Recent Developments in the Field of Supercapacitor Materials

Energy storage is one of the crucial requirements for today’s life to store energy for later use. Energy storage critically reduces the dependence on backup power supplies. In recent times, fascinatingly, energy storage systems have been developed in compactable sizes and shapes with sustainable and appreciable backup power. However, due to some challenges in conventional storage systems, supercapacitors are gaining a huge interest which satisfies the increasing demands of energy storage devices. Supercapacitors are well-recognized for their long cycle life, high power density, and the ability for less charge and discharge time. Accordingly, in supercapacitor electrodes, activated carbon is extensively used as a base material. Current research documented that the amorphous mixed metal oxides and nanostructured oxides are also used in supercapacitor devices to exhibit high performance. Keeping this in view, this chapter is reviewed to provide information on the different types of recent developments in supercapacitors and their performance. In addition, recent developments in green approaches to supercapacitor applications in MnO2 -based electrodes and composites, supercapacitors performance, power capability, and cycle life are also discussed.