Characterization of novel lamellar porous Ti3SiC2 as shape-stabilized high-temperature phase change materials composites for durable enhancement thermal storage properties

Abstract

In pursuit of leveraging porous media for high-temperature phase change materials (PCMs) to enhance the overall thermal conductivity and encapsulation performance of PCMs, this study delves into the corrosion behavior of Ti3SiC2 with a lamellar porous structure in different corrosive environments at both high and low temperatures. By manipulating the solid content to modify the porous structure, the investigation probes the corrosion phenomena and anti-corrosion mechanisms across various porous configurations. The results reveal that F ions exert the most extensive structural degradation on Ti3SiC2. Based on these insights, a successful fabrication of a molten salt phase change composite material, Ti3SiC2/KCl-NaCl, boasting a lamellar structure was achieved. With an increase in solid content, the thermal conductivity escalates from 6.13 to 9.27 W/(m∙K), tripling the heat conductivity of pure KCl-NaCl. However, this also leads to a reduction in latent heat from 126.7 J/g to 46.2 J/g. Consequently, the phase change energy storage performance of PCM prepared by sample 2 emerges as exceptionally commendable. Following 200 thermal cycles on the composite PCM, no discernible structural damage was observed, albeit a slight performance decline. Hence, the lamellar Ti3SiC2/KCl-NaCl structure not only boasts favorable phase change energy storage capabilities but also demonstrates an extended service life.