Journal
JOURNAL OF ENERGY STORAGE
Volume 41, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102936
Keywords
Phase change materials; Lauric acid; Thermal conductivity; Ag-EG; Light-to-thermal conversion
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This study developed a novel composite phase change material based on lauric acid and Ag nanoparticles modified expanded graphite, which exhibits good thermal energy storage properties and light-to-thermal energy conversion efficiency, suitable for thermal energy management in solar energy harvesting systems and electric devices.
Phase change materials (PCMs) is an excellent performance candidate for thermal energy storage and utilization. However, low thermal conductivity and low light-to-thermal conversion efficiency of PCMs are the serious limitation factors for highly efficient energy storage and photothermal conversion. In this paper, we reported a novel composite PCM based on lauric acid (LA) as the PCM supported by Ag nanoparticles modified expanded graphite (Ag-EG). The composite PCM of Ag-EG/LA possessed good energy thermal storage properties, which melted at 47.2 degrees C with the latent heat of 129.5 J/g at the LA maximum loading of 70.2%. Meanwhile, based on the high thermal conductivity and local surface plasma resonance effect of Ag, the composite (Ag-EG/LA) exhibits improved thermal conductivities (2.85 W/(m.K)) and high light-to-thermal energy conversion efficiency (eta=81.2%). Moreover, the TGA and thermal cycles test results shown that Ag-EG/LA have good thermal stability and reliability. Hence, this novel composite of Ag-EG/LA could be potentially applicated in solar energy harvesting system and electric devices for thermal energy management.
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