Tailoring the Electrochemical Performance of rods-like Co-MOF:Fe - Derived Co3O4 :Fe Electrodes for Supercapacitor Applications

Abstract

With the increasing global demand for energy, there is a critical need for efficient and sustainable energy storage solutions. Supercapacitors (SCs) have emerged as promising candidates due to their high power density, long cycle life, and environmental friendliness. This study explores the development of iron-doped cobalt metal-organic frameworks (Co-MOFs: Fe) and their derived oxides supported on Ni foam as high-performance supercapacitor electrodes. The impact of conversion temperature on electrochemical properties of Co-MOFs: Fe derived Co3O4: Fe was evaluated. The results disclosed that the conversion at 500 °C significantly enhances the surface area, specific capacitance, and charge transfer efficiency of the electrodes. It exhibited the highest specific capacity of 2135.08 F/g at a current density of 1 A g-1, along with excellent cycling stability of 87%. Subsequently, an asymmetric supercapacitor was constructed with the MOF-derived Co3O4: Fe at 500 °C as anode and activated carbon as cathode materials. The device exhibited a specific capacitance of 233.98 F/g at 1 A/g with an energy density of ~ 51.99 Wh/kg, power density of 500.14 kW/kg, and a significant capacity retention of 89 % over 10,000 cycles. These findings validate the potential of Co-MOF: Fe derived Fe-doped Co3O4 as potential materials for practical energy storage applications.