Facile synthesis of MgO-carbon nanocomposites for advanced capacitive electrode materials

The current study aims to develop a unique approach for constructing an asymmetric supercapacitor utilizing a nanocomposite of MgO-carbon as electrode material. The geometrical surface area of the MgO-carbon has shown to be highly porous with different porosities, and the value is 210 m²g⁻¹. This supercapacitor operates with an aqueous electrolyte consisting of 1 M KOH. The findings indicate that the test cell exhibited exceptional electrochemical output within the voltage range of 0 to 1 V. The capacitance of the MgO-carbon cell is measured to be 225 F g⁻¹ at a current density of 2 A g⁻¹. According to research on cycling, the aforementioned cell has demonstrated the ability to maintain 97% of its original capacitance following 20,000 cycles. The findings of this study suggest that the MgO-carbon holds promise as an electrode material for the development of environmentally friendly and cost-effective energy storage devices. This composite exhibit excellent energy and power densities, along with a prolonged cycle life.