Herein, we report the chemical synthesis of a core−shell nanoarchitecture comprising CuCo 2 O 4 @CuO (CCO@ CuO) on a flexible stainless steel mesh substrate (FSSM) with CuCo 2 O 4 (core) and CuO (shell) by a simple, cost-efficient, additivefree hydrothermal deposition method, followed by successive ionic layer adsorption and reaction method for fabricating a flexible electrode for an asymmetric supercapacitor (ASC). The nanocomposite of CCO@CuO revealed a high surface area of 98.33 m 2 g −1 and the electrode delivered a high specific capacitance of 713 F g −1 at a high current density of 11 mA cm −2 , which was noted to be higher than those of the individual constituent CuO (436 F g −1 ) and CuCo 2 O 4 (443 F g −1 ) metal oxide electrodes. The CCO@CuO electrode demonstrated remarkable cycling stability (∼90% capacitance retention after 5000 charge−discharge cycles at 15 mA cm −2 ). The ASC device CCO@CuO//rGO (reduced graphene oxide) delivered a maximum energy density of 37.43 Wh kg −1 at a power density of 250 W kg −1 . The device revealed 83% capacitance retention after 4000 cycles. These results indicate that the CCO@CuO/FSSM electrode is a promising functional material for energy storage devices.