Energy materials (EMs) have attracted the interest of researchers due to the vast usage of EMs in energy-based applications such as energy conversion and energy storage. The researchers are focusing on the development of EMs by understanding the EM characteristics and architectures towards the production of high-efficiency devices at low cost. The EMs can be categorized into zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) materials. Each class of architecture of EMs can be useful in different classes of applications, such as batteries, supercapacitors, photovoltaic cells, fuel cells, water electrolysis, hydrogen storage, carbon capture and storage, piezoelectric, and thermoelectric.