材料科学
热能储存
复合数
石墨
相变
热的
聚乙二醇
相变材料
复合材料
储能
相(物质)
热能
聚乙烯
化学工程
工程物理
热力学
功率(物理)
物理
化学
有机化学
工程类
作者
Kening Yan,Yanhui Feng,Lin Qiu
出处
期刊:Solar Energy
[Elsevier]
日期:2024-04-01
卷期号:272: 112477-112477
被引量:3
标识
DOI:10.1016/j.solener.2024.112477
摘要
Compared with other energy storage materials, phase change materials (PCMs) are drawing widespread attention because of their high enthalpy and low temperature change. However, its low thermal conductivity, low photo/electro-thermal conversion characteristics, phase separation and easy leakage are still urgent problems. In this work, expanded graphite/polyethylene glycol (EG/PEG) composites were prepared based on physical adsorption method, the relationship between the mass percentage of EG and the microstructure, phase transition properties (phase change enthalpy, supercooling degree) and energy conversion properties was studied. The composite PCM exhibits exceptional thermal conductivity (2.48 W·m−1·K−1, 7 folds greater than that of PEG) and outstanding melting enthalpy (161.4 J/g). The thermal conductivity of the EG/PEG composites is almost constant versus temperature over measured temperature range (26 ℃∼60 ℃). The energy conversion capacities (photo/electro-thermal conversion) increase as the expanded graphite mass fraction increases. The prepared composite PCM obviously overcomes the shortcomings of the pure polyethylene glycol, and highlights enormous application in the domains of multi-physical energy conversion and premium quality power absorption.
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