Hard　carbon　anodes　face　critical　challenges　in　achieving　durable　solid　electrolyte　interphase　(SEI)　and　ultrafast　ion　diffusion　to　complement　capacitive　cathodes　in　sodium-ion　hybrid　capacitors　(SIHCs),　despite　their　low-voltage　sodium　storage　advantages.　Herein,　we　propose　a　computational-experimental　symbiosis　resolving　this　impasse.　Density　functional　theory　(DFT)　screening　reveals　that　dual　fluorine/nitrogen　doping　synergistically　modulates　the　electronic　configuration　of　carbon,　where　fluorine　reduces　the　Na+　adsorption　energy　barrier　through　strong　electronegativity,　while　nitrogen　introduces　metastable　adsorption　sites.　Guided　by　this　insight,　we　developed　fluorine　and　nitrogen　co-doped　porous　hard　carbon　nanosheets　(FN–HC)　through　a　space-confined　molten　salt　pyrolysis　method,　which　function　as　both　the　anode　and　cathode　in　SIHCs.　Mechanistic　studies　combining　operando　spectroscopy　and　molecular　dynamics　simulations　reveal　F/N-coordinated　nanopockets　enabling　inorganic-rich　(NaF)　SEI　layer　with　higher　ionic　diffusion　coefficient　than　conventional　organic-dominated　interfaces.　Moreover,　the　dual-active　surface　chemistry　provides　abundant　adsorption　sites,　enhancing　the　anion　(PF6-)　adsorption/desorption　capacitance.　Consequently,　the　resulting　AFN–HC//FN–HC　SIHCs　exhibit　outstanding　energy/power　densities　(154　Wh　kg-1/8485　W　kg-1)　and　long-term　cycling　stability　(83.7　%　capacity　retention　after　7000　cycles　at　2　A　g-1).　This　interface-kinetics　co-regulation　paradigm　establishes　a　universal　framework　for　designing　multifunctional　carbon　architectures,　bridging　the　gap　between　battery-type　anodes　and　capacitor-type　cathodes　in　hybrid　energy　storage　systems.　©　2025　Elsevier　B.V.