Mica-stabilized polyethylene glycol composite phase change materials for thermal energy storage

Abstract

Mica was used as a supporting matrix for composite phase change materials (PCMs) in this work because of its distinctive morphology and structure. Composite PCMs were prepared using the vacuum impregnation method, in which mica served as the supporting material and polyethylene glycol (PEG) served as the PCM. Fourier transform infrared and X-ray diffraction analysis confirmed that the addition of PEG had no effect on the crystal structure of mica. Moreover, no chemical reaction occurred between PEG and mica during the vacuum impregnation process, and no new substance was formed. The maximum load of mica-stabilized PEG was 46.24%, the phase change temperature of M 400 /PEG was 46.03°C, and the latent heat values of melting and cooling were 77.75 and 77.73 J•g −1 , respectively. The thermal conductivity of M 400 /PEG was 2.4 times that of pure PEG. The thermal infrared images indicated that the thermal response of M 400 /PEG improved relative to that of pure PEG. The leakage test confirmed that mica could stabilize PEG and that M 400 /PEG had great form-stabilized property. These results demonstrate that M 400 /PEG has potential in the field of building energy conservation.

Waste Plastic Polypropylene Activated Jujube Charcoal for Preparing High-Performance Phase Change Energy Storage Materials

“…Porous carbon made under the condition of inert gas protection cannot avoid combining with oxygen in the air to form oxygen-containing groups such as C=O, –OH, and –C–O, which will affect the surface structure of the composite. Overall, the infrared absorption peak of the composite phase change material contained the characteristic absorption peak of PEG, and no new structural characteristic peak appeared, indicating that there was no chemical reaction between PEG and jujube charcoal during the composite process, and the carbon material and PEG were composed of only physical effects [ 24 ]. The wavenumber change corresponding to some groups of PEG and the composite materials indicates that there may be some force between PEG and jujube charcoal.…”

Synthesis and Properties of Dynamic Crosslinking Polyurethane/PEG Shape-Stable Phase Change Materials Based on the Diels–Alder Reaction

“…In order to ensure safer and more efficient thermal management, researchers have paid more attention to development of thermal management technology and materials based on advanced PCMs, in particular organic-based solid–liquid phase change materials (SLPCMs), such as alkanes, fatty acids, and polyols. These materials have a supercooling degree, low price, and stable physical and chemical properties and have a dominant role in thermal management fields. , However, the inherent defect of SLPCMs limits their application: easy leakage during repeated solid–liquid phase transition procedures. , In order to solve this problem, researchers developed three effective technologies, namely, encapsulation, , chemical crosslinking, , and porous support material adsorption using inorganic and organic materials − to fabricate shape-stable phase change materials (SSPCMs). In general, using some inorganic materials as the encapsulating and supporting materials generally needs more complex preparation methods or high cost.…”

Carbon Nanofibers Coated with MOF-Derived Carbon Nanostructures for Vanadium Redox Flow Batteries with Enhanced Electrochemical Activity and Power Density

“…Depletion of fossil fuels, environmental pollution, and energy crisis has engendered the higher utilization of renewable and sustainable energy such as solar or wind energy, etc. − To meet the growing demand, large-scale energy devices, which must be safe and cost-effective, are required to store the energy harvested from different energy sources, to use it for various applications and to connect with the grid. − Among available storage technologies, the application of redox flow batteries (RFBs) has been rising with great assurance. − In RFBs, energy storage and power generation are decoupled. The choice of flexibility in design, high safety, and long-life cycle make vanadium redox flow batteries (VRFB) a promising device. − They utilize vanadium ions, which exist in four different oxidation states.…”