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Carbon-based phase change energy storage material for solar direct photo-thermal conversion and preparation method of carbon-based phase change energy storage material

A phase-change energy storage material and technology of phase-change materials, applied in the field of carbon-based phase-change energy storage materials and their preparation, can solve the problems of inability to have both light-to-heat conversion efficiency and high thermal conductivity to prevent liquid leakage, and achieve excellent anti-corrosion Liquid leakage ability, highlighting the effect of light-to-heat conversion performance

Pending Publication Date: 2022-07-29
XINZHOU TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the photothermal conversion phase change energy storage materials are prepared by adding a single type of carbon-based filler (graphene , nano-carbon black, graphite nano-flakes, carbon nanotubes, expanded graphite, carbon fibers, etc.), which cannot combine high-efficiency light-to-heat conversion efficiency, high thermal conductivity, and outstanding liquid leakage prevention capabilities

Method used

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  • Carbon-based phase change energy storage material for solar direct photo-thermal conversion and preparation method of carbon-based phase change energy storage material
  • Carbon-based phase change energy storage material for solar direct photo-thermal conversion and preparation method of carbon-based phase change energy storage material
  • Carbon-based phase change energy storage material for solar direct photo-thermal conversion and preparation method of carbon-based phase change energy storage material

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A novel photothermal conversion phase change energy storage material, the preparation method of which is as follows:

[0045]Step 1: Immerse the carbon-based high thermal conductivity porous material (specifically, expanded graphite) in a completely melted organic phase change material (specifically, paraffin (C 35 H 72 )), placed in a vacuum oven with a vacuum degree of -0.05MPa, the vacuum impregnation time was set to 8h, and the impregnation temperature was set to 20°C above the phase transition point of the organic phase change energy storage material; in this step, Carbon-based high thermal conductivity porous materials will significantly improve the thermophysical properties and liquid leakage resistance of pure organic phase change energy storage materials due to their inherent microporous structure and high thermal conductivity; the quality of carbon-based high thermal conductivity porous materials and organic phase change materials The percentage is 25:75;

...

Embodiment 2

[0055] According to Example 1, the difference is that the mass ratio between the phase change matrix, the carbon-based high thermal conductivity porous material and the carbon-based photothermal conversion enhancer is different, and the mass percentage of the carbon-based high thermal conductivity porous material and the organic phase change material is different. is 25:75, and the mass percentage of the thermally conductive enhanced phase change material particles and the carbon-based photothermal conversion enhancer is 85:15.

[0056] The scanning electron microscope image of the obtained carbon-based phase change energy storage material is as follows image 3 As shown, it can be seen that with the increase of the quality of the carbon-based photothermal conversion enhancer, the coating amount of the carbon-based photothermal conversion enhancer on the surface of the thermal conductivity enhanced phase change material particles increases to a certain extent.

[0057] The the...

Embodiment 3

[0060] According to Example 1, the difference is that the mass ratio between the phase change matrix, the carbon-based high thermal conductivity porous material and the carbon-based photothermal conversion enhancer is different, and the mass percentage of the carbon-based high thermal conductivity porous material and the organic phase change material is different. is 25:75, and the mass percentage of the thermally conductive enhanced phase change material particles and the carbon-based photothermal conversion enhancer is 80:20.

[0061] The scanning electron microscope image of the obtained carbon-based phase change energy storage material is as follows Figure 4 As shown, it can be seen that with the continuous increase of the quality of the carbon-based photothermal conversion enhancer, the coating amount of the carbon-based photothermal conversion enhancer on the surface of the thermally conductive enhanced phase change material particles also continues to increase.

[0062...

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Abstract

The invention provides a carbon-based phase change energy storage material for solar direct photo-thermal conversion and a preparation method, and belongs to the technical field of phase change composite materials. The heat-conducting reinforced phase-change material comprises heat-conducting reinforced phase-change material particles and a carbon-based photothermal conversion enhancer coating the surfaces of the heat-conducting reinforced phase-change material particles, and the mass percentage of the heat-conducting reinforced phase-change material particles to the carbon-based photothermal conversion enhancer is (75-95): (5-25); the heat-conducting reinforced phase-change material particles comprise an organic phase-change material matrix and a carbon-based high-heat-conductivity porous material. According to the invention, the organic phase change material matrix, the carbon-based high-thermal-conductivity porous material and the carbon-based photothermal conversion enhancer are combined through the specific coating structure, so that the effects of enhancing the thermal conductivity and improving the photothermal conversion capability of the two carbon-based materials on the phase change matrix can be fully exerted respectively; on the premise of ensuring the high thermal conductivity and excellent liquid leakage prevention capability of the carbon-based phase change energy storage material, the outstanding photothermal conversion performance is also endowed.

Description

technical field [0001] The invention relates to the technical field of phase-change composite materials, in particular to a carbon-based phase-change energy storage material used for direct photothermal conversion of solar energy and a preparation method thereof. Background technique [0002] Solar energy is the most widely distributed and clean energy source on earth. After carbon emission reduction has become the consensus of energy development in all countries in the world, solar energy conversion has become a frontier field that has attracted much attention. At present, solar energy is often used for photothermal conversion, photoelectric conversion, and solar hydrogen production. Among them, direct photothermal conversion is the most efficient way of utilizing solar energy. [0003] The photothermal conversion material can directly convert the received solar radiation into thermal energy due to its own unique photothermal properties. However, due to the inherent trans...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 罗晓航顼兴宇
Owner XINZHOU TEACHERS UNIV
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