Form-stable phase change material based on Na2CO3·10H2O-Na2HPO4·12H2O eutectic hydrated salt/expanded graphite oxide composite: The influence of chemical structures of expanded graphite oxide

Liu, Yushi; Yao, Yang

doi:10.1016/j.renene.2017.08.097

Cited by 121 publications

(27 citation statements)

References 49 publications

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“…Having a reduction of 98.8% supercooling degree, it can be concluded that the binary nucleation agents are super effective to stimulate the crystallization of CaCl 2 ·6H 2 O, and supercooling is no longer a concern in the modified PCM. The reduction of supercooling degree can be explained by the presence of oxygen-containing functional groups on the surface of GO which have been recognized as a potential platform in crystal attachment due to better wetting and adsorption [16]. According to the FT-IR results, a powerful absorption at 3413 cm −1 due to O–H stretching vibration could be seen in Figure 4a.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Jin

Tian

et al. 2018

Materials

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Although the inorganic salt hydrate phase change materials (PCMs) such as CaCl2·6H2O have promising potential for thermal energy storage in building application, the issue of supercooling has restricted their practical application. In this study, graphene oxide (GO) and SrCl2·6H2O as binary nucleation agents were used to modify CaCl2·6H2O and reduce its supercooling degree. Compared with pure CaCl2·6H2O, the incorporation of graphene oxide (GO)/SrCl2·6H2O reduced the supercooling degree to 0.3 °C significantly. In addition, the supercooling degree of modified CaCl2·6H2O after 200 thermal cycles was still much lower than that of non-modified CaCl2·6H2O. From the results of differential scanning calorimetry (DSC), the latent heat value and phase change temperature of the modified CaCl2·6H2O were 207.88 J/g and 27.6 °C, respectively. Aluminum capsules were used to encapsulate the modified PCM and placed inside the composite wallboard. The thermal performances of the composite wallboard with modified PCM were investigated using infrared thermography. Experimental results showed that the average temperature difference between the top and bottom surfaces of modified CaCl2·6H2O/wallboard composite after 1 h heating was kept around 15.8 °C, while it was 4.9 °C for the control wallboard. The above test results proved that the modified CaCl2·6H2O demonstrated good thermal performance and can be used in buildings to maintain thermal comfort.

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Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Jin

Tian

et al. 2018

Materials

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“…Among many synthesizing methods regarding form‐stable PCMs, such as the microencapsulation of PCM or the impregnation of PCM into porous matrix. The shell materials used to fabricate form‐stable PCMs include expanded graphite, low density polyethylene (LDPE), metal foam, silica, graphitic carbon nitride and montmorillonite nanosheets, etc. However, the form‐stable phase change materials still face some challenges concerning encapsulation: the fracture of the support shell caused by the volume stress generated by PCM during the phase transition and requirement of mechanical properties in some practical application, particularly in building structural materials .…”

Section: Introductionmentioning

confidence: 99%

Hydrate salt/self‐curing acrylic resin form‐stable phase change materials with enhanced surface stability and thermal properties via the incorporation of graphene oxide

Liu

Xie

et al. 2020

Int J Energy Res

Self Cite

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This work presents a novel eutectic hydrate salt/self-curing acrylic resin formstable phase change materials (PCMs) composite (EHS/SCR) with favorable form-stable performances for heat energy storage. Further, to improve the surface stability, latent heat and thermal conductivity of the EHS/SCR particles, graphene oxide (GO) used as cladding materials is incorporated onto the surface of the EHS/SCR particles to prepare the GO modified EHS/SCR phase change composite (EGO). The obtained results indicate that the GO-targeted absorption model has achieved the enhancements in stability and thermal properties of EHS/SCR while making use of GO in an efficient and economical way. To be specific, with the introduction of GO of only 1.07 wt%, the thermal conductivity of 0.508 W/mÁK is achieved, the value shows a significant rise of 128.6% compared with the EHS/SCR of 0.222 W/mÁK. Additionally, the maximum latent heat of EGO-6 is up to 90.4 J/g, which exhibits a 3.19-fold increase compared against that of the uncoated EHS/SCR. Moreover, the prepared EGO composite PCM remain a good thermal cycling reliability after 300 thermal cycles. This work provides a novel opportunity to improve the performance of form-stable PCM composites with an intelligent manufactureoriented pattern. K E Y W O R D Sgraphene oxide, hydrate salt, self-curing acrylic resin, surface stability, thermal conductivity

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“…Liu et al experimentally investigated the performance of form‐stable PCMs that developed by impregnation of eutectic hydrated salt into EG and EG oxide. The mechanisms and effects of the two porous mediums on thermal properties were thoroughly discussed . In short, EG is a superior addition that can counteract the disadvantages occurred in the inorganic material.…”

Section: Introductionmentioning

confidence: 99%

Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage

Han

Zhang

et al. 2019

Int J Energy Res

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Summary Composite expended graphite (EG)/Ba(OH)2·8H2O form‐stable phase change material (PCM) is prepared with porous adsorption method in this study to solve the problem of the leakage risk in the application process based on barium hydroxide octahydrate. In addition, the thermal properties and stability have been measured and verified. Thermal conductivity of each group composite material was enhanced by about two to four times, while the addition has little negative effect on the other properties. With microscopic features being characterized by scanning electron microscope (SEM), the experimental result demonstrates that the composite material with 7 wt% of EG is optimal to be a saturated state between two phases. After the thermal cyclings of 100, 300, and 500 times, thermal properties did not change dramatically, which can be used as an ideal material for solar thermal storage system within finite thermal cyclings. In order to simulate the operating condition of solar energy or waste heat storage, the composite material was encapsulated in the heat storage unit with pipe bundle, and heat storage/release experiences were performed to test the performance of the material and hot water supply. The results indicate that the composite material is qualified to storage and release sufficient heat. The experimental data can provide necessary technical reference for engineering design and effect prediction in practical application.

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Form-stable phase change material based on Na2CO3·10H2O-Na2HPO4·12H2O eutectic hydrated salt/expanded graphite oxide composite: The influence of chemical structures of expanded graphite oxide

Cited by 121 publications

References 49 publications

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Hydrate salt/self‐curing acrylic resin form‐stable phase change materials with enhanced surface stability and thermal properties via the incorporation of graphene oxide

Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage

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Form-stable phase change material based on Na2CO3·10H2O-Na2HPO4·12H2O eutectic hydrated salt/expanded graphite oxide composite: The influence of chemical structures of expanded graphite oxide

Cited by 121 publications

References 49 publications

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Hydrate salt/self‐curing acrylic resin form‐stable phase change materials with enhanced surface stability and thermal properties via the incorporation of graphene oxide

Preparation and application of composite EG/Ba(OH)2 ·8H2 O form-stable phase change material for solar thermal storage

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Preparation and application of composite EG/Ba(OH)₂ ·8H₂ O form-stable phase change material for solar thermal storage