The demand for high-performance supercapacitors has driven extensive research into novel electrode materials with superior electrochemical properties. This study explores the supercapacitive behavior of quaternary CuNiCoZnO (CNCZO) films engineered into a three-dimensional (3D) flower-like morphology and developed on versatile substrates, including carbon cloth, stainless steel mesh, and nickel foam. The unique structural design, comprising interconnected nanosheets, enhances the electroactive surface area, facilitates ion diffusion, and improves charge storage capability. The synergistic effect of the multi-metallic composition contributes to remarkable electrochemical characteristics, including high specific capacitance, excellent rate capability, and outstanding cycling stability. Furthermore, the influence of different substrates on the electrochemical performance is systematically investigated to optimize material–substrate interactions. Electrochemical evaluations reveal outstanding specific capacitance values of 2318.5 F/g, 1993.7 F/g, and 2741.3 F/g at 2 mA/cm² for CNCZO electrodes on stainless steel mesh, carbon cloth, and nickel foam, respectively, with capacitance retention of 77.3%, 95.7%, and 86.1% over 5000 cycles. Furthermore, a symmetric device of CNCZO@Ni exhibits a peak specific capacitance of 67.7 F/g at a current density of 4 mA/cm², a power density of 717.4 W/kg, and an energy density of 25.6 Wh/kg, maintaining 84.5% stability over 5000 cycles. The straightforward synthesis of CNCZO on multiple substrates presents a promising route for the development of flexible, high-performance energy storage devices.

In this paper, we demonstrate the synthesis of ZnFe₂O₄ nanostructures via a simple hydrothermal route. We have deposited ZnFe₂O₄ nanostructures on nickel foam substrate at different temperatures to study the correlation between temperature alteration and morphology variation of ZnFe₂O₄ nanostructures. Also, electrochemical studies were conducted to better understand the supercapacitive behaviour of the effect of temperature and morphology variation on the electrodes. The study consisted of ZnFe₂O₄ electrode material synthesized at four different temperatures and a change in morphology was monitored. ZnFe₂O₄ microspheres synthesized at 120℃ exhibit a maximum specific capacitance of 883 F/g at 5 mV/s in 1M KOH with an energy density of 113 Wh/kg and power density of 0.8 kW/kg and a cyclic stability upto 2000 cycles with a retention rate of 85%.