APPLIED ENERGY
·
2014
·
IF 5.261
Xing Li,Ying Chen,Zhengdong Cheng,Lisi Jia,Songping Mo,Zhuowei Liu
Graphene is widely utilized because of its exceptional properties, such as strong mechanical strength, low weight, nearly optical transparency, and excellent conductivity of heat and electricity. In this study, we used the ultrahigh specific surface area of graphene due to its inherently two-dimensional nature to reduce the subcooling of freezing of a phase change material. The results enable graphene’s application in energy storage using the latent heat of phase transition. The need for subcooling to freeze water was eliminated completely with the suspension of a very low mass fraction (0.020 ± 0.001 wt%) or surface area concentration (0.070 ± 0.003 m 2 /ml) of graphene. Compared to nanoparticles of SiO 2 and TiO 2 with the same mass fraction suspended in water, flakes of graphene led to freeze water at a much smaller subcooling degree, and shorter total freezing time. The addition of surfactants can improve suspension stability and further reduce the degree of subcooling, but it also slightly increases the total freezing time. Graphene flakes are more suitable than spherical oxide nanoparticles for use as nucleating additives in water.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·593-601
·
IF 12.732
Maohua Li,Linhong Li,Yue Qin,Xianzhe Wei,Xiangdong Kong,Zhenbang Zhang,Shaoyang Xiong,Hainam Do,James C. Greer,Zhongbin Pan,Tao Cai,Wen Dai,Cheng-Te Lin,Nan Jiang,Jinhong Yu
Considering the significant threat of heat to electronic equipment and heat dissipation problems existing in powerful systems, thermal management materials are in high demand. In conjunction with the increasing need to dissipate heat and stabilize temperature, high thermal conductivity and phase change latent heat are attracting more attention when designing thermal management materials. This work proposes a strategy to combine a phase change matrix and thermally conductive filler using freeze casting. The highest thermal conductivity reaches 23.1 W m−1 K−1 accompanied by 62 J g−1 phase change latent heat. Meanwhile, replacing ice with an organic phase change material in freeze casting can result in an aligned structure. This discovery will pave a novel way for introducing thermal latent heat without abandoning the aligned structure.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Tianping Feng,Xuelai Zhang,Jun Ji
In the context of the dual‑carbon target, there is a high emphasis on the energy efficiency of traditional mechanical cold storage systems with significant power consumption . Additionally, the implementation of time-of-use electricity pricing has played a crucial role in driving the rapid advancement of energy storage technology . The application of energy storage technology in cold storage can significantly reduce the energy consumption of the refrigeration system , save operating costs by shifting peak demand to valleys, and reduce start and stop frequencies. Therefore, studying phase-change materials with high latent heat, low cost, and good performance for cold storage is of great practical application in cold storage. The paper developed four types of gel-type phase-change cold storage materials with high latent heat, low cost, and good cycle stability. These materials mainly consist of NH4Cl, KCl, and deionized water . The phase transition temperature ranges from −18 to −21 °C, the latent heat of phase change is approximately 260 to 289 J/g, and the thermal conductivity ranges from 0.58 to 0.60 W/(m·K), which can meet the cooling demand of cold storage facilities. Furthermore, by comparing the phase transition temperature, latent heat value of phase change, and cyclic stability, a gel-type PCM with good comprehensive properties was selected for corrosion and corrosion inhibition studies with five common metal samples in welded and non-welded forms. The results showed that material B2 had slight corrosion on 1060 aluminum , 6061 aluminum, and 304 stainless steels , but no obvious corrosion phenomenon was found on 316 stainless steels . The corrosion rate of the material on red copper was the highest, and the corrosion was too strong. In addition, the corrosion of welded parts is more serious than that of non-welded parts, and the welding points are more susceptible to corrosion. Adding the corrosion inhibitor BTA to material B2 can reduce the corrosion rate of red copper by more than 94 %.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Cities and Society
·
2018
·
IF 3.073
Li Yang,Xiaoling Cao,Nan Zhang,Bo Xiang,Zhaoli Zhang,Bin Qian
The thermal reliability of phase change materials (PCMs) is an important factor for the successful application of latent heat thermal energy storage. In this work, 10,000 thermal cycles have been firstly carried out to investigate the thermal reliability of four typical fatty acids (lauric acid, myristic acid, palmitic acid and stearic acid) as PCMs. The thermal properties before and after cycles were tested by differential scanning calorimeter. It was found that with increasing number of thermal cycles, both the phase transition temperature and the latent heat tended to decrease. In the experiment, the maximum change in the melting temperature was −0.37 °C and change rate of latent heat was −7.57%. The freezing temperature decreased obviously with increasing number of thermal cycles, which led to a maximum increase of 4.15 °C in the degree of supercooling. In addition, the specific heat and thermal conductivity of the PCMs after 10,000 thermal cycles had no significant change. FT-IR showed that the chemical structure of fatty acids had not changed after thermal cycles. The experimental results showed that these fatty acids can function as admirable PCMs with high thermal reliability for long-term applications.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 32
·2405077
·
IF 14.3
Chenxiao Yin,Jingrui Sun,Chang Cui,Ke-Ke Yang,Ling-Ying Shi,Yiwen Li
Energy and environmental issues have increasingly garnered significant attention for sustainable development. Flexible and shape-stable phase change materials display great potential in regulation of environmental temperature for energy saving and human comfort. Here, inspired by the water absorption behavior of salt-tolerant animals and plants in salinity environment and the Hofmeister theory, highly stable phase change salogels (PCSGs) are fabricated through in situ polymerization of hydrophilic monomers in molten salt hydrates, which can serve multiple functions including thermal management patches, smart windows, and ice blocking coatings. The gelation principles of the polymer in high ion concentration solution are explored through the density functional theory simulation and verified the feasibility of four types of salt hydrates. The high concentration chaotropic ions strongly interacted with polymer chains and promoted the gelation at low polymer concentrations which derive highly-stable and ultra-moisturizing PCSGs with high latent heat (> 200 J g −1 ). The synergistic adhesion and transparency switching abilities accompanied with phase transition enable their smart thermal management. The study resolves the melting leakage and thermal cycling stability of salt hydrates, and open an avenue to fabricate flexible PCM of low cost, high latent heat, and long-term durability for energy-saving, ice-blocking, and thermal management.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2020
·
IF 6.082
Jie Ding,Xiaodong Wu,Xiaodong Shen,Sheng Cui,Xiangbao Chen
In this work, palmitic acid (PA) is used as the PCM , while a novel kind of 3D porous carbon/silica composite aerogel (CSA) is involved as porous supporting material to prepare the form-stable PCM composites (PA/CSA). The carbon aerogel supported PCM composite (CA/PA) is provided as control. PCM infiltration mainly occurs for the large pores rather than micropores or mesopores. PA molecules are physically well combined with CA and CSA due to capillary force and surface tension. The addition of amorphous CA and CSA limits the crystalline growth of PA molecules. The CA/PA shows a separated and layered structure while the CSA/PA presents a CSA@PA core-shell structure with a rough surface due to large pores within the CSA pore matrix. The PCM loading mass fraction of CSA/PA (82.2%) is much larger than that of CA/PA (64.1%), and liquid leakage test indicates its excellent form-stabilization property. The melting point and melting latent heat of CA/PA sample is 39.73 °C and 96.27 J/g, respectively, while the melting latent heat of the CSA/PA sample is as high as 187.7 J/g. The CSA/PA possesses excellent thermal stability during cycling test and its short-term thermal insulation property has also been verified in this study.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Peng Gong,Pan Guo,Fei Liu
Organic phase change materials (PCMs), particularly paraffin (PA), are renowned for their substantial latent heat storage capacities. Despite this advantage, their practical application is often hampered by inherent drawbacks such as inadequate leakage resistance , low thermal conductivity , and inefficient photothermal conversion. This study introduces a novel fabrication technique for phase change composites (PCCs) that involves electroplating a nanostructured Cu film onto fiber-structured carbon felts, thereby creating a thermally conductive scaffold for the PCMs . The thermal conductivity of the resulting CuF@PA composite was significantly improved to 1.3 Wm^-1 K^-1, which is 6.5 times higher than that of pure PA. Furthermore, the incorporation of a Cu nanostructure within the composite significantly bolsters its leakage resistance and photothermal conversion efficiency. The CuF@PA composite also boasts a high phase transition enthalpy of 167.1 Jg^-1, showcasing its superior energy storage capability. These findings suggest that the synergistic combination of carbon felt and nano Cu film offers a promising solution to overcome the limitations of traditional PCMs. The developed PCC demonstrates significant promise for diverse applications including solar thermal energy storage and advanced thermal management.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Meng Jia,Aimin Sha,Wei Jiang,Wentong Wang,Jiange Li,Jiasheng Dai,Zhen Lu
Poly(ethylene glycol) (PEG) is a latent heat storage material that has potential to regulate the thermal environment within the asphalt pavement via phase-transition process. However, the properties of PEG vary in terms of its average molecular weight. The PEG selection principle is put forward in this study, which is to not only realize satisfactory cooling function but also minimize the adverse effects on asphalt properties. For illustration, the phase change behaviors and thermal stability of PEG were first studied. It is demonstrated that the PEG samples with its average molecular weight within 2000 ~ 20000 (PEG-2 K ~ 20 K) are characterized by suitable phase change temperatures of 41.27 ~ 62.39 °C, fairly great latent heats of 184.8 ~ 211.9 J·g −1 and excellent thermal stability below 300 °C. The larger molecular weight generally corresponds to the higher phase change temperatures, whereas the greatest latent heats occur at PEG-8 K. Despite that, there are marginal differences among the phase change properties of PEG-4 K ~ 8 K. To further select the ideal PEG, tests for asphalt properties were conducted. Results show that based on the negative role of PEG in the high- and low-temperature properties, temperature and stress sensitivities of asphalt binder, it is necessary to encapsulate PEG before use. Therefore, these detrimental roles are required to be considered when selection of PEG. In terms of our selection principle proposed, PEG with a large average molecular weight is usually preferred except PEG-20 K.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Thermal Science
·
2021
·Vol. 30
·期 6
·2002-2014
·
IF 2.438
Shao Xuefeng,Yang Sheng,Chen Chenlin,Fan Liwu,Yu Zitao
The temperature-dependent rheological behaviors of five selected binary eutectic mixture sugar alcohols, with great potential for latent heat storage in the range of 353.15 K to 523.15 K, were investigated. It was found that the rheological behaviors of the mixture sugar alcohols depend on those of the pure compounds as well as their molar ratios. The two mixtures of xylitol (75 mol%)+erythritol and erythritol (84 mol%)+d-mannitol behave like pseudoplastic fluids with typical non-Newtonian shear-thinning behaviors, as indicated by the power law index of 0.99 (<1). The mixture of d-mannitol (70 mol%)+d-dulcitol is a nonlinear Bingham fluid, exhibiting a slight yield stress (0.001 Pa to 0.01 Pa) at low shear rates. The rest two mixtures containing the cyclic-structured inositol behave like Herschel-Bulkley fluids. The infinite shear viscosities of the eutectic mixtures over the entire temperature range appear to be higher than those of their respective pure compounds, except for inositol. The mixture of xylitol (75 mol%)+erythritol at its melting point shows higher dynamic viscosity of about 0.546 Pa·s than the values of about 0.396 Pa·s and 0.035 Pa·s for xylitol and erythritol, respectively. In addition, the activation energies of viscous flow of the mixtures, as determined by fitting the dynamic viscosity-temperature curves using the Arrhenius model, also exhibit higher values than those of their pure compounds. The activation energy of viscous flow of the mixture xylitol (75 mol%)+erythritol was determined to be about 92 400 J/mol in the supercooled liquid state, while the supercooled liquid xylitol and erythritol have much lower values of 83 500 J/mol and 51 900 J/mol, respectively. Both the increased dynamic viscosities and activation energies of viscous flow can result in deteriorated crystallization performance during latent heat retrieval.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 4
·2896-2905
·
IF 11.806
Xu Haitao,Zu Mei,Cheng Haifeng,Liu Dongqing,Xie Wei
The thermal management of electronic devices has attracted significant research attention in the recent year. However, the commonly used thermal management materials at this stage are mainly phase change materials (PCMs), which are limited by their relatively low enthalpy. In this study, the metal–organic framework MIL-101(Cr) was synthesised by an environmentally friendly and low-cost L-malic acid as the mineralising agent. The as-prepared MIL-101(Cr) composite coating was utilised as a sorbent for a passive thermal management strategy, through a vapour sorption–desorption process. By coating the as-prepared MIL-101(Cr) powder onto a metal substrate, a temperature drop for 25 min (maximum 8.6 °C) was achieved for 0.256 g of coating at a heating power of 2.5 W. The use of latent heat has emerged as an attractive method for intermittent heat dissipation. The equivalent enthalpy of the composite coating could reach as high as 1171.9 J/g coating , indicating a significant improvement in the thermal management performance compared with the conventional PCMs. Graphical abstract
Summary: A composite coating for thermal management was obtained by silicate solution and powder MIL-101(Cr).
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jie Yu,Yuwei Wang,Cong Qi,Wenjie Zhang
Nanoparticles and metal foam are doped with the phase change materials (PCMs) to improve the utilization efficiency of solar energy during the day. In order to investigate the latent heat power generation properties of this hybrid PCM at night, A photothermal conversion experimental platform was built in this paper, the effects of metal foam pore density (PPI=0, 5, 10, 15) and nanoparticle concentrations ( ω = 0%, 0.5%, 0.8%, 1.0%) on the reverse temperature difference properties were investigated. Results indicates that PPI= 15 metal foam and ω = 1.0% nanoparticles can reduce the internal temperature of hybrid PCM by 35.92% and 20.93% respectively compared with pure paraffin. PPI= 15, 10, and 5 metal foam decreases the temperature difference, voltage, and power generation at most by 74.57%, 71.02%, and 74.54% compared with PPI= 0. Compared with ω = 0% nanoparticles, the temperature drop rates of ω = 1.0%, 0.8%, and 0.5% nanoparticles increase at most by 103.0%, 79.69% and 39.84% respectively. To a certain extent nanoparticles and metal foam are not conducive to reverse latent heat power generation although they are beneficial to photothermal performance. This research has reference and guiding significance for reverse latent heat power generation properties of PCMs doped with nanoparticles and metal foam at night.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xue-Feng Shao,Sheng Yang,Hong-Yi Shi,Li-Wu Fan,Yan-Ping Yuan
Sugar alcohols have been proposed as a class of potential phase change materials (PCMs) for medium-temperature latent heat storage . The present work investigated the cycling stability of four pure and three mixture sugar alcohols by a specially-designed test setup, followed by a comprehensive evaluation based on their phase change behaviors (reported in our previous publication) and stability. It was found that the latent heats of fusion/crystallization degrade upon consecutive melting-crystallization cycles, and a higher degree of superheat Δ T sh leads to a faster degradation. An extremely low level of only 10.5 % degradation was obtained for erythritol after 200 cycles at a relatively low Δ T sh of 20 °C. The corresponding degrees of supercooling Δ T sc become higher due to the remarkable reduction of crystallization temperatures . It was shown that introducing protective nitrogen gas could suppress oxidation and improve cycling stability. The cycles of half degradation on latent heat of fusion was ~3.6 times with nitrogen protection. A comprehensive evaluation identified that the crystallization-related issues and poor stability are the primary challenges for sugar alcohols. Nevertheless, other than common PCMs, some particular application scenarios like controllable latent heat retrieval and seasonal heat storage can be hopefully developed by virtue of the deep supercooling nature of sugar alcohols.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）