ABSTRACT
The electrochemical supercapacitor is considered to be one of the more efficient energy storage systems that usually hold high energy density and long cycle life, unlike batteries. Carbon nanostructures have traditionally been used as active electrode materials in supercapacitors since their inception. Supercapacitors can be classified into different categories based on their charge storage mechanisms, geometries as well as nature of devices. This chapter discusses detailed charge storage mechanisms of different supercapacitors and the roles of various carbonaceous materials used to demonstrate the performance of the supercapacitor. Finally, the use of supercapacitors in various electronics as well as the advantages and disadvantages of this energy storage system are clearly studied.
