**3. Summary and perspective**

Carbon has already made a revolution in the world. Now its surface engineering with variety of functional materials and nanoporous structure are the fascinating parts of the research. In the light of the aforementioned studies, a broad range of carbon nanomaterials with various dimensions and unique morphological structure designs have been made and successfully implemented in energy storage device fabrication technologies. The incorporation of heteroatoms into the carbon network provides a new class of carbon materials with unique properties unmatched with parental carbon materials. Compositing carbon nanomaterials with metal oxides/ conducting polymers having pseudocapacitance increases energy density largely but compromise with rate capability and cycling life. In this chapter, we have thoroughly conferred the recent progress of carbon nanomaterials based supercapacitors. The potential of carbon nanomaterials and its composites for supercapacitors is in resolving the foreseen of clean energy mitigation. Various materials, methods and technologies have been employed in finding a solution for an energy storing device with high capacitance along with high energy/power density. No doubt, carbon materials are potential candidates for supercapacitor electrode materials but they need a supporting active material to enhance their performance. Nevertheless, increase in specific capacitance value, power density and energy density in certain cases gives a hope that if the research continues in right direction then one-day carbon material based supercapacitor can bring a new revolution in the electronic world. We are confident that the information presented in this chapter would definitely help in the research and development of carbon nanomaterials based supercapacitors.
