Ever-increasing energy demand, accelerated race to energy independency, and concern over environmental impact has significantly accelerated the development of renewable energy sources such as solar energy, geothermal energy, and wind energy. Most renewable energy sources of intermittent nature require effective energy storage systems. Latent heat storage is a particularly attractive technique due to its high capacity and its ability to store energy at near constant temperature corresponding to the phase transition temperature of PCM. The commonly used PCMs include paraffin waxes, fatty acids and their binary mixture, hydrate salt such as Glauder salt (Na2SO4 · H2O), and aromatics. However, the poor thermal performance has severely limited the application of current PCMs for high power, transient systems, and one of the major challenges facing energy industries such as renewable energies and waste heat recovery .