This edited book focuses on the latest advances and development of utilizing two-dimensional nanostructures for energy and its related applications. Traditionally, the geometry of this material refers to -thin film- or -coating.- The book covers three main parts, beginning with synthesis, processing, and property of two-dimensional nanostructures for active and passive layers followed by topics on characterization of the materials. It concludes with topics relating to utilization of the materials for usage in devises for energy and its related applications.