基于棕榈酸-硬脂酸/膨胀石墨定形复合相变储能材料的制备与表征

doi:10.11896/cldb.22030005

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Abstract In this study, a new type of shape-stabilized phase change material (PCM), which is suitable for solar energy storage, was prepared using eutectic mixture of palmitic acid (PA) and stearic acid (SA) as the phase transition material and expanded graphite (EG) as the supporting material. The microstructural and thermal properties of the novel PCM are examined through different techniques. The optimum adsorption mass ratio of PA-SA and EG in composite was obtained as 8∶1, and the best stacking density was 800 kg/m³. And the thermal conductivity is proportional to the packing density. The PA-SA binary eutectic mixture is uniformly distributed in the honeycomb void structure of EG without any chemical reaction, and PCM does not leak even in the molten state. The DSC results reveal that the new composite has an excellent phase transition temperature (T_m: 54.34 ℃, T_f: 54.02 ℃) and a high latent heat (ΔH_m: 163.19 J/g,ΔH_f:161.65 J/g).The results of thermal cycling and TGA show that the composite PCM still maintains excellent thermal stability and reliability after 1 000 thermal cycles, and has a broad application prospect in the field of low-temperature energy storage.

Key words： composite phase change material palmitic acid stearic acid expanded graphite thermal property

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TB34

Fund:Finance Department of Inner Mongolia (KCBJ2018031,2017CXYD-2).

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	FANG Guihua
	ZHAO Maosen
	SUN Pengbo

Cite this article:

FANG Guihua,ZHAO Maosen,SUN Pengbo. Preparation and Characterization of a Shape-Stabilized Composite Phase Change Material Based on Palmitic-Stearic Acid/Expanded Graphite for Energy Storage[J]. Materials Reports, 2023, 37(20): 22030005-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030005 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22030005

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