The　applications　of　carbon-based　micro-supercapacitors　(MSCs)　based　on　the　electrical　double　layer　capacitance　mechanism　are　usually　limited　by　the　extremely　low　specific　capacitances　and　energy　storage　densities　of　carbon　electrodes　fabricated　from　less　active,　large-size　carbon　materials.　As　a　promising　alternative,　high-activity　N　and　O　co-doped　graphene　quantum　dots　(N-O-GQDs)　offer　a　combination　of　advantages,　such　as　ultrasmall　sizes,　rich　active　sites,　high　hydrophilicity,　and　facile　assembly　into　conductive　carbon　films.　Here　we　report　the　facile　electrophoresis　construction　of　carbonbased　MSCs　for　ultrahigh　energy　density　storage　using　N-O-GQDs　as　the　initial　electrode　material.　The　N-O-GQD　MSCs　show　extremely　high　volumetric　capacitances　of　325　F　cm(-3)　in　H2SO4　due　to　their　high　pseudocapacitive　activity,　high　loading　density,　and　enhanced　electrolyte　wettingability　ascribed　to　a　large　amount　of　doped　nitrogen　and　oxygen　functional　groups.　They　deliver　an　ultrahigh　volumetric　energy　density,　superior　to　that　of　thin-film　lithium　batteries.　Three　connected　all-solid-state　N-O-GQD　MSCs　can　light　a　red　light-emitting　diode.　Furthermore,　the　pseudocapacitive　MSCs　maintain　high　power　densities,　and　cycling　stability　owing　to　improvements　in　electrical　conductivity　and　electrolyte　penetration.　The　important　results　highlight　the　promising　applications　of　high-activity　nanographenes　in　on-chip　power　sources　for　driving　diverse　micro-devices.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.