The potential of transition metal dichalcogenides (TMDCs) in nano energy has garnered considerable interest. Layered materials from the transition metal dichalcogenides provide 2D systems a rich, mainly unexplored source of diversity. Exfoliation or vapour phase deposition techniques may be used to create better the right-sized, adjustable-thickness, and better transition metal dichalcogenides layers electrical and optical characteristics. Due to their very high surface areas and electrical characteristics, semiconducting transition metal dichalcogenides monolayers have been shown to be practical for a variety of energy-related applications, including nano generators, energy storage, electrocatalytic hydrogen synthesis, and green electronics. In this review, we first describe the structure including surface growth as morphology, domain size and grain boundaries and orientation, characteristics, and preparation including top-down method and bottom-up method. Top-down method as liquid exfoliation and mechanical cleavage, bottom-up method as chemical exfoliation, chemical vapor deposition and solvothermal before going into great depth about the creation of Applications for nano energy based on transition metal dichalcogenides.