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Graphitized graded porous carbon composite phase change energy storage material and preparation method thereof

A phase-change energy storage material and hierarchical porous technology, applied in chemical instruments and methods, carbon compounds, heat exchange materials, etc., can solve the problems of unfavorable phase-change material molecular movement, reduction of phase-change latent heat, poor energy storage effect, etc. , to achieve good heat conduction network channels, good heat storage effect, and increase energy storage density

Active Publication Date: 2019-02-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the three-dimensional porous carbons have a large number of macroporous structures or microporous structures. The macroporous structure has a poor adsorption effect on phase change materials, while the microporous structure is not conducive to the molecular movement of phase change materials. The latent heat of phase change is reduced to a certain extent, and the energy storage effect is poor

Method used

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  • Graphitized graded porous carbon composite phase change energy storage material and preparation method thereof
  • Graphitized graded porous carbon composite phase change energy storage material and preparation method thereof
  • Graphitized graded porous carbon composite phase change energy storage material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] (1) Weigh phenolic resin, aluminum isopropoxide and nano-magnesium oxide according to the mass ratio of 1:2:1, and add ethanol twice the mass of the mixture, ball mill at 300r / min for 3 hours, and then put them in a drying oven at 80°C to keep warm Distill off the solvent, put it into the atmosphere furnace after cooling to room temperature, pass in nitrogen, raise the temperature to 1100°C at a rate of 5°C / min, and keep it warm for 3 hours to obtain graphitized hierarchical porous carbon, which is taken out after cooling to room temperature for later use; The prepared graphitized hierarchical porous carbon has a specific surface area of ​​991m 2 / g, the pore volume is 2.53cm 3 / g, the average pore diameter is 3.2nm, and the Al content is 0.56wt%;

[0029] (2) Weigh the graphitized hierarchical porous carbon and stearic acid respectively according to the mass ratio of 0.5:9.5, add the graphitized hierarchical porous carbon to absolute ethanol and sonicate for 1 hour, t...

Embodiment 2

[0031] (1) Weigh coal tar pitch, ferrous sulfate and magnesium citrate according to the mass ratio of 1:1:1, and add 4 times the mass of n-butanol to the mixture, ball mill at 500r / min for 2 hours, and put them in a drying oven at 100°C Distill out the solvent by heat preservation, put it into the atmosphere furnace after cooling to room temperature, pass in argon gas, raise the temperature to 900°C at a rate of 10°C / min, and keep it warm for 4 hours to obtain graphitized hierarchical porous carbon. After cooling to room temperature, take it out for use ; The specific surface area of ​​the obtained graphitized hierarchical porous carbon is 759m 2 / g, the pore volume is 1.93cm 3 / g, the average pore diameter is 2.6 nm, and the Fe content is 0.32wt%;

[0032] (2) Weigh the graphitized hierarchical porous carbon and paraffin wax respectively according to the mass ratio of 1:9, add the graphitized hierarchical porous carbon to absolute ethanol for 1 h, then add paraffin and heat ...

Embodiment 3

[0034] (1) Weigh lignin, iron stearate and magnesium oxide according to the mass ratio of 1:2:3, and add dichloromethane 3 times the mass of the mixture, ball mill at 450r / min for 1.5h, and put it in a 70°C drying oven The solvent was distilled out by medium heat preservation, and then put into the atmosphere furnace after cooling to room temperature, and nitrogen gas was introduced, and the temperature was raised to 1000°C at a rate of 8°C / min, and kept for 3.5h to obtain graphitized hierarchical porous carbon, which was taken out after cooling to room temperature Standby; The specific surface area of ​​the prepared graphitized hierarchical porous carbon is 599m 2 / g, the pore volume is 2.01cm 3 / g, the average pore diameter is 3.3 nm, and the Mg content is 0.23wt%;

[0035](2) Weigh the graphitized hierarchical porous carbon and myristic acid respectively according to the mass ratio of 1.5:8.5, add the graphitized hierarchical porous carbon to absolute ethanol and sonicate ...

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Abstract

The invention discloses a graphitized graded porous carbon composite phase change energy storage material and a preparation method thereof. A carbon precursor with a low price, a graphitization catalyst and a pore-forming agent are used as raw materials and are treated through technologies including ball milling and mixing, carbonization and the like to prepare graphitized graded porous carbon; then the prepared graphitized graded porous carbon is used as a supporting material and is compounded with a phase change material to obtain the graphitized graded porous carbon composite phase change energy storage material. The porous carbon material prepared by the invention has a three-dimensional intercommunication graded porous network structure and a high graphitization degree; the sizing andpackaging of the phase change material are easy to realize; meanwhile, a good heat-conducting network channel can be provided and the heat transferring performance is enhanced; the porous carbon material is prepared by adopting an additive containing metal salt; in a preparation process, part of metal substances can be reduced by utilizing carbothermal reduction reaction and the heat conduction performance of the material is further increased, so that the composite phase change energy storage material with high heat conduction performance and good chemical stability is obtained.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a graphitized hierarchical porous carbon composite phase change energy storage material and a preparation method thereof. Background technique [0002] In the contemporary era of rapid industrial development, energy has become the main driving force for social and economic development. However, today's energy structure is still dominated by non-renewable energy such as fossil fuels, and due to problems such as limited reserves and over-development, energy depletion and environmental pollution have become important factors restricting social development. Therefore, it is necessary to find and develop clean and efficient renewable energy sources. Renewable energy and improving energy utilization have become an urgent task at present. Phase change materials are cheap and have high energy density. They can absorb or release a large amount of heat energy during the phase cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C01B32/205
CPCC09K5/063C01B32/205
Inventor 林起浪张夏兰罗慧君
Owner FUZHOU UNIV
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