Figure 3.

Electrochemical results of as-prepared electrodes (Co-MOF, Co₃O₄, Co₃O₄ + Co-MOF, Co₃O₄@Co-MOF) in a three-electrode cell in 3.0 M KOH aqueous solution. (a) CV curves with a scan rate at 30 mV s⁻¹. (b) GCD curves at a current density of 0.5 A g⁻¹. (c) The specific capacitance changing versus current densitiy from 0.5 A g⁻¹ to 8 A g⁻¹. (d) Cycling performance at 5 A g⁻¹ for 5000 cycles.