Facile solvothermal synthesis of Ni-Co MOF/rGO nanoflakes for high-performance asymmetric supercapacitor

Abstract

• Nickel cobalt metal organic framework derived with rGO nanoflakes were successfully designed. • A single nanoflakes is composed of interconnected Ni-Co MOF/rGO nanoparticles . • The Ni-Co MOF/rGO porous structure with ultrahigh-conductivity provides a highway for electron transfer . • The optimal Ni-Co MOF/rGO electrode with the particular 10 mg rGO compose with NiCo-MOF (NCG-10) achieves the maximum specific capacitance of 1320 Fg −1 at 4 mAcm −2 and the excellent rate capability of 89.49% was shown after 5000th cycles. • The supercapacitor of Ni-Co MOF/rGO//AC achieves an excellent electrochemical property . Electron transport characteristics continue to be a barrier for supercapacitor electrodes composed of metal-organic frameworks (MOFs). Therefore, an electrode composite material Ni-Co MOF/rGO was synthesized from a Nickel cobalt-based metal–organic framework (Ni-Co MOF) composed with reduced graphene oxide (rGO) using a simple solvothermal method to improve its electron transfer property. The Ni-Co MOF/rGO nanocomposite demonstrates a high specific capacitance of 1320 Fg −1 at 4 mAcm −2 . The asymmetric activated carbon//Ni-Co MOF/rGO device delivers an energy density of 94.4 Wh kg −1 and power density of 1291 Wkg −1 , which still holds an energy density of 39.82 Whkg −1 and power density of 359.70 Wkg −1 , as well as a long cycle life 90.6 % capacitance retention after 5000 th cycles. Ni-Co MOF/rGO ASC is a superb energy storage device as a result, with both practical and financial value. This work's synergistic effect technique can be simply used to create more MOFs with distinctive crystal structures and other redox-active additives, opening up new research possibilities for investigating alternative energy storage technologies.