Thermal energy storage using phase change materials (PCMs) has received significant attention in the field of sustainable energy development. However, extremely low thermal conductivity and seepage issues are two long-standing drawbacks limiting PCM-based applications. In this study, an alternative strategy is used to construct composite PCMs by introducing hybrid functional materials as support and liquid n-alkane as energy storage material through a facile vacuum impregnation method. The hybrid functional material, obtained from a commercially available natural mineral, montmorillonite (Mt), and boron nitride, possesses high specific surface area and physicochemical stability and can endow the n-dodecane (DA) with beneficial characteristics. Hybrid-functional-material-supported DA is suitable for ambient energy harvesting in the form of latent heat, with a 309% growth rate in energy storage capacity compared with that of Mt/DA. The thermal conductivity reached 0.795 W/m·K, which is 2.01 and 5.89 times higher than those of Mt/DA and pristine DA, respectively. In addition, the composite PCMs exhibited ultra-high leakage resistance at up to 120 °C owing to the presence of a favorable interconnected network structure, strong surface tension, and capillary forces. The materials also exhibited high durability after 50 thermal cycles with a high latent heat retention capacity (>98%). Because of such thermal properties, the application scope of composite PCMs can be extended to the development of various human comfort thermal management systems.
Bibliographical noteFunding Information:
This work is supported by the Korea Agency for Infrastructure Technology Advancement(KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant: 21PIYR-B153494-03).
© 2021 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering