This review offers a critical survey of the published studies concerning nano-enhanced phase change materials to be applied in energy harvesting and conversion. The composite was formulated with 50 wt% Glauber's salt, 30 wt% graphite, and 20 wt% aluminum oxide to improve thermal. Phase change materials (PCMs) possess high latent heat during the solid–liquid phase transition, making them promising materials for thermal energy storage. In addition, we carried out. Advanced thermal energy storage is playing an increasingly important role in improving the performance and reliability of solar energy systems.