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Supercapacitor is an emerging technology that promises to play an advance role in new generation electronic devices and systems. Carbon (activated carbon, graphene and carbon nanotube) have attracted tremendous attention for their potential applications in supercapacitor technologies due to their excellent mechanical strength, good electrical conductivity, high electron mobilities, excellent chemical stability in acidic and basic medium, good thermal stability in wide range of temperature, various morphological structures, and large specific surface area. This chapter aims to assess the current status of carbon nanomaterials and their composites for supercapacitor application by discussing the literature in this field and presenting a perspective for future research in supercapacitor technologies.