高能存储密度n-二十烷/SAT/膨胀石墨复合相变材料性能研究

doi:10.19964/j.issn.1006-4990.2024-0649

Abstract

Abstract:

As a clean energy，solar energy has great potential in dealing with energy and environmental problems，but its utilization efficiency is limited due to its instability.The development of high⁃performance phase change material（PCM） composites is of great significance to solar thermal storage technology，which can effectively solve the problem of space⁃time mismatch between solar energy supply and demand.The purpose of this study is to prepare porous PCM with stable morphology，low undercooling and excellent photothermal conversion performance to solve the problem of space⁃time mismatch between solar energy supply and demand.The composite PCMs with porous expanded graphite as carrier material，n-eicosane as stabilizer and sodium acetate trihydrate（SAT） as phase change energy storage medium was prepared by melt mixing process.The results showed that the composite PCMs sample containing 3.3% expanded graphite had excellent performance.Its phase change enthalpy was 266.54 J/g，and the photothermal conversion efficiency was as high as 91.14%.There was almost no leakage at 90 ℃，and the supercooling degree was reduced to 2.50 ℃.It was also found that although EG had a negative effect on the phase change enthalpy，the composite PCMs remained between 225.71 J/g and 268.30 J/g due to the high enthalpy of SAT.In summary，the modification of SAT with EG and n-eicosane could effectively reduce supercooling，improve photothermal conversion efficiency，and provide a feasible solution for efficient storage and utilization of solar energy.

Key words: phase change material, solar thermal storage, expanded graphite, sodium acetate trihydrate, photothermal conversion efficiency

CLC Number:

TB33

LI Yajing. Study on properties of n-eicosane/SAT/expanded graphite composites with high energy storage density[J]. Inorganic Chemicals Industry, 2026, 58(1): 60-66.

Figures/Tables 6

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References 16

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试样		m（n-二十烷）/g	m（SAT）/ g	m（EG）/ g
n-二十烷/SAT复合材料（HPC）		3.000	12.000	0.000
PCMs	对照组1（S1）	2.950	11.800	0.250
	对照组2（S2）	2.925	11.700	0.375
	对照组3（S3）	2.900	11.600	0.500
	对照组4（S4）	2.875	11.500	0.625
	对照组5（S5）	2.850	11.400	0.750

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on properties of n-eicosane/SAT/expanded graphite composites with high energy storage density

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