Effect of conducting polymer incorporated heterostructure morphology of MgCo2O4@PPy nanosheets: A promising cathode material for asymmetric supercapacitor applications

Abstract In this work, MgCo2O4@PPy composite material was synthesized by using hydrothermal and chemical polymerization methods. In 2 M KOH electrolyte solution, the pure and composite electrodes deliver specific capacitance of 632 Fg-1 and 988 Fg-1 at a low current density of 1 Ag-1. The MgCo2O4@PPy composite electrode demonstrates high specific capacitance, long-cyclic ability, high capacitive retention, and a large energy density when utilised as an asymmetric device (ASC). A good combination of conducting polymers, which significantly improves the electrochemically active site of the electrolyte electrode interface, is credited with the MgCo2O4@PPy composite electrode material's good electrochemical behaviour. At the same time, the heterostructure shape (Nanosheet@nanospherical) influences electrolyte solution penetration and electron/ion transport. These materials have a promising future in the realm of electrochemical energy storage.