A straightforward, low-cost process using cetyl trimethylammonium bromide (CTAB) as a templated sonochemical production method was used to create ZnO nanostructures with the appearance of flowers. Morphological characteristics of ZnO crystals have a greater impact on variables like the CTAB template and sonochemical reaction time. The synthetic strategy is easy to use and economical. The advantage of the flower-like ZnO crystals is the more active reaction centre, which improves redox processes and results in outstanding electrochemical attributes like high specific capacitance, good rate capability, and improved cyclic stability. The flower-like ZnO nanostructures (ZnO-2) deliver the specific capacitance of 425 Fg-1 at a scan rate of 5 mVs-1 from CV analysis whereas the charge/discharge study renders the specific capacitance of 426 Fg-1 at a current density of 1 Ag-1. In long-term cyclic stability analysis, 89 % initial capacitance was retained after 3000 CV cycles at a scan rate of 100 mVs-1. The distinctive flower-like ZnO nanostructures can be extended more for supercapacitor device applications.