Simple <i>in situ</i> synthesis of SiC nanofibers on graphite felt as a scaffold for improving performance of paraffin-based composite phase change materials

Li, Xiao; Wang, Hao; Yang, Xuening; Huang, Zhaohui; Ma, Bin

doi:10.1039/d1ra08437b

Cited by 11 publications

(3 citation statements)

References 50 publications

(52 reference statements)

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“…KH560 and PGO-CTAB) were gradually melted as test time goes on and almost wholly melted at 1800 s. However, with the encapsulation in biochars, PGO-CTAB/CS6 PCMs perform better leakage resistance with excellent shape-stability, which was mainly due to the capillarity, strong surface tension, and hydrogen bond interaction of the microstructure of biochars towards PEG. Among them, PGO-CTAB/CS6(5) shows the best leak resistance [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

et al. 2023

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In recent years, phase change materials (PCMs) have been widely used in waste heat utilization, buildings, and solar and wind energy, but with a huge limitation from the low thermal conductivity, photothermal conversion efficiency, and low latent heat. Organic PCMs are eyecatching because of its high latent heat storage capability and reliability, but they still suffer from a lack of photothermal conversion and sharp stability. Here, we prepared sharp-stable PCMs by establishing a carbon material frame system consisting of graphene oxide (GO) and biochar. In particular, surfactants (CTAB, KH-560 and KH-570) were employed to improve the dispersity of GO in PEG. The differential scanning calorimetry results shows that the latent heat of PEG modified by CTAB grafted GO (PGO-CTAB) was the highest (191.36 J/g) and increased by 18.31% compared to that of pure PEG (161.74 J/g). After encapsulation of PGO-CTAB in biochar, the obtained composite PCM with the amount of biochar and PGO-CTAB in weight ratio 4:6 (PGO-CTAB/CS6(6)) possesses relatively high latent heat 106.51 J/g with good leak resistance and thermal stability, and with obviously enhanced thermal conductivity (0.337 W/(m·K)) and photothermal conversion efficiency (77.43%), which were higher than that of PEG6000 (0.325 W/(m·K), 44.63%). The enhancement mechanism of heat transfer and photothermal conversion on the composite PCM is discussed.

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Section: Resultsmentioning

confidence: 99%

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

et al. 2023

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“…The low TC values of pristine salts (< 1 W m −1 K −1 , Figure 1 ) have been enhanced by various methods, yielding TC values ranging from 0.2–3 W m −1 K −1 for ceramic‐based systems [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ] and up to 9 W m −1 K −1 for carbon‐based systems (Figure 1 and Table S1 , Supporting Information). [ 55 , 56 , 57 , 58 , 59 , 60 ] As expected, an increase in the concentration of filler (graphite in this case) was found to enhance the TC of the salt composite (Figure 1 ).…”

Section: Introductionmentioning

confidence: 99%

Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Lavi,

Ohayon‐Lavi,

Leibovitch

et al. 2023

Global Challenges

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Renewable energy technologies depend, to a large extent, on the efficiency of thermal energy storage (TES) devices. In such storage applications, molten salts constitute an attractive platform due to their thermal and environmentally friendly properties. However, the low thermal conductivity (TC) of these salts (<1 W m−1 K−1) downgrades the storage kinetics. A commonly used method to enhance TC is the addition of highly conductive carbon‐based fillers that form a composite material with molten salt. However, even that enhancement is rather limited (<9 W m−1 K−1). In this study, the partial exfoliation of graphite to graphene nanoplatelets (GnP) in a molten salt matrix is explored as a means to address this problem. A novel approach of hybrid filler formation directly in the molten salt is used to produce graphite–GnP–salt hybrid composite material. The good dispersion quality of the fillers in the salt matrix facilitates bridging between large graphite particles by the smaller GnP particles, resulting in the formation of a thermally conductive network. The thermal conductivity of the hybrid composite (up to 44 W m−1 K−1) is thus enhanced by two orders of magnitude versus that of the pristine salt (0.64 W m−1 K−1).

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“…The main function of these respective encapsulation methods is to either wrap the PCM core with a shell, or utilize physical attraction or chemical bonding between the PCM and the supporting matrix to prevent the liquid PCM from leaching out during a phase transition. On the other hand, to mitigate low thermal conductivity, conductive nanoparticles or phases such as graphite, [17] carbon nanotubes, [18] silicon carbide (SiC) [19] and silica (SiO 2 ) [20] can be added to the PCM mixture or in its encapsulation matrix. [21] While nucleating agents or thickening agents are commonly be employed to reduce the effects of supercooling.…”

Section: Introductionmentioning

confidence: 99%

Recent advancement in the development of silicon‐based phase change materials

Yun Debbie Soo,

Min Regine See,

et al. 2023

ChemistrySelect

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Phase change materials (PCMs) have been widely recognized as efficient solutions for thermal management across various industries, including logistics, construction, electronics, and others. Nevertheless, these materials encounter challenges such as leakage, poor thermal conductivity, and supercooling. To address these challenges, a comprehensive examination was conducted on the recent advancements pertaining to silicon‐based materials. These studies include their application as high temperature PCMs, as encapsulation matrices, and their integration as additives to enhance material properties. Aluminum–silicon (Al−Si) alloys offer a viable thermal management solution for high‐temperature applications, such as those found in car batteries. Silicon dioxide (SiO2), silicon carbide (SiC), and silicate‐based minerals have demonstrated the ability to synergistically encapsulate PCMs to prevent leakage, enhance thermal conductivity, and mitigate supercooling. However, the efficacy of these strategies in reducing supercooling varies, and a considerable number of studies have reported an exacerbation. Therefore, appropriate material selection and fine tuning for formulation are necessary. This review critically assesses silicon‐based materials as a component of PCM composite that have been developed over the years. Also, it presents an academic analysis of the selection of silicon‐based materials and the design strategy for PCM composites to optimize PCM formulations according to specific desired properties.

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Simple in situ synthesis of SiC nanofibers on graphite felt as a scaffold for improving performance of paraffin-based composite phase change materials

Abstract: The composite phase change material has excellent thermal properties, good photo-thermal conversion efficiency and flexible design in size, which produces a type of material for applications in solar and buildings energy storage.

Cited by 11 publications

References 50 publications

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

Effect of GO on the Structure and Properties of PEG/Biochar Phase Change Composites

Thermally Conductive Molten Salt for Thermal Energy Storage: Synergistic Effect of a Hybrid Graphite‐Graphene Nanoplatelet Filler

Recent advancement in the development of silicon‐based phase change materials

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