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Poly(3,4\u2010ethylenedioxythiophene): polystyrene\u00a0sulfonate (PEDOT:PSS) has emerged as a promising candidate for capacitive touchscreens and flexible energy storage devices, yet its widespread adoption has been hindered by the intrinsic trade\u2010off between conductivity enhancement and material compatibility. While strong acids can significantly improve PEDOT:PSS\u00a0conductivity, their corrosive nature causes irreversible damage to device components. Here, we develop a benign methanol\u2010benzoic acid co\u2010modification strategy that achieves unprecedented performance metrics. The optimized PEDOT:PSS\u00a0films demonstrate a record conductivity of 3760 S\/cm among organic\u2010modified systems while maintaining optical transparency and mechanical flexibility. Comprehensive spectroscopic characterization reveals that the conductivity enhancement originates from partial PSS removal and structural reorganization into quinoid\u2010dominated configurations. When implemented in flexible supercapacitors, these modified electrodes deliver exceptional electrochemical performance, including an areal capacitance of 852 mF\/cm\n                    <jats:sup>2<\/jats:sup>\n                    85.2 F\/cm\n                    <jats:sup>3<\/jats:sup>\n                    volumetric) at 0.5\u00a0mA\/cm\n                    <jats:sup>2<\/jats:sup>\n                    with outstanding rate capability (71% retention at 10\u00a0mA\/cm\n                    <jats:sup>2<\/jats:sup>\n                    ) and cycling stability (90% capacity retention after 10\u00a0000 cycles). The devices achieve remarkable energy densities of 32.8 \u00b5Wh\/cm\n                    <jats:sup>2<\/jats:sup>\n                    (areal) and 7.14 mWh\/cm\n                    <jats:sup>3<\/jats:sup>\n                    (volumetric), surpassing most reported PEDOT\u2010based supercapacitors. This work establishes a material\u2010friendly approach to engineer high\u2010performance conductive polymers for next\u2010generation flexible electronics.\n                  <\/jats:p>","DOI":"10.1002\/smll.202512694","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T12:08:01Z","timestamp":1782475681000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Super High Conductivity PEDOT: PSS\u00a0via Methanol\u2010Benzoic Acid Co\u2010Modification for Flexible Supercapacitors With Excellent Capacitance"],"prefix":"10.1002","volume":"22","author":[{"given":"Yuliang","family":"Yao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Nuclear Physics and Technology Department of Technical Physics School of Physics Peking University Beijing P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuanpu","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Nuclear Physics and Technology Department of Technical Physics School of Physics Peking University Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Fan","sequence":"additional","affiliation":[{"name":"YanTai Research Institute Harbin Engineering University Yantai P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2354-1822","authenticated-orcid":false,"given":"Engang","family":"Fu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Nuclear Physics and Technology Department of Technical Physics School of Physics Peking University Beijing P. R. 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