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Graphene oxide aerogel thermochemical heat storage composite material and preparation method thereof

A graphene aerogel, graphene hydrogel technology, applied in chemical instruments and methods, heat exchange materials and other directions, can solve the problem of low load rate of hydrated inorganic salts and reduced energy storage density of thermochemical heat storage composite materials and other problems to achieve the effect of overcoming the uneven distribution of hydrated inorganic salts

Active Publication Date: 2019-06-25
TONGJI UNIV
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Problems solved by technology

However, due to the low loading rate of hydrated inorganic salts, a large amount of carrier material is introduced, resulting in a greatly reduced energy storage density of thermochemical heat storage composites.

Method used

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  • Graphene oxide aerogel thermochemical heat storage composite material and preparation method thereof
  • Graphene oxide aerogel thermochemical heat storage composite material and preparation method thereof
  • Graphene oxide aerogel thermochemical heat storage composite material and preparation method thereof

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preparation example Construction

[0033] A preparation method of graphene oxide airgel thermochemical heat storage composite material, comprising:

[0034] Preparation of graphene oxide (GO) aqueous solution: graphite oxide was prepared by the improved Hummers method, and a graphite oxide aqueous solution with a concentration of 3-10 mg / mL was prepared, and 3-10 mg / mL was obtained after ultrasonic stripping at a frequency of 20-60 kHz for 1-2 hours. Graphene oxide aqueous solution;

[0035] Preparation of MgCl 2 ·6H 2 O-graphene oxide hydrogel composite: measure GO aqueous solution 30-60mL, press MgCl 2 ·6H 2 The different mass percentages of O in the complex are 50-90wt%, and the corresponding MgCl is weighed 2 ·6H 2 O, the two are mixed evenly, and the hydrothermal reaction is carried out at 50-100°C for 10-18 hours, and MgCl is obtained after cross-linking and self-assembly 2 ·6H 2 O-graphene oxide hydrogel composite (abbreviated as GOH-M);

[0036] Preparation of MgCl 2 ·6H 2 O-graphene oxide air...

Embodiment 1

[0040] Graphite oxide was prepared by the improved Hummers method, and a graphite oxide aqueous solution with a concentration of 5 mg / mL was prepared, and a 5 mg / mL graphene oxide aqueous solution was obtained after 40 kHz ultrasonic stripping for 2 hours. by MgCl 2 ·6H 2 The mass percentage of O in the composite is 50wt%, and the corresponding MgCl is weighed 2 ·6H 2 O was dispersed in 50 mL of GO aqueous solution, stirred evenly, poured into the reaction kettle, and heated at 90 °C for 12 h to obtain the GOH-M50 complex. GOH-M50 was pre-frozen at -45°C for 2 hours, and vacuum freeze-dried for 72 hours under the conditions of vacuum degree of 2Pa and cold hydrazine temperature of -45°C to obtain the GOA-M50 complex.

[0041] figure 1 and figure 2 They are the SEM image and TEM image of GOA-M50 respectively. It can be seen from the figure that MgCl 2 ·6H 2 O particles are uniformly dispersed on the GOA sheet, and the size reaches 200-300nm. image 3 MgCl in GOA-M50 2...

Embodiment 2

[0043] Graphite oxide was prepared by the improved Hummers method, and a graphite oxide aqueous solution with a concentration of 5 mg / mL was prepared, and a 5 mg / mL graphene oxide aqueous solution was obtained after 20 kHz ultrasonic stripping for 2 hours. by MgCl 2 ·6H 2 The mass percentage of O in the complex is 60wt%, and the corresponding MgCl is weighed 2 ·6H 2 O was dispersed in 50 mL GO aqueous solution, stirred evenly, poured into the reaction kettle, and heated at 80 °C for 12 h to obtain the GOH-M60 complex. GOH-M60 was pre-frozen at -40°C for 2 hours, kept at a vacuum of 2 Pa, and cooled to -45°C, and lyophilized in vacuum for 72 hours to obtain the GOA-M60 complex.

[0044] GO prepared in this example, MgCl 2 ·6H 2 The XRD diffraction pattern of O and GOA-M60 composite is as follows Figure 4 , where a represents the XRD diffraction pattern of GO, and the two curves in b are MgCl 2 ·6H 2 XRD diffraction pattern of O and GOA-M60 composite. It can be seen fr...

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Abstract

The invention relates to a graphene oxide aerogel thermochemical heat storage composite material and a preparation method thereof. The method comprises the following steps: 1) ultrasonically strippinga graphite oxide aqueous solution to obtain a graphene oxide aqueous solution; 2) uniformly mixing the graphene oxide aqueous solution with MgCl2.6H2O, and carrying out hydrothermal crosslinking self-assembly to obtain MgCl2.6H2O-graphene oxide hydrogel compound; and 3) carrying out vacuum drying treatment on the MgCl2.6H2O-graphene oxide hydrogel compound to obtain the graphene oxide aerogel thermochemical heat storage composite material. Compared with the prior art, graphene oxide aerogel is used as a carrier; a large specific surface area is provided for MgCl2.6H2O crystallization, so thatthe problem that hydrated inorganic salt is easy to agglomerate can be effectively solved, and the MgCl2.6H2O-graphene oxide hydrogel compound has the advantages of high energy storage density, adjustable reaction temperature, good dispersity and the like. The composite material has a huge application space in the field of medium and low temperature thermochemical heat storage.

Description

technical field [0001] The invention relates to the field of airgel composite materials, in particular to a graphene oxide airgel thermochemical heat storage composite material and a preparation method thereof. Background technique [0002] Energy is the basis of human survival. With the improvement of people's living standards, the demand for energy continues to increase, and the environmental pollution caused by it, such as the greenhouse effect, is also increasing. The development and utilization of new clean and renewable resources, such as wind energy, geothermal energy, ocean energy, nuclear energy, and solar energy, has become a research hotspot. However, there are some limitations in the utilization of new energy sources, such as the instability of wind energy, the safety of nuclear energy, and the mismatch between time and space requirements of solar energy, which greatly reduces energy utilization. In order to use energy more rationally, efficiently and safely, va...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 张东周红
Owner TONGJI UNIV
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