A shape-stable capric acid @ porous carbon phase change composite with multifunctional response. (30th November 2022)

• Record Type: Journal Article
• Authors: Wang, Zekun; Zhang, Xiaoguang; Min, Xin; Fang, Minghao
• Is Part Of: Journal of energy storage. Volume 55:Part D(2022)
• Publication Date: 2022-11-30
• Subjects: Phase-change composite -- Porous carbon -- Capric acid -- Photothermal -- Electrothermal; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.105854
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: The development of a phase-change composite with a multifunctional response suitable for buildings is critical for minimizing building energy consumption and improving living comfort. In this study, porous carbon materials with high graphitization and excellent three-dimensional pore structures were synthesized using a simple method. The as-synthesized porous carbon and commercial capric acid with a phase transition temperature of 31 °C were combined by vacuum impregnation to form a phase-change composite with excellent shape stability and outstanding thermal properties. The latent heat of fusion in the first cycle of the phase-change composite was 127.1 J/g, and the enthalpy retention rate was as high as 79.24 % after 200 cycles. Meanwhile, the phase-change composite exhibits a photothermal and electrothermal multifunctional response. The photothermal conversion efficiencies of the composites were 55.79 % and 63.56 % under light intensities of 200 and 300 mW cm 2, respectively. Importantly, the phase-change composite with high electrical conductivity maintained an excellent electrothermal conversion performance when the applied voltage was 1.5 V at room temperature. Overall, the synthesized phase-change composite integrated high latent heat value, good cycling stability, and excellent electrical conductivity, demonstrating promising application prospects in the construction sector for increasing energy conservation and emission reduction. Graphical abstract: Here, a porous carbon support with high graphitization and excellent 3D pore structure based on sucrose carbon source was prepared by a simple preparation process. Porous carbon has very excellent compatibility with capric acid, and the loading efficiency for capric acid is about 80 %. The phase change composite has photothermal and electrothermal response capabilities, which makes it have a bright application prospect in energy-saving buildings. Unlabelled Image Highlights: Porous carbon with high graphitization and excellent 3D pore structure were obtained. CF-2/CA shows high encapsulation efficiency and excellent cycle stability. CF-2/CA exhibits excellent responsiveness in optical/electrical-thermal conversion.