ABSTRACT
Electrochemical supercapacitors (ECs) are being used as an independent energy/power supply or power buffer-assisting batteries, owing to their distinct merits such as high power density and long cycle life. However, their slow frequency response makes them incapable of working like a conventional electrical capacitor used for ripple current filtering, electrical pulse generation and pulse harvesting, and many other applications. Developing high-frequency ECs (HF-ECs) in substation of the bulky electrolytic capacitors, therefore, is highly desirable and has attracted considerable attention recently. In this chapter, several vertically aligned 1D and 2D nanomaterial structures, particularly those based on carbon nanotube and graphene, will be discussed with a focus on developing HF-ECs.
