SiO2 hydrophilic modification of expanded graphite to fabricate form-stable ternary nitrate composite room temperature phase change material for thermal energy storage

Chen, Wei-Cheng; Liang, Xianghui; Wang, Shuangfeng; Ding, Yifan; Gao, Xuenong; Zhang, Zhengguo; Fang, Yutang

doi:10.1016/j.cej.2020.127549

Cited by 62 publications

(28 citation statements)

References 30 publications

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“…According to their sources, PCMs can be divided into inorganic PCMs and organic PCMs. − Among them, organic PCMs are widely used in waste heat recovery due to their advantages of high energy storage density, excellent thermochemical stability, low corrosion, environment-friendliness, and economy. − However, most organic PCMs are typical “solid–liquid” PCMs, and they face problems such as leakage and slow charging/exothermic rate in practical applications . Due to the strong capillary adsorption, the porous materials (grapefruit peel, melamine foam, graphene, − expanded graphite, etc.) have been widely used to encapsulate the organic PCMs to prevent their leakage during the phase change process .…”

Section: Introductionmentioning

confidence: 99%

“…12−14 However, most organic PCMs are typical "solid−liquid" PCMs, and they face problems such as leakage and slow charging/exothermic rate in practical applications. 15 Due to the strong capillary adsorption, the porous materials (grapefruit peel, 16 melamine foam, 17 graphene, 18−21 expanded graphite, 22 etc.) have been widely used to encapsulate the organic PCMs to prevent their leakage during the phase change process.…”

Section: Introductionmentioning

confidence: 99%

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High Thermal Conductivity and Mechanical Strength Phase Change Composite with Double Supporting Skeletons for Industrial Waste Heat Recovery

Gong

Sheng

et al. 2021

ACS Appl. Mater. Interfaces

100

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The “solid–liquid” leakage and low thermal conductivity of organic phase change materials limit their wide range of applications. In this paper, a novel carbon fiber/boron nitride (CF/BN)-based nested structure was constructed, and then, a series of poly(ethylene glycol) (PEG)-based phase change composites (PCCs) with high thermal conductivity and mechanical strength were prepared via the simple vacuum adsorption technology by employing the CF/BN nested structure as the heat conduction path and supporting material and the in situ obtained cross-linking epoxy resin as another supporting material. The thermal conductivity of the obtained PCC is as high as 0.81 W/m K, which is 7.4 times higher than that sample without the CF/BN nested structure. The support of the double skeletons confers the obtained PCCs with excellent mechanical strength. Surprisingly, there is not any deformation for PCCs under the pressure of 128.5 times its own weight during the phase change process. In addition, the phase change enthalpy of the obtained PCC is as high as 107.9 J/g. All the results indicate that the obtained PEG-based PCCs possess huge application potential in the field of industrial waste heat recovery.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Thermal Conductivity and Mechanical Strength Phase Change Composite with Double Supporting Skeletons for Industrial Waste Heat Recovery

Gong

Sheng

et al. 2021

ACS Appl. Mater. Interfaces

100

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“…TEG had also been used widely as a phase-changing material, 66,138 fire retardant, 139,140 etc. due to its excellent thermal stability.…”

Section: Challenges and Future Prospectsmentioning

confidence: 99%

Recent trends in the applications of thermally expanded graphite for energy storage and sensors – a review

et al. 2021

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“…EG achieved through such expansion has a highly porous ( Figure 1 d,e), lightweight structure with a very low density (0.002–0.02 g

cm −3 ) and exhibits high mechanical strength (10 MPa), thermal conductivity (25–470 W

m −1

K −1 ), and electrical conductivity (10 6 –10 8 S

cm −1 ) [ 31 ]. As a result, EG has emerged as a promising material with applications such as flame retardancy [ 32 ], phase−change material [ 33 , 34 ], electrodes [ 35 , 36 ], electrochemical sensors [ 37 ], fuel cells [ 38 , 39 ], batteries [ 40 , 41 ] and supercapacitors [ 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Large Enhancement in Thermal Conductivity of Solvent−Cast Expanded Graphite/Polyetherimide Composites

et al. 2022

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We demonstrate in this work that expanded graphite (EG) can lead to a very large enhancement in thermal conductivity of polyetherimide−graphene and epoxy−graphene nanocomposites prepared via solvent casting technique. A k value of 6.6 W⋅m−1⋅K−1 is achieved for 10 wt% composition sample, representing an enhancement of ~2770% over pristine polyetherimide (k~0.23 W⋅m−1⋅K−1). This extraordinary enhancement in thermal conductivity is shown to be due to a network of continuous graphene sheets over long−length scales, resulting in low thermal contact resistance at bends/turns due to the graphene sheets being covalently bonded at such junctions. Solvent casting offers the advantage of preserving the porous structure of expanded graphite in the composite, resulting in the above highly thermally conductive interpenetrating network of graphene and polymer. Solvent casting also does not break down the expanded graphite particles due to minimal forces involved, allowing for efficient heat transfer over long−length scales, further enhancing overall composite thermal conductivity. Comparisons with a recently introduced effective medium model show a very high value of predicted particle–particle interfacial conductance, providing evidence for efficient interfacial thermal transport in expanded graphite composites. Field emission environmental scanning electron microscopy (FE−ESEM) is used to provide a detailed understanding of the interpenetrating graphene−polymer structure in the expanded graphite composite. These results open up novel avenues for achieving high thermal conductivity polymer composites.

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SiO2 hydrophilic modification of expanded graphite to fabricate form-stable ternary nitrate composite room temperature phase change material for thermal energy storage

Cited by 62 publications

References 30 publications

High Thermal Conductivity and Mechanical Strength Phase Change Composite with Double Supporting Skeletons for Industrial Waste Heat Recovery

High Thermal Conductivity and Mechanical Strength Phase Change Composite with Double Supporting Skeletons for Industrial Waste Heat Recovery

Recent trends in the applications of thermally expanded graphite for energy storage and sensors – a review

Large Enhancement in Thermal Conductivity of Solvent−Cast Expanded Graphite/Polyetherimide Composites

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