High-orientation layered graphene aerogel phase change composite material and preparation method thereof

A phase-change composite material and graphene hydrogel technology, which is applied in the field of phase-change energy storage, can solve the problems of low density, graphene airgel is easily broken, and poor resilience, so as to improve thermal conductivity and excellent directional thermal conductivity Effect of performance, high energy storage characteristics

Active Publication Date: 2021-05-28
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of highly oriented layered graphene airgel phase change composite material and preparation method thereof, to solve the problems in the above-mentioned prior art, the layered graphene prepared by the multi-step hydrothermal method is adopted in the present invention Airgel has the excellent characteristics of high orientation, uniform sheet size, good resilience, and ultra-low density, which solves the technical problems of graphene airgel being easily broken and poor resilience

Method used

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  • High-orientation layered graphene aerogel phase change composite material and preparation method thereof
  • High-orientation layered graphene aerogel phase change composite material and preparation method thereof
  • High-orientation layered graphene aerogel phase change composite material and preparation method thereof

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Embodiment 1

[0041] Step 1. Take 10 mg / ml graphene oxide suspension in a polytetrafluoroethylene reactor, and use segmented heating to obtain a reduced graphene hydrogel. The whole process is divided into three steps, ① with 10°C / min to 180°C, after 120min of heat preservation, the sample is cooled to room temperature at a cooling rate of 5°C / min; ② After complete cooling, put it into a muffle furnace at 180°C for 120min, take out the sample and cool to room temperature; ③ After it is completely cooled, put it into a muffle furnace at 180°C for 120 minutes, and cool the sample to room temperature at a cooling rate of 5°C / min.

[0042] Step 2. Pre-freeze the hydrogel obtained in step 1 in the cold hydrazine of a freeze dryer to ensure that the ice crystals inside the hydrogel grow completely. The pre-freezing temperature is -10°C and the pre-freezing time is 2 hours.

[0043] Step 3. Take out the sample in step 2 and carry out vacuum freeze-drying to obtain a highly oriented layered airgel ...

Embodiment 2

[0050] Step 1. Take 10 mg / ml graphene oxide suspension in a polytetrafluoroethylene reactor, and use segmented heating to obtain a reduced graphene hydrogel. The whole process is divided into three steps, ① with 8°C / min to 180°C, after 100min of heat preservation, the sample is cooled to room temperature at a cooling rate of 3°C / min; ② After complete cooling, put it in a muffle furnace at 180°C for 100min, take out the sample and cool to room temperature; ③ After it is completely cooled, put it into a muffle furnace at 180°C for 100 minutes, and cool the sample to room temperature at a cooling rate of 3°C / min.

[0051] Step 2. Pre-freeze the hydrogel obtained in step 1 in the cold hydrazine of a freeze dryer to ensure that the ice crystals inside the hydrogel grow completely. The pre-freezing temperature is -15° C. and the pre-freezing time is 4 hours.

[0052] Step 3. Take out the sample in step 2 and carry out vacuum freeze-drying to obtain a highly oriented layered airgel m...

Embodiment 3

[0057] Step 1. Take 10 mg / ml graphene oxide suspension in a polytetrafluoroethylene reactor, and use segmented heating to obtain a reduced graphene hydrogel. The whole process is divided into three steps, ① with 10°C / min to 180°C, after holding for 60 minutes, the sample is cooled to room temperature at a cooling rate of 1°C / min; ② After complete cooling, put it into a muffle furnace at 180°C for 60 minutes, take out the sample and cool to room temperature; ③ After it is completely cooled, put it into a muffle furnace at 180°C for 60 minutes, and cool the sample to room temperature at a cooling rate of 1°C / min.

[0058] Step 2. Pre-freeze the hydrogel obtained in step 1 in the cold hydrazine of a freeze dryer to ensure that the ice crystals inside the hydrogel grow completely. The pre-freezing temperature is -20° C. and the pre-freezing time is 6 hours.

[0059] Step 3. Take out the sample in step 2 and carry out vacuum freeze-drying to obtain a highly oriented layered airgel ...

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Abstract

The invention discloses a high-orientation layered graphene aerogel phase change composite material and a preparation method thereof, and belongs to the field of phase change energy storage. The preparation method specifically comprises the steps of carrying out hydrothermal reaction on graphene oxide suspension in a segmented heating manner to obtain reduced graphene hydrogel; performing pre-freezing treatment; performing vacuum freeze drying to obtain a layered aerogel material; performing high-temperature carbonization or graphitization treatment; and compounding with a phase change material through vacuum impregnation. The graphene aerogel prepared by the method disclosed by the invention can be repeatedly rebounded and is not easy to break; and the highly-oriented layered graphene aerogel phase-change composite material prepared by the method has excellent oriented heat-conducting property, high energy storage property and good leakproof property, and has a wide application prospect in the field of phase-change energy storage.

Description

technical field [0001] The invention relates to the field of phase change energy storage, in particular to a highly oriented layered graphene airgel phase change composite material and a preparation method thereof. Background technique [0002] With the rapid development of society, the demand for energy is increasing day by day. It is a subject of great research significance to efficiently store and utilize limited energy. Phase-change materials can absorb and release latent heat according to environmental changes, can alleviate rapid temperature changes, store energy for recycling, and reduce excessive consumption of energy. According to different material properties, phase change materials can be divided into organic phase change materials and inorganic phase change materials. Inorganic phase change materials have high latent heat value, but are prone to phase separation and supercooling. Organic phase change materials have a wide range of sources and are cheap, but they...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/00
CPCC09K5/063B01J13/0091
Inventor 董志军董倩雯李轩科袁观明丛野朱辉李保六张江
Owner WUHAN UNIV OF SCI & TECH
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