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 in

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

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

[0035] Prepare MgCl 2 ·6H 2 O-graphene oxide hydrogel complex: Measure 30~60mL of GO aqueous solution, press MgCl 2 ·6H 2 Different mass percentages of O in the compound 50-90wt%, weigh the corresponding MgCl 2 ·6H 2 O, the two are mixed uniformly, 50~100℃ hydrothermal reaction for 10~18h, MgCl is obtained after crosslinking and self-assembly 2 ·6H 2 O-graphene oxide hydrogel composite (abbreviated as GOH-M);

[0036] Prepare MgCl 2 ·6H 2 O-graphene oxide aerogel composite: MgCl 2 ·6H 2 O-graphene oxide hydrogel composite, pre-freeze at -40~-60℃ fo...

Example Embodiment

[0039] Example 1

[0040] Graphite oxide was prepared by an improved Hummers method, and an aqueous solution of graphite oxide with a concentration of 5 mg / mL was prepared. After 2 hours of ultrasonic peeling at 40 kHz, an aqueous solution of 5 mg / mL of graphene oxide was obtained. Press 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, and after stirring evenly, poured into the reactor, hydrothermally heated at 90°C for 12 hours to obtain the GOH-M50 complex. GOH-M50 was pre-frozen at -45°C for 2h, and lyophilized in vacuum for 72h under the conditions of a vacuum of 2Pa and a cold hydrazine temperature of -45°C to obtain the GOA-M50 complex.

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

Example Embodiment

[0042] Example 2

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

[0044] GO, MgCl prepared in this example 2 ·6H 2 The XRD diffraction pattern of O and GOA-M60 complex is as follows Figure 4 As shown, where a represents the XRD diffraction pattern of GO, and the two curves in b are MgCl 2 ·6H 2 XRD diffract...

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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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