Despite their high specific capacitances, metal oxide-based electrodes still do not meet the commercial standard for cycling stability due to their inherent poor electronic conductivity and morphological structural changes during charging and discharging. The marvellous specific capacitance, accompanied by long cycle durability is pivotal for the applications of supercapacitors. In the research article, the distinct precursor volume ratios of copper–nickel solution is to be used for the construction of the binder-free 3D merigold flower like copper-nickel oxide (3D-MCuNi oxide) electrodes, via a hydrothermal method. The XPS, EDAX, and TEM reveal that the increased amount of O-vacancies in the marigold flowers of the copper-nickel oxide composite is caused by a significant number of imperfections in structure and might enhance their electrical conductivity. The marigold flowers-like morphological structure significantly exhibits high hydrophilicity electrode–electrolyte ions with better electrochemical diffusion performance. The optimized volume ratio Cu: Ni=1:1 of 3D-MCuNi oxide composite nanomaterials demonstrates 2387.15 Fg-1 an excellent specific capacitance at 0.6 mAcm-2 current density, moreover 93% cycling capacitive retention performance up to 10,000 cycles. Additionally, flexible hybrid supercapacitor device (HSD) was assembled using reduced graphene oxide (rGO) as negative and 3D-MCuNi oxide as the positive electrodes, which reveals excellent electrochemical charge storage performance with a high energy density 120.9 Whkg−1 and power density 34.82 KWkg−1 having superior cycling stability 87% retention. The 3D-MCuNi oxide composite potential materials are more attractive for charge storage supercapacitor applications.

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