Energy demands have been increasing globally because of the rising population. To fulfill the energy demand, researchers seek highly advanced energy storage devices (ESDs) and the advancement in their performance and stability. Yet, the ESDs do not fulfill the entire criteria required for high-performance electrochemical devices. Therefore, the supercapacitor is gaining significant attention from researchers to advance ESDs. The progression in performance and stability could be achieved using two-dimensional (2D) electrode material. The confinement in the material’s dimension introduces some unique features as per requirement. 2D nanomaterial offers a large surface area, good electrical conductivity, and tremendous electrochemical properties. 2D nanomaterial, with its unique laminar structure, provides stability at the chemical, electrochemical, and thermal levels. The chapter covers the different 2D nanomaterials, such as graphene, reduced graphene oxide, TMDs, TMOs, TMHs, MXene, phosphorene, MOF, h-BN, carbon nitride, and their composites. The chapter also includes different synthesis approaches and their characterization technique. As electrodes, 2D material has demonstrated its potential to promote excellence in supercapacitor performance at the next level.