Research progress on the influence of nano-additives on phase change materials

Han, Lu; Zhang, Xuelai; Ji, Jun; Ma, Kunlin

doi:10.1016/j.est.2022.105807

Cited by 35 publications

(11 citation statements)

References 141 publications

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“…Thermal conductivity is an essential factor in evaluating PCM composites as it relates to heat transfer efficiency and response time in solid-liquid transition. [39][40][41] EG is an excellent choice for enhancing the thermal conductivity of PCM owing to its continuous heat bridge structure. [42] The thermal conductivity of each sample was measured at different temperatures and the results are shown in Fig 4c . The thermal conductivity of the samples showed an increasing trend with increasing mass fraction of EG, which is consistent with the theory.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Enhancement of Phase Change Materials through Three-Dimensional Macropore Lamellar Structured MOF/EG Composite for Solar Energy Storage and Beyond

Xiao

Shi

Geng

et al. 2023

Preprint

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Phase change materials (PCMs) have gained significant attention as thermal energy storage materials for reducing dependence on fossil fuels. However, the leakage caused by long-term molecular motion has become a bottleneck for the further advances of energy storage density and application value. Herein, a novel PCM composite with good shape stability, thermal conductivity and photothermal conversion capability was designed. Given the synergistic or hybridization effect between metal-organic frameworks (MOFs) and expanded graphite (EG) components offered the composite unique capabilities, even with the merits of both. The combination of ZIF-67 and EG in a hybrid structure can effectively prevent particle agglomeration, while simultaneously providing a high specific surface area and pore volume for the adsorption of paraffin wax. Compared to pristine unsupported PCMs, the as-obtained PCM composite possesses a 3-fold enhancement in thermal conductivity, 95.56% photothermal conversion efficiency and excellent shape stability. It demonstrates the potential of MOFs-enhanced PCM composites for thermal energy storage and highlight the importance of synergistic or hybridization strategies in the development of advanced materials for sustainable energy applications.

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Section: Resultsmentioning

confidence: 99%

Synergistic Enhancement of Phase Change Materials through Three-Dimensional Macropore Lamellar Structured MOF/EG Composite for Solar Energy Storage and Beyond

Xiao

Shi

Geng

et al. 2023

Preprint

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“…Accordingly, the supercooling of PEG is weakened. 36,37 In one of our previous studies, a nanoarray-modified metal foam was used as the supporting material of a PEG-based FSPCM. The nanoarrays act as the nucleating agent of PEG, reducing the supercooling of the material.…”

Section: Introductionmentioning

confidence: 99%

“…The most adopted method to reduce the supercooling degree now is to add additives into PEG as nucleating agents, which decrease the size of the crystals, reducing the melting point. Accordingly, the supercooling of PEG is weakened 36,37 . In one of our previous studies, a nanoarray‐modified metal foam was used as the supporting material of a PEG‐based FSPCM.…”

Section: Introductionmentioning

confidence: 99%

Form‐stable phase change materials supported by nanostructured zinc polyacrylate weakening super cooling of polyethylene glycol

Shen

Luo

et al. 2023

J of Applied Polymer Sci

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In order to solve the leakage and distinct super cooling issues of polyethylene glycol (PEG), zinc polyacrylate was used as the supporting material to prepare PEG‐based form‐stable phase change materials (FSPCMs) in this paper. The polyacrylate fractions of zinc polyacrylate are crosslinked by zinc ions through electrovalent bonding. Due to the strong intermolecular force between PEG molecules and the crosslinked polyacrylate fractions, the PCMs have stabilized shape even at 90°C. Zinc ions will gather together because of the incompatibility between PEG matrix and zinc ions, to form nanostructure as the nucleating agent of PEG, weakening the supercooling of the FSPCMs. The enthalpy change values of the FSPCMs in the phase transition processes are all above 120.0 J g−1, showing good thermal energy storage capacity. Additionally, the FSPCMs after 100 times of thermal cycling possess similar thermal properties to the original ones, indicating that the nanostructured zinc polyacrylate has stable interaction with the PEG matrix.

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“…Latent heat storage stores energy by absorbing or releasing heat when the phase change occurs in phase change materials (PCMs) [19]. This type of energy storage has attracted attention [20][21][22][23][24] because of its large heat storage capacity, small temperature fluctuation, approximate isothermal, and good chemical stability and safety [25][26][27][28][29]. There are mainly four types of phase transition processes: solid-liquid, solid-solid, solid-gas, and liquid-gas.…”

Section: Introductionmentioning

confidence: 99%

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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BackgroundIn this study, a series of phase change composites were developed. Phase change materials (PCMs) are substances with a high heat of fusion, thereby possessing great potential for solar thermal storage. However, their disadvantages, such as low thermal conductivity, phase separation, and supercooling, limit their further applications.ObjectiveIn this study, magnesium nitrate hexahydrate (MNH) was used as the phase change material, and different proportions of photothermal materials were added to improve the thermally conductive property and solar thermal storage efficiency of MNH.MethodsThis study used magnesium nitrate hexahydrate (MNH) as the substrate. In addition, different proportions of photothermal materials (carbon nanotubes, nano‐graphite, graphene, and partially reduced graphene oxide) were added to promote the efficiency of thermal energy storage. Additionally, a fixed ratio of carboxy methyl cellulose (CMC) was added. The phase change temperature and enthalpy change of the phase change material samples were explored and analyzed by differential scanning calorimeter (DSC). In addition, the thermophysical properties, photothermal storage performance, and thermal reliability analysis of the samples were investigated.ResultsThe results showed that the PCM composites prepared with nano‐graphite have higher latent heat and longer time of phase change. However, the composites prepared with carbon nanotubes (CNTs) have lower latent heat and a shorter time of phase change. Therefore, the partially reduced graphite oxide (PRGO)‐containing composites can retain the latent heat storage capacity of nano‐graphite and decrease the time of phase change, thereby improving the photothermal storage efficiency. The results reveal that the solar thermal storage efficiency of the composite with both CNTs and PRGO could reach up to 0.716.ConclusionsMCGOT‐1 and MCGOT‐2 have high latent heat values, and the phase transition time is short. Therefore, the thermal energy storage efficiency can be as high as 0.716. In addition, compared with related literature, the photothermal storage efficiency of MCGOT‐2 increased by about 2 times. Therefore, the environmentally friendly composites developed in this study have a high potential to be used in solar energy storage and energy‐saving systems.

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Research progress on the influence of nano-additives on phase change materials

Cited by 35 publications

References 141 publications

Synergistic Enhancement of Phase Change Materials through Three-Dimensional Macropore Lamellar Structured MOF/EG Composite for Solar Energy Storage and Beyond

Synergistic Enhancement of Phase Change Materials through Three-Dimensional Macropore Lamellar Structured MOF/EG Composite for Solar Energy Storage and Beyond

Form‐stable phase change materials supported by nanostructured zinc polyacrylate weakening super cooling of polyethylene glycol

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

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