<p>Herein, ZIF-67 was used as a cobalt-based metal–organic framework precursor to obtain Co₃O₄ nanosheets due to its uniform cobalt-imidazolate framework and its ability to form porous structures upon thermal decomposition. The ZIF-67-derived Co₃O₄ nanosheets were synthesized by a hydrothermal method followed by a calcination process. The ZIF-67-derived Co₃O₄ nanosheets presented pore sizes of 20&#xa0;nm, 28&#xa0;nm, and 139&#xa0;nm and a surface area of 315 m²&#xa0;g⁻¹. The porous nanostructure resulted in a high specific capacitance of 350 F g⁻¹ at 5 A g⁻¹. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) analysis confirmed the electrochemical activity and charge-storage behavior of the material. The charge-transfer resistance is negligible, as indicated by the very small semicircle in the electrochemical impedance spectroscopy plots, confirming high electrical conductivity before and after 5000 cycles. The Co₃O₄ nanosheet-based electrode material exhibits 95% capacitance retention after 5000 cycles. The redox reactions in the Co₃O₄ electrode material are dominated by ion diffusion because the b value is close to 0.5, as confirmed by power law calculations. The charge-storage process is dominated (92%) by diffusion, whereas only 8% of the charges are stored by surface processes when analyzed at 50&#xa0;mV&#xa0;s⁻¹. The asymmetric device exhibits a capacitance of 156 F g⁻¹ at 1 A g⁻¹, maximum energy density of 63 Wh kg⁻¹, maximum power density of 12750 W kg⁻¹, and 95% cyclic stability after 10,000 cycles. The diffusive and capacitive processes contribute significantly to maximizing charge storage in the Co₃O₄ electrode material for battery-type supercapacitive devices.</p> Graphical Abstract <p></p>