Designing　and　constructing　a　high　performance　and　multi-component　nickel-based　material　is　preferable　for　efficient　energy　storage　devices.　In　this　study,　we　reasonably　designed　a　composite　material,　NiC2O4/NiCo　layered　double　hydroxide　(LDH),　composed　of　1D　NiC2O4　nanorods　and　3D　NiCo-LDH　nanoflowers　self-assembled　from　nanosheets　via　a　hydrothermal　method.　This　causes　NiCo-LDH　nanoflowers　to　stretch　out,　increasing　the　specific　surface　area　(up　to　47　m2　g−1),　improving　contact　with　the　electrolyte　and　providing　abundant　active　sites,　speeding　up　the　transfer　of　protons.　The　excellent　double　redox　reactions　of　NiC2O4　and　NiCo-LDH　expedite　the　reaction　kinetics　and　boost　electrochemical　activities,　resulting　in　high　energy　densities　of　37.6　Wh　kg−1　and　high　power　densities　of　809.8　W　kg−1　for　the　NiC2O4/NiCo-LDH||AC　hybrid　supercapacitor　devices.　Furthermore,　DFT　calculations　indicate　NiC2O4/NiCo-LDH　enhance　the　adsorption　ability　of　OH−.　And　the　improved　electrochemical　performance　of　NiC2O4/NiCo-LDH　is　due　to　partial　electrons　transfer　through　the　interface.　©　2024　Elsevier　Ltd