excessively compromising charge transport. Notably, Ti<jats:sub>3<\/jats:sub>C<jats:sub>2<\/jats:sub>T<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>\u2010BPS (<jats:italic>m<\/jats:italic>\u2010xylene) shows enhanced ionic conductivity (2.95 mS cm<jats:sup>\u22121<\/jats:sup>), improved H\u207a diffusion (4.08 \u00d7 10<jats:sup>\u221212<\/jats:sup> cm<jats:sup>2<\/jats:sup> s<jats:sup>\u22121<\/jats:sup>), and higher pseudocapacitive contributions compared to pristine Ti<jats:sub>3<\/jats:sub>C<jats:sub>2<\/jats:sub>T<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>. When used as the negative electrode in an asymmetric supercapacitor, the Ti<jats:sub>3<\/jats:sub>C<jats:sub>2<\/jats:sub>T<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>\u2010BPS\/\/activated carbon device achieves a maximum energy density of 32.3\u00a0Wh kg<jats:sup>\u22121<\/jats:sup> and a power density of 12\u00a0300\u00a0W kg<jats:sup>\u22121<\/jats:sup>, with 88.36% capacitance retention after 15\u00a0000 cycles, significantly outperforming the pristine Ti<jats:sub>3<\/jats:sub>C<jats:sub>2<\/jats:sub>T<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>. These findings highlight the critical role of solvent selection in achieving effective functionalization and demonstrate its impact on the development of robust, high\u2010performance MXene\u2010based supercapacitors.<\/jats:p>","DOI":"10.1002\/smll.202507744","type":"journal-article","created":{"date-parts":[[2025,9,12]],"date-time":"2025-09-12T10:20:16Z","timestamp":1757672416000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Surface Engineering of Ti<sub>3<\/sub>C<sub>2<\/sub>T<sub>x<\/sub> MXenes via Silanol Functionalization for Improved Electrochemical Performance"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-8836-555X","authenticated-orcid":false,"given":"Abelardo","family":"S\u00e1nchez\u2010Oliva","sequence":"first","affiliation":[{"name":"Department of Inorganic, Organic Chemistry and Biochemistry University of Castilla\u2010La Mancha\u2010IRICA Faculty of Science and Chemical Technologies  Ciudad Real 13071 Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3235-0545","authenticated-orcid":false,"given":"Ver\u00f3nica","family":"Montes\u2010Garc\u00eda","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg &amp; 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