Facile synthesis of rGO/DyMnO ₃ nanocomposite directly grown on nickel foam for supercapacitor applications

Abstract The advancement of innovative energy storage electrode materials requires the immediate growth of redox‐active and sensible design of multifunctional electrochemical active materials. Supercapacitors are increasingly favored for the storage of energy owing to their large specific power, rapid charge/discharge times, and long‐term durability. The potential electrochemical energy storage using metal oxides motivated our research team to create DyMnO 3 and their hybrid with reduced graphene oxide (rGO), via hydrothermal process in rGO/DyMnO 3 , as an electrocatalyst with comparatively high electrical conductivity and appropriate electrochemical active surface. This research was conducted utilizing a 2 M KOH as electrolyte within a possible window between −0.1 and 0.6 V. Impressively, our synthesized sample exhibited the remarkable specific capacitance of 1536.78 F g −1 on current density of 1 A g −1 , attributed to quick charge storage and delayed discharging mechanism. The addition of rGO to porous spherical DyMnO 3 enhances electrochemical performance, providing a specific surface area of 250 m 2 g −1 and an electroactive surface area of 2675 cm −2 . The created device displayed electrochemical activity with a high energy density of 149.40 Wh kg −1 at a power density of 719.86 W kg −1 , respectively. Oxygen vacancy enhances results, indicating the rGO/DyMnO 3 nanocomposite's potential for SCs and other electrochemical applications.