Two-dimensional　Ti3C2　MXene　with　high　bulk　density　can　act　as　prospective　electrode　material　to　construct　high　volumetric　energy　density　supercapacitors.　Herein,　a　series　of　nitrogen-doped　Ti3C2　(N-Ti3C2)　films　are　successfully　synthesized　by　adjusting　the　quantity　of　urea　using　a　facile　solvothermal　method.　The　incorporation　of　nitrogen　atoms　can　enlarge　interlayer　spacing　and　diminish　-F　terminal　groups　of　Ti3C2　to　promote　the　diffusion　and　intercalation　of　electrolyte　ions,　and　bring　about　defect　sites　to　provide　more　electrochemical　reactive　sites,　thus　improving　the　specific　capacitance　of　N-Ti3C2.　As　a　result,　the　2.0　N-Ti3C2　film　shows　the　highest　volumetric　capacitance　of　2898.5　F　cm−3　at　scan　rate　of　2　mV　s−1　in　3　M　H2SO4　solution,　which　is　mainly　attributed　to　its　high　pyridinic　N　content　and　low　-F　terminal　groups.　Density　functional　theory　(DFT)　calculations　indicate　that　the　doped　N　atoms　have　a　higher　adsorption　energy　for　protons　to　enhance　the　pseudocapacitance　of　2.0　N-Ti3C2　electrode,　and　the　increased　density　of　states　demonstrate　the　improvement　of　its　electric　conductivity　after　N　doping,　which　promotes　the　rate　performance　of　2.0　N-Ti3C2　electrode.　The　assembled　symmetric　supercapacitor　based　on　2.0　N-Ti3C2　film　delivers　a　high　volumetric　energy　density　of　40.8　Wh　L−1　and　good　cycling　stability.　Our　work　provides　an　effective　and　alternative　strategy　to　improve　capacitance　of　other　MXenes　for　high-performance　supercapacitors.　©　2024　Elsevier　B.V.