Preparation method of graphene aerogel phase change energy storage material

A phase change energy storage material and graphene aerogel technology, which are applied in the preparation of graphene aerogel phase change energy storage materials and the preparation of new graphene aerogel phase change energy storage materials, and can solve the problem of matrix materials. effects, matrix leakage, degradation of thermophysical properties, etc.

Active Publication Date: 2020-01-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are three main problems in the use of phase change materials: the degradation of thermophysical properties during the cycle, the leakage of phase change materials from the matrix, and the effect of phase change materials on matrix materials.

Method used

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  • Preparation method of graphene aerogel phase change energy storage material
  • Preparation method of graphene aerogel phase change energy storage material
  • Preparation method of graphene aerogel phase change energy storage material

Examples

Experimental program
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Effect test

example 1

[0026] Graphene oxide and deionized water are uniformly mixed and stirred according to the mass ratio of 1:1000, then polyethylene glycol with a mass ratio of 10:1 to graphene oxide is added, stirred for 1 min, and poured into polytetrafluoroethylene hydrothermal The reaction kettle was kept at 90°C for 20 hours, and the samples were taken out and replaced with deionized water for 3 times, standing for 24 hours each time, then frozen at -20°C for 5 hours, and dried under vacuum for 12 hours to obtain The final graphene airgel polyethylene glycol phase change energy storage material. Sample picture as figure 1 As shown, it can be seen from the figure that the surface of the sample is relatively smooth, the overall color is black of graphene airgel, and the white polyethylene glycol phase change material is well filled in the porous skeleton of graphene airgel ; The density of the sample is 0.16g / cm 3 , The melting enthalpy is 127.6J / g.

example 2

[0028] Graphene oxide and ethanol are uniformly mixed and stirred according to a mass ratio of 20:1000, then stearic acid with a mass ratio of 100:1 to graphene oxide is added, stirred for 10 min, and poured into a polytetrafluoroethylene hydrothermal reaction kettle, Insulate at 240°C for 5 hours, take out the sample and replace it with deionized water 9 times, let it stand for 8 hours each time, freeze at -80°C for 48 hours, and vacuumize and dry for 36 hours to obtain the final graphene airgel Stearic acid phase change energy storage material. The density of this sample is 0.36g / cm 3 , The enthalpy of fusion is 346.7J / g.

example 3

[0030] Graphene oxide and acetone are uniformly mixed and stirred according to the mass ratio of 16:1000, then add paraffin wax with a mass ratio of 50:1 to graphene oxide, stir for 10 min, pour into a polytetrafluoroethylene hydrothermal reaction kettle, and heat at 240 The temperature was kept at ℃ for 9 hours, and the samples were taken out and replaced with ethanol 9 times, each time standing for 8 hours. Then put it in a CO2 supercritical reactor, and dry it for 8 hours in a high-pressure reactor with a reaction temperature of 70 °C, a pressure of 8 MPa, and a gas release rate of 5 L / min, so as to obtain the final graphene airgel paraffin phase transition energy storage materials. The density of this sample is 0.26g / cm 3 , SEM pictures such as figure 2 As shown, the sheet-like network structure of graphene airgel can be clearly seen from the left figure, and the paraffin phase change material can be well filled in the skeleton of graphene airgel from the right figure; ...

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Abstract

The invention belongs to the field of nano porous materials, and relates to a preparation method of a graphene aerogel phase change energy storage material. The preparation method comprises the following steps: mixing graphene oxide powder with a solvent, then adding a phase change material, obtaining a wet gel by adopting a hydrothermal reduction method, and finally carrying out washing, drying and other processes to finally prepare the phase change energy storage material with graphene aerogel as a structural framework and the uniformly distributed phase change material. The method has the advantages of simple preparation process, favorable leakage resistance, high latent heat, high heat conductivity and the like, and can easily implement large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a novel graphene airgel phase change energy storage material, in particular to a preparation method of a graphene airgel phase change energy storage material, and belongs to the technical field of nanoporous materials and phase change energy storage. Background technique [0002] With the rapid development of society and economy, people have an increasing demand for heat energy in areas such as heating and heat preservation, food drying, domestic hot water, etc., but the excess heat in the process of life and production is often regarded as waste heat. external environment. As one of my country's basic national policies, energy conservation and environmental protection play an important role in social development and progress, and it is particularly important to improve the utilization rate of heat energy. [0003] Phase change energy storage is currently the most popular energy storage method, that is,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 丁洁吴晓栋崔升沈晓冬蔡盈盈
Owner NANJING UNIV OF TECH
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