Fabrication of MnCo2O4/g-CN nanohybrid electrodes for enhanced redox kinetics in supercapacitors

Abstract The inspiration for the development of specific nanophase materials comes from the increasing energy needs of the next generation. In the present work, we demonstrated the manufacturing method and evaluated the performance of a supercapacitor electrode built from manganese-cobalt (MnCo 2 O 4 ) embedded in graphitic carbon nitride (g-CN). Hydrothermal-assisted nanohybrids demonstrated a significant increase in specific capacitance (C s ) and exceptional durability. MnCo 2 O 4 /g-CN nanocomposite had a C s of 1125.2 F g -1 , a power density (P d ) value 200 W kg -1, and an energy density (E d ) of 25 Wh kg -1 at 1 A g -1 . Chronoamperometry (CA) measurements obtained after 30 hours show that the electrode has outstanding electrochemical stability. The existence of varied manganese ion oxidation states, significant specific surface area (SSA), nitrogen-rich structure, and mesoporous nature, which allows rapid ion movement, all contributed to the improved electrochemical functionality. The inclusion of electrochemically active patches inside g-CN's nanosheet design influenced its electrochemical characteristics. According to their results, adopting MnCo 2 O 4 /g-CN nanohybrid by means of electrode material used for energy storage seems like a desirable and affordable choice.