This authored monograph presents the state-of-the-art improvements in 2D materials, focusing on their most significant achievements, as well as recent emergence and potential applications. The book discusses synthetic protocols as well as the structural chemistry and physical properties of various 2D materials and explores their energy-related utilization. The main energy harvesting applications such as piezoelectric generators, solar cells and hydrogen evolution reactions are analyzed, while special focus is also given to the related energy storage technologies such as rechargeable batteries, supercapacitors and wearable energy storage devices. This volume sheds new light on 2D materials and their applications and will be a useful tool for graduates and academics working in the fields of materials science, materials physics and chemistry.