Graphene Aerogels Enhanced Phase Change Materials prepared by one-pot method with high thermal conductivity and large latent energy storage

Liu, Lin; Zheng, Ke; Yang, Yan; Cai, Zihe; Lin, Sihan; Hu, Xiaobin

doi:10.1016/j.solmat.2018.06.005

Cited by 111 publications

(33 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,19,28 Different surfactant ratios were tested, 0.7:1, 1:1, and 1.3:1 of SDBS on the NEPCMs including 2.0 wt% of NPs. In the case of unstable suspension particles, the particles become agglomerated and settled to the bottom of the glass tube.…”

Section: Stability Dispersion and Morphology Resultsmentioning

confidence: 99%

“…In order to have a stably dispersed NPs in MA following the preparation, SDBS was added as a surfactant. 7,19,28 Different surfactant ratios were tested, 0.7:1, 1:1, and 1.3:1 of SDBS on the NEPCMs including 2.0 wt% of NPs. The following photograph ( Figure 1) shows how homogeneous the mixture is in case of TiO 2 .…”

Section: Stability Dispersion and Morphology Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

et al. 2019

View full text Add to dashboard Cite

Summary Fatty acids have been broadly used as phase change materials (PCMs) for thermal energy storage. However, low thermal conductivity limits their performances. This paper investigates the influence of metal oxide nanoparticle addition on myristic acid (MA) as nano‐enhanced PCM (NEPCM). Stability, chemical, and thermal properties were considered. Four types of nanoaprticles, TiO2, CuO, Al2O3, and ZnO, were dispersed in MA at 0.1, 0.5, 1, and 2 wt%. Stability and dispersion were checked by sediment photograph capturing and scanning electron microscopy/energy‐dispersive spectroscopy. The Fourier‐transformed infrared (FTIR) and X‐ray diffraction analysis confirmed no chemical interaction between the nanoparticles and MA. The results revealed a ratio of thermal conductivity of 1.50, 1.49, 1.45, and 1.37, respectively, for 2 wt% of ZnO, Al2O3, CuO, and TiO2. The T‐history method confirmed this enhancement. The latent heat thermal energy storage (LHTES) properties of the nano‐enhanced MA were evaluated using differential scanning calorimetry. The latent heat capacities of nano‐enhanced MA samples have dropped between 9.64 and 5.01 % compared with pure MA, and phase change temperature range was not affected significantly. The NEPCM was subjected to 500 thermal cycling, it showed a good thermal reliability as LHTES properties remained unchanged, while FTIR analysis showed similar characteristics compared with uncycled samples, indicating a good chemical stability. Based on the results regarding with the LHTES properties, cycling thermal reliability, and higher thermal conductivity improvement, it can be achieved that the MA/Al2O3 (2.0 wt%) and MA/ZnO (2.0 wt%) composites could be better PCMs for solar TES applications.

show abstract

Section: Stability Dispersion and Morphology Resultsmentioning

confidence: 99%

Section: Stability Dispersion and Morphology Resultsmentioning

confidence: 99%

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

et al. 2019

View full text Add to dashboard Cite

show abstract

“…There are many types of PCMs, including organic PCMs such as paraffin [ 1 , 2 , 3 ] and inorganic PCMs such as inorganic salt hydrates [ 4 , 5 ]. However, all of them have the problem of low thermal conductivity, which leads to low efficiency of phase change and the phenomenon of overcooling and overheating [ 6 , 7 , 8 , 9 , 10 ]. In addition, they are prone to leakage in the absence of containers and other encapsulation conditions [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Silver Attached Graphene-Based Aerogel Composite Phase Change Material and the Enhancement of Thermal Conductivity

et al. 2020

View full text Add to dashboard Cite

Phased energy storage technologies are highly advantageous and feasible for storing and utilizing clean renewable energy resources, for instance, solar energy and waste heat, and it is an effective method to improve energy efficiency and save energy. However, phase change energy storage has some problems, for example, low thermal conductivity and phase change leakage, which lead to limited application. In this paper, anisotropic graphene aerogels were prepared by ice crystal template method with high thermal conductivity of graphene, and silver was attached to the pore wall graphene sheets and the graphene sheet boundaries of the aerogels. The results show that anisotropic graphene aerogels were successfully prepared, and SEM and EDS indicate that up to 9.14 at % silver was successfully attached to the graphene sheets and boundaries. The anisotropic thermal conductivity of the PArGO phase change composites after adsorption of the paraffin is significant, with a maximum axial thermal conductivity of PArGO of 1.20 W/(mK) and radial thermal conductivity of 0.54 W/(mK), compared to the pure paraffin (0.26 W/(mK)) increased by 362% and 108%, respectively. The enthalpy of the composite has been reduced to 149.6 J/g due to the silver particles attached, but the thermal properties have been greatly improved. In experiments simulating real temperature changes, PArGO achieves phase transitions very fast, with a 74% improvement on thermal efficiency of storage and discharge over the pure paraffin.

show abstract

“…Besides the common nanoparticles, graphene has drawn researchers' attention recently and has been studied extensively [30][31][32][33][34][35][36]. Liu et al [34] prepared and characterized two types of reduced graphene oxide (GO) combined with alkane, alcohol and carboxylic acid phase change materials (PCMs), and the thermal conductivity of the rGO/stearic acid composite could be increased to 3.21 (W/m•K). Kant et al [35] pointed out that emulsifying graphene nanoparticles in PCM resulted in a relative increase of the dynamic viscosity, and significantly degraded its natural convection heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

et al. 2019

View full text Add to dashboard Cite

HITEC salt (NaNO2-NaO3-KNO3) and solar salt (NaO3-KNO3) are typical molten salts used in concentrated solar power. Adding nanoparticles is an effective method to improve the thermo-physical properties of pure salt. It is indispensable to experimentally study the rheological behaviours of salt seeded with nanoparticles, which can increase the specific heat capacity of pure salt. In this work, the viscosities of HITEC salt were measured with different shear rates in the temperature range of 200 °C to 450 °C firstly, while those of solar salt were measured in the temperature range of 250 °C to 500 °C. The experimental data showed reasonable agreement with the literature correlations, which verify the Newtonian behaviours of pure salts. The evolutions of the viscosities of nanocomposites in the same temperature range were measured and analysed, where the nanocomposites were synthesized with 1 wt.% or 2 wt.% Al2O3 nanopowder and graphene, respectively. Results showed that the addition of Al2O3 nanopowder had relatively little effect on viscosity, and the variations were about −35.4%~8.1% for the HITEC salt nanocomposites and −9.2%~68.1% for the solar salt nanocomposites. While graphene would apparently increase the viscosities of HITEC salt and solar salt, HITEC salt with the addition of graphene showed slight non-Newtonian fluid behaviour.

show abstract

Graphene Aerogels Enhanced Phase Change Materials prepared by one-pot method with high thermal conductivity and large latent energy storage

Cited by 111 publications

References 47 publications

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

Silver Attached Graphene-Based Aerogel Composite Phase Change Material and the Enhancement of Thermal Conductivity

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

Contact Info

Product

Resources

About