CN112480874A - Preparation method of sodium acetate trihydrate/expanded graphite composite phase change energy storage material - Google Patents

Preparation method of sodium acetate trihydrate/expanded graphite composite phase change energy storage material Download PDF

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CN112480874A
CN112480874A CN202011432592.6A CN202011432592A CN112480874A CN 112480874 A CN112480874 A CN 112480874A CN 202011432592 A CN202011432592 A CN 202011432592A CN 112480874 A CN112480874 A CN 112480874A
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expanded graphite
ctab
sodium acetate
energy storage
acetate trihydrate
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俞海云
刘晓磊
姚思远
刘贺
郑翠红
冒爱琴
林娜
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Anhui University of Technology AHUT
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Abstract

The invention provides a preparation method of a sodium acetate trihydrate/expanded graphite composite phase change energy storage material, and belongs to the technical field of materials. The composite phase change energy storage material is obtained by performing surface treatment on expanded graphite by using hexadecyl trimethyl ammonium bromide and then adsorbing sodium acetate trihydrate. According to the invention, the CTAB modified expanded graphite is adopted to change the surface wettability of the expanded graphite, so that the compatibility of the SAT and the expanded graphite is improved, and the adsorption rate, the maximum adsorption capacity, the adsorption stability and the thermal cycle stability of the SAT in the modified expanded graphite are improved. The composite phase-change material obtained by the invention has the characteristics of high phase-change material doping rate, fast adsorption process, good thermal conductivity, no leakage and stable thermal cycle performance, and can better meet the requirements of practical application compared with the existing SAT/EG composite phase-change energy storage material.

Description

Preparation method of sodium acetate trihydrate/expanded graphite composite phase change energy storage material
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a preparation method of a sodium acetate trihydrate/expanded graphite composite phase change energy storage material.
Background
Phase change energy storage materials have been used more and more widely in the field of thermal energy recovery and storage. However, the existing organic matter and hydrated salt phase change materials have the problem of low thermal conductivity in practical use. At present, the heat conduction of the phase-change material is mainly improved by adding a high-heat-conduction carrier into the phase-change material. The commonly used high heat conductivity carrier comprises various metal or inorganic substance ultrafine powder, carbon tubes, graphite powder, graphite flakes, expanded graphite and the like. However, the carriers often have the problems that the total heat storage capacity is reduced due to the fact that the adding amount of the carriers does not have phase change heat storage capacity, the difference between the density and the phase change material is large, the compatibility between the density and the phase change material is poor, the cycle service life of the final composite phase change material is short, and the like. In contrast, the expanded graphite is widely applied to the production and preparation of the high-thermal-conductivity composite phase-change material due to the characteristics of high thermal conductivity, large surface area, small density, stable property, low cost and the like. The expanded graphite is integrally non-polar, so that the adsorption of non-polar organic molecules is facilitated, and the expanded graphite is more applied to the improvement of the heat conduction of the organic phase change material.
In the improvement of the heat conduction of the inorganic hydrated salt phase-change material, the relatively low total adsorption amount and the relatively slow adsorption process of the phase-change material are caused on one hand because the relatively large difference between the compatibility of the expanded graphite and the hydrated salt leads to poor adsorbability; on the other hand, the obtained composite phase change material is easy to leak in the thermal cycle process, so that the performance is reduced quickly and the service life is short. Do Couto Aktay prepares the composite phase change material of nitrate and expanded graphite by an impregnation method and a compression method, and although the thermal conductivity of the material is greatly improved, the heat conductivity of the material is also shown to be changed after thermal cycling.
In the case where the compatibility between the expanded graphite and the inorganic hydrated salt is poor and the life is affected, it has been attempted to improve the compatibility by modifying the expanded graphite with a surfactantAnd (4) sex. The nonionic surfactants TX-100 and OP-10 are mainly reported at present. Siyu Zhou et al modified expanded graphite by TX-100 and then fused MgCl at 140 deg.C2·6H2And soaking the composite phase change energy storage material in O for 4 hours to obtain the composite phase change energy storage material with the highest adsorption mass fraction of 80.1%. ZHi-jun Duan et al modified the expanded graphite by OP-10 and then prepared CaCl by vacuum impregnation2·6H2The test result of the O/expanded graphite composite phase change energy storage material shows CaCl2·6H2The adsorption effect is best when the doping amount of O is 60 w%. Other reports have also chosen nonionic surfactants as the best choice for modification, but have focused primarily on hydrochloride and nitrate hydrate salts.
The inorganic hydrated salt sodium acetate trihydrate has large phase change latent heat of about 240J/g and melting temperature of about 58 ℃, and the reported heat conductivity coefficient of pure-phase sodium acetate trihydrate at different temperatures and in solid or liquid states is 0.4-0.7 W.m-1·K-1In the meantime. The heat conductivity is higher than that of the organic phase change material, but the practical application requirement is not reached. In patent CN201010149754.5, sodium acetate trihydrate, expanded graphite, disodium hydrogen phosphate dodecahydrate and carboxymethyl cellulose are used as raw materials to prepare the composite phase change energy storage material, but the thermal cycle performance of the material is not investigated. In a verification test, the formula provided by the patent is found to have leakage in the cycle use, so that the use effect is obviously influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of a sodium acetate trihydrate/expanded graphite composite phase-change energy storage material, so that the obtained composite phase-change energy storage material has no leakage, stable thermal cycle performance and easy industrial application.
The invention is realized by the following technical scheme.
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), Expanded Graphite (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps:
step (1): and (3) preparing CTAB modified expanded graphite. Weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring, and performing vacuum drying to obtain the CTAB modified expanded graphite.
Step (2): weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt;
and (3): weighing 1.5-1.9 g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the product.
Further, the ethanol in the step (1) is absolute ethanol.
Further, the expanded graphite in the step (1) is 50 meshes and has an expanded volume of 300 mL/g.
Further, in the step (3), the mass of the CTAB modified expanded graphite is 7.5% of that of the sodium acetate trihydrate.
Compared with the prior art, the invention has the following technical effects:
1. the CTAB modified expanded graphite changes the surface wettability of the expanded graphite, so that the compatibility of the SAT and the expanded graphite is improved, and the adsorption rate, the maximum adsorption capacity, the adsorption stability and the thermal cycle stability of the SAT in the modified expanded graphite are improved. Compared with the prior SAT/EG composite phase change energy storage material, the material can better meet the requirements of practical application.
2. The sodium acetate trihydrate/expanded graphite composite phase change energy storage material obtained by the invention has the characteristics of high doping rate, quick adsorption process, good thermal conductivity, no leakage and stable thermal cycle performance, has comprehensive performance superior to that of the related reports, and is easier for industrial application.
Drawings
FIG. 1 is a graph showing the comparison of the results of the leakage test after saturation adsorption of SAT with different proportions of EG, TX-EG and CTAB-EG.
Detailed Description
Example 1
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring for 10min at 3000r/min, and drying in a vacuum drying oven at 40 ℃ for 12 hours to obtain CTAB modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) weighing 1.5g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring at 100r/min for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material.
Example 2
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring for 10min at 3000r/min, and drying in a vacuum drying oven at 40 ℃ for 12 hours to obtain CTAB modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) weighing 1.6g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring at 100r/min for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material.
Example 3
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring for 10min at 3000r/min, and drying in a vacuum drying oven at 40 ℃ for 12 hours to obtain CTAB modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) weighing 1.7g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring at 100r/min for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material.
Example 4
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring for 10min at 3000r/min, and drying in a vacuum drying oven at 40 ℃ for 12 hours to obtain CTAB modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) weighing 1.8g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring at 100r/min for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material.
Example 5
A sodium acetate trihydrate/expanded graphite composite phase change energy storage material is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), Cetyl Trimethyl Ammonium Bromide (CTAB) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring for 10min at 3000r/min, and drying in a vacuum drying oven at 40 ℃ for 12 hours to obtain CTAB modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) weighing 1.9g of CTAB modified expanded graphite, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring at 100r/min for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material.
Comparative example 1 (adsorption comparative experiment):
the influence of pH value on the liquid absorption and adsorption performance of super absorbent resin poly (acrylate-acrylamide) by a tea bag method (Zhangyi et al, Nature science of Hunan Tan university, 2007,29(004):63-66.) was used to test the adsorption rate and the adsorption amount of unmodified expanded graphite (50 meshes, 300mL/g) (EG), polyethylene glycol octyl phenyl ether (TX-100) modified expanded graphite (50 meshes, 300mL/g) (TX-EG) and CTAB modified expanded graphite (50 meshes, 300mL/g) (CTAB-EG) on sodium acetate trihydrate under the same environment. The process is as follows: (1) weighing excessive SAT in a beaker, sealing, putting in an oven at 80 ℃, and heating to completely melt the SAT; (2) respectively wrapping 0.50g of EG, TX-EG or CTAB-EG by using a 200-mesh nylon net, tightening a rubber band, and respectively weighing the whole weight of the three tea bags; (3) putting the tea bags into the fully melted SAT, sealing, putting the tea bags into an oven at the temperature of 80 ℃, taking out the tea bags every 1 hour, draining, and weighing the three tea bags after adsorption. The difference between the front and rear weights of the tea bag was the amount of SAT adsorbed by 0.50g of support material within 1 hour, and the data is recorded in Table 1.
TABLE 1 adsorption data of EG, TX-EG, CTAB-EG on SAT over time
Figure BDA0002827096570000061
The data show that the saturation adsorption time of the expanded graphite modified by CTAB is shortest, the adsorption is complete in less than 1 hour, and meanwhile, the saturation adsorption capacity is the largest among the three, namely the EG mass ratio is the smallest (the three are 7.9%, 7.6% and 6.2% respectively), and the comprehensive performance is better than that of the former two.
Comparative example 2 (leak comparative test):
according to the result of comparative example 1, the EG mass ratio was increased based on the saturated adsorption mass ratio, and the leakage of the composite sample was tested. Samples adsorbing SAT with different proportions of EG are prepared according to the method of comparative example 1, the SAT is melted by heating and preserving heat for 30min in an oven at 80 ℃, a part of each sample is taken out and placed on A4 paper to stand for 2min, then the sample is taken out, and whether leakage and wetting marks exist on the paper is observed to judge whether the weight proportions of different supporting materials are minimum, so that the aim of complete leakage prevention can be achieved. The test results are shown in FIG. 1. In FIG. 1, the left and right sides are respectively a comparison of the sample after being placed on A4 paper for 2min after being heat-preserved at 80 ℃. As can be seen from the figure, when the CTAB-EG mass ratio reaches 7.5%, SAT leakage permeation traces are not observed on the paper, but EG and TX-EG respectively reach 9% and 8.5% and then have no leakage traces, which indicates that the CTAB-EG leakage prevention performance is the best among the three.
Comparative example 3 (comparative test for thermophysical properties after TX-100 modification):
the phase change energy storage material is prepared by compounding TX-100 modified expanded graphite and sodium acetate trihydrate, and is prepared from Sodium Acetate Trihydrate (SAT), expanded graphite (50 meshes, 300mL/g) (EG), polyethylene glycol octyl phenyl ether (TX-100) and disodium hydrogen phosphate Dodecahydrate (DSP) according to the following steps, proportions and reaction conditions. The preparation process comprises the following steps: (1) weighing 1g of TX-100, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing; mixing 10g of expanded graphite with the TX-100 solution, mechanically stirring at 3000r/min for 10min, and then placing in a vacuum drying oven at 40 ℃ for drying for 12 hours to obtain TX-100 modified expanded graphite; (2) weighing 20g of SAT and 1g of DSP, placing into a beaker, sealing, and placing into an oven at 80 ℃ for heat preservation to melt; (3) and (3) weighing 1.7g, 1.8g, 1.9g, 2.0 g and 2.1g of TX-100 modified expanded graphite respectively, quickly pouring the completely molten raw materials obtained in the step (2), mechanically stirring for 5min at 100r/min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain comparative samples TX-EG1, TX-EG2, TX-EG3, TX-EG4 and TX-EG5 respectively.
The hot-mass properties of the samples were measured and compared with those of the samples of examples 1 to 5 (CTAB-EG 1, CTAB-EG2, CTAB-EG3, CTAB-EG4 and CTAB-EG5 respectively), and the results are shown in Table 2. It can be seen from table 2 that the phase change energy storage material obtained by compounding TX and CTAB modified EG and SAT has slightly higher heat conduction TX series, slightly higher latent heat CTAB series, basically stable phase change temperature, and little difference between the thermal properties of the TX and CTAB modified EG and SAT.
Table 3 shows the comparison of latent heat data of the phase change energy storage material obtained by compounding TX and CTAB modified EG and SAT after 50 times of thermal cycles, and it can be seen that the latent heat CTAB series after the thermal cycles are slightly higher than that of the TX series.
According to the data in tables 1-3, the production and preparation process and the product performance of the product are comprehensively considered, and the CTAB modified expanded graphite composite sodium acetate trihydrate composite phase change energy storage material has more obvious advantages and can meet the requirements of industrial application.
TABLE 2 comparison of thermal-physical Properties of TX-modified EG/SAT and CTAB-modified EG/SAT at different ratios
Figure BDA0002827096570000081
Figure BDA0002827096570000091
TABLE 3 comparison of latent heat after 50 thermal cycles of TX-modified EG/SAT and CTAB-modified EG/SAT in different ratios
Figure BDA0002827096570000092
Description of the Performance test conditions:
in the present invention, a differential scanning calorimeter (model DSC500B, Shanghai Yinno precision instruments Co., Ltd.) was used to measure the phase transition temperature and the latent heat of phase transition of the prepared sample. Dry nitrogen was used as a purge gas during the measurement, and the flow rate was 50 mL/min. The calibration sample was high purity tin. Weighing 10mg of a powdery sample, putting the powdery sample into a crucible, covering the crucible, measuring, heating the crucible from room temperature to 90 ℃, cooling the crucible to room temperature at a heating and cooling rate of 3 ℃/min, and collecting data after measurement.
The thermal conductivity was measured by a thermal conductivity tester (model TC-3000L, Xian Xixi electronic technology Co., Ltd.) by a transient hot wire method. The specific measurement method is as follows: preparing a sample into a cake-shaped block, polishing the surface of the cake-shaped block by using 1200-mesh sand paper, tightly covering two same cake-shaped samples on the surface of the sensor, uniformly keeping the room temperature at 25 ℃, setting the measurement times at 12 times, and finally taking an average value to obtain the thermal conductivity coefficient of the material.
The sample is thermally cycled using a homemade thermal cycler. The method comprises the following specific steps: injecting a large amount of water into a container of a circulator, and controlling the water temperature to be 80 ℃; putting a sample to be tested into a glass test tube, sealing a rubber plug, and suspending the rubber plug on a sample platform of a circulating machine; and after the water in the container reaches the set temperature, controlling the sample platform to slowly move downwards through a program to ensure that the sample to be tested is immersed in hot water to be heated and melted, slowly raising the sample platform through the program after 30min to ensure that the sample is separated from the hot water, cooled and solidified at room temperature, repeating the steps for the set times in a reciprocating manner, taking out the sample after the circulation is finished, and testing the performance of the hot object.
The composite phase change heat storage material of the present invention is illustrated in detail by way of examples, which are provided only for illustrating the principles of the present invention and the embodiments thereof, and not for limiting the present invention, and various modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (4)

1. A preparation method of a sodium acetate trihydrate/expanded graphite composite phase change energy storage material is characterized by comprising the following steps:
(1) preparing CTAB modified expanded graphite: weighing 1g of CTAB, dissolving in 10mL of ethanol, adding 100mL of water, and uniformly mixing to obtain a CTAB solution; mixing 10g of expanded graphite with a CTAB solution, mechanically stirring, and performing vacuum drying to obtain CTAB modified expanded graphite;
(2) weighing 20g of sodium acetate trihydrate and 1g of disodium hydrogen phosphate dodecahydrate, putting into a beaker, sealing, and putting into an oven for heat preservation to melt;
(3) weighing 1.5-1.9 g of CTAB modified expanded graphite prepared in the step (1), quickly pouring the completely molten raw material obtained in the step (2), mechanically stirring for 5min, sealing, placing in an oven at 80 ℃ for 20min, and naturally cooling to obtain the CTAB modified expanded graphite.
2. The preparation method of the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material according to claim 1, wherein the preparation method comprises the following steps: the ethanol in the step (1) is absolute ethanol.
3. The preparation method of the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material according to claim 1, wherein the preparation method comprises the following steps: the expanded graphite in the step (1) is 50 meshes, and the expanded volume of the expanded graphite is 300 mL/g.
4. The preparation method of the sodium acetate trihydrate/expanded graphite composite phase-change energy storage material according to claim 1, wherein the preparation method comprises the following steps: in the step (3), the mass of the CTAB modified expanded graphite is 7.5% of that of the sodium acetate trihydrate.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN113372884A (en) * 2021-06-30 2021-09-10 中国地质大学（北京） Expanded graphite composite inorganic hydrated salt phase-change material and preparation method thereof
CN113637461A (en) * 2021-09-17 2021-11-12 中国地质大学（北京） Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase-change material
CN114539983A (en) * 2022-02-28 2022-05-27 华南理工大学 Hydrated salt thermochemical heat storage composite material and preparation method and application thereof

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CN101805591A (en) * 2010-04-19 2010-08-18 中国人民解放军理工大学工程兵工程学院 Inorganic hydrated salt expanded graphite composite phase-changing heat storage material and preparation method thereof
WO2015056260A1 (en) * 2013-10-15 2015-04-23 Enrad Ltd. Elastomer and/or composite based material for thermal energy storage
CN106947434A (en) * 2017-04-14 2017-07-14 华南理工大学 A kind of hydrated salt modified expanded graphite composite phase-change material and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN101805591A (en) * 2010-04-19 2010-08-18 中国人民解放军理工大学工程兵工程学院 Inorganic hydrated salt expanded graphite composite phase-changing heat storage material and preparation method thereof
WO2015056260A1 (en) * 2013-10-15 2015-04-23 Enrad Ltd. Elastomer and/or composite based material for thermal energy storage
CN106947434A (en) * 2017-04-14 2017-07-14 华南理工大学 A kind of hydrated salt modified expanded graphite composite phase-change material and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113372884A (en) * 2021-06-30 2021-09-10 中国地质大学（北京） Expanded graphite composite inorganic hydrated salt phase-change material and preparation method thereof
CN113637461A (en) * 2021-09-17 2021-11-12 中国地质大学（北京） Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase-change material
CN114539983A (en) * 2022-02-28 2022-05-27 华南理工大学 Hydrated salt thermochemical heat storage composite material and preparation method and application thereof
WO2023159996A1 (en) * 2022-02-28 2023-08-31 华南理工大学 Hydrated salt thermochemical heat storage composite material, preparation method therefor and application thereof

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