Nb2O5/reduced Graphene Oxide Nanocomposite Anode for High Power Hybrid Supercapacitor Applications

摘要

Hybridizing faradaic and non-faradaic charge storage mecha- nisms permits hybrid supercapacitors to achieve desirable high energy-power characteristics. Although the hybridization ap- proach increases the energy density, discrepancies in the reaction kinetics, especially sluggish charge-transfer reactions in Faradaic battery-type electrodes, curtails the power density. To increase the power density of battery-type electrodes, an orthorhombic phase of niobium pentoxide (Nb2O5) is one of the most prominent contenders because the orthorhombic crystal structure provides two-dimensional transport channels for fast Li-ion diffusion. However, such ultrafast Li-ion diffusion cannot be realized due to its electrical-insulating nature.