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 22 publications

(4 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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“…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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“…In another research investigation Aqib et al [6] experimentally characterized the effect of dispersing metallic nanoparticle alumina and carbon nanoparticle MWCNT with organic PCM. Cui et al [7] designed salt hydrate PCM for solar thermal conversion system by adding graphene oxide and silicon dioxide. Likewise MXene/Ag nanoparticles were included with sodium sulfate decahydrate to enhance the optical absorbance and thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Optical performance and chemical stability evaluation of new era phase change material: Activated by hybrid nanoparticle

Pandey,

Kalidasan,

Rajamony

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Inorganic salt hydrate phase change materials (PCMs) are ahead of organic PCMs in terms of energy storage ability and safety as they are non-flammable. However the major hindrance with inorganic PCM are degree of supercooling and low thermal conductivity though better than organic PCM. The common technique to enhance the thermal conductivity is via dispersion of metal and carbon nanoparticle. Though they enhance the thermal conductivity of the nanocomposite, with continuous operation the nanoparticle agglomerate and settles down owing to their density. Henceforth, in the current research work we conduct an experimental investigation to enhance the optical and thermal performance of commercialised inorganic salt hydrate PCM using metal-carbon hybrid nanoparticle. We disperse graphene silver nanoparticle at different weight ratio adopting a two-step method followed by probe sonication to ensure uniform dispersion. We achieve a highly stable nanocomposite with 584% increase in optical absorbance of electromagnetic waves and 86% decrease in transmittance. Thermal management of electronic gadgets has evolved to be a major consideration of research as overuse of gadgets lead to rapid temperature rise and is in need of passive cooling system. Henceforth the newly developed nanocomposite phase change materials (PCMs) not only acts as thermal batteries but can also be opted as energy materials for thermal regulation and heat mitigation.

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

Cited by 22 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

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

Optical performance and chemical stability evaluation of new era phase change material: Activated by hybrid nanoparticle

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