FABRICATION OF NANOSHEET SHAPED NiCo2O4@MnO2 ELECTRODE PERFORMANCE FOR ASYMMETRIC SUPERCAPACITOR ENERGY STORAGE APPLICATIONS

Abstract

Abstract Using a microwave synthesis, we prepared a stable NiCo2O4@MnO2 nanosheet heterostructure with good electrical conductivity. The NiCo2O4@MnO2 heterostructure exhibits distinctive features such as a stable nanostructure, rapid electron transport, and a multitude of ion diffusion pathways. The electrode demonstrates a notable specific capacitance of 1215 F g-1, along with a cycling stability of 98% following 10000 cycles. The incorporation of MnO2 is attributed to the material's significant surface area, appropriate pore structure, and notably strong electron conductivity. The fabrication of asymmetric supercapacitor with exceptional electrochemical properties involves the utilization of a heterostructure composed of NiCo2O4@MnO2 as the positive electrode, activated carbon as the negative electrode, and electrolyte consisting of PVA/KOH gel. The supercapacitor exhibits an increased operational range of 1.7 V, a maximum energy density of 49.3 Wh kg-1, a maximum power density of 20.3 kW kg-1, and a favourable capacitance retention of 90% following 10,000 cycles.