Design and preparation of salt hydrate/ graphene oxide@SiO2/ SiC composites for efficient solar thermal utilization

Cui, Hongzhi; Wang, Pizhuang; Yang, Haibin; Xu, Tao

doi:10.1016/j.solmat.2021.111524

Cited by 26 publications

(6 citation statements)

References 54 publications

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“…The feasibility of PCM composites for practical applications is dictated by the rate at which heat can be stored or released. The intrinsically low thermal conductivities of salt hydrate PCMs can be enhanced by inclusion of thermally conductive fillers, such as metallic nanoparticles, − nano-silica, , and carbon nanomaterials. ,− To improve the heat transfer rates of our salt hydrate PCM printed composites, we introduced carbon black within the MNH-P inks for DIW (e.g., in place of some of the salt hydrate particles). Carbon black was chosen due to its widespread use in increasing the thermal conductivities of organic PCMs , and polymers, − which typically have poor thermal conductivities.…”

Section: Resultsmentioning

confidence: 99%

Printing Composites with Salt Hydrate Phase Change Materials for Thermal Energy Storage

Lak

Hsieh

Al-Mahbobi

et al. 2023

ACS Appl. Eng. Mater.

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Salt hydrate phase change materials are important in advancing thermal energy storage technologies for the development of renewable energies. At present, their widespread use is limited by undesired undercooling and phase separation, as well as their tendency to corrode container materials. Herein, we report a direct ink writing (DIW) additive manufacturing technique to print noncorrosive salt hydrate composites with thoroughly integrated nucleating agents and thermally conductive additives. First, salt hydrate particles are prepared from nonaqueous Pickering emulsions and then employed as rheological modifiers to formulate thixotropic inks with polymer dispersions in toluene serving as the matrix. These inks are successfully printed at room temperature and cured by solvent evaporation under ambient conditions. The resulting printed and cured composites, containing up to 70 wt % of the salt hydrate, exhibit reliable thermal cyclability for 10 cycles and suppressed undercooling compared to the bulk salt hydrate. Remarkably, the composites consistently maintain their structural integrity and thermal performance throughout the entirety of both the melting and solidification processes. We demonstrate the versatility of this approach by utilizing two salt hydrates, magnesium nitrate hexahydrate (MNH, T m = 89 °C) and zinc nitrate hexahydrate (ZNH, T m = 36 °C), to achieve desired thermal characteristics across a wide range of temperatures. Further, we establish that the incorporation of carbon black in these inks enhances the thermal conductivity by at least 33%. This approach consolidates the strengths of additive manufacturing and salt hydrate phase change materials to harness customizable thermal properties, well suited for targeted thermal energy management applications.

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Section: Resultsmentioning

confidence: 99%

Printing Composites with Salt Hydrate Phase Change Materials for Thermal Energy Storage

Lak

Hsieh

Al-Mahbobi

et al. 2023

ACS Appl. Eng. Mater.

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“…The capillary adsorption effect and intermolecular attraction forces can not only help confine and adsorb the melted salts to prevent leakage, but also suppress the loss of crystalline water, thus mitigating phase separation during repeated phase change processes. During the solidification process, these carbon fillers can provide numerous heterogeneous nucleation sites to reduce the supercooling of hydrated salts and to facilitate the liquid-to-solid phase transition and the release of latent heat [67][68][69][70][71]. Three-dimensional carbon, such as graphite foam, can retain the high thermal conductivity traits of carbon materials, and take advantage of its porous structure to inhibit phase separation, leakage, and supercooling issues [17,23].…”

Section: Carbon-enhancement Strategymentioning

confidence: 99%

Carbon-Enhanced Hydrated Salt Phase Change Materials for Thermal Management Applications

Liu,

Li,

et al. 2024

Nanomaterials

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Inorganic hydrated salt phase change materials (PCMs) hold promise for improving the energy conversion efficiency of thermal systems and facilitating the exploration of renewable thermal energy. Hydrated salts, however, often suffer from low thermal conductivity, supercooling, phase separation, leakage and poor solar absorptance. In recent years, compounding hydrated salts with functional carbon materials has emerged as a promising way to overcome these shortcomings and meet the application demands. This work reviews the recent progress in preparing carbon-enhanced hydrated salt phase change composites for thermal management applications. The intrinsic properties of hydrated salts and their shortcomings are firstly introduced. Then, the advantages of various carbon materials and general approaches for preparing carbon-enhanced hydrated salt PCM composites are briefly described. By introducing representative PCM composites loaded with carbon nanotubes, carbon fibers, graphene oxide, graphene, expanded graphite, biochar, activated carbon and multifunctional carbon, the ways that one-dimensional, two-dimensional, three-dimensional and hybrid carbon materials enhance the comprehensive thermophysical properties of hydrated salts and affect their phase change behavior is systematically discussed. Through analyzing the enhancement effects of different carbon fillers, the rationale for achieving the optimal performance of the PCM composites, including both thermal conductivity and phase change stability, is summarized. Regarding the applications of carbon-enhanced hydrate salt composites, their use for the thermal management of electronic devices, buildings and the human body is highlighted. Finally, research challenges for further improving the overall thermophysical properties of carbon-enhanced hydrated salt PCMs and pushing towards practical applications and potential research directions are discussed. It is expected that this timely review could provide valuable guidelines for the further development of carbon-enhanced hydrated salt composites and stimulate concerted research efforts from diverse communities to promote the widespread applications of high-performance PCM composites.

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“…Better TC enhancement can be achieved by improving the dispersion quality; [25,26,40,42] for example, it has been shown that the good dispersion quality of GnP fillers in a polymer matrix allows the formation of a filler network that further enhances the TC. [24,36] 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%

“…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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Design and preparation of salt hydrate/ graphene oxide@SiO2/ SiC composites for efficient solar thermal utilization

Cited by 26 publications

References 54 publications

Printing Composites with Salt Hydrate Phase Change Materials for Thermal Energy Storage

Printing Composites with Salt Hydrate Phase Change Materials for Thermal Energy Storage

Carbon-Enhanced Hydrated Salt Phase Change Materials for Thermal Management Applications

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

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