Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 23
·14319-14327
·
IF 10.733
Xiaoqiao Fan,Lu Liu,Xin Jin,Wentao Wang,Shufen Zhang,Bingtao Tang
The latent heat storage of PCMs has gained increasing attention in the solar energy application field due to their high thermal energy storage density. However, the lack of energy conversion ability of the organic PCMs results in the low utilization efficiency of solar energy. Herein, we report a novel PEG/Ti3C2Tx layered composite PCM with superior photothermal storage capability, which consists of stacked Ti3C2Tx nanosheets and PEG filled within the spaces between the flakes. The resulting composites exhibited a strong absorption capacity for electromagnetic waves at the UV-Vis-NIR region. Notably, there are two enhanced absorption bands at the visible and near-infrared regions due to the localized surface plasmon resonance (LSPR) effect of the Ti3C2Tx nanosheets, which endows the composite PCM with excellent photo-to-thermal storage efficiencies (up to 94.5%) under actual solar light irradiation. In addition, the composite PCM also possesses a high energy storage density and form-stable property before and after the phase transition. These results indicate that the synthesized composite presents superior comprehensive properties suitable for solar energy storage applications.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Kaichen Wang,Tianying Zhang,Tieying Wang,Chao Xu,Feng Ye,Zhirong Liao
Metallic phase change materials (PCMs) have the advantages of large phase change latent heat, high heat storage density and broad application prospects in various high temperature industrial waste heat recovery and utilization. However, due to the strong corrosion of molten metal at high temperature, appropriate packaging technology is the prerequisite for the promotion and application of metallic PCMs. In this research, a high temperature PCM microencapsulating technology with SiCN shell and a new microencapsulation method was proposed. The high temperature microencapsulated phase change materials (MEPCMs) with the core–shell mass ratios of 5:1, 4:1 and 3:1 were prepared by “solvent evaporation-heating curing” method, using SiCN cured by organic polysilazane (OPSZ) as heat resistant shell material and Al-Si particles as core PCMs. The mechanisms of shell formation and coating of OPSZ were studied experimentally, as well as the material properties and thermal performance of MEPCMs. With the increase of temperature, OPSZ gradually formed a dense SiCN shell on the surface of Al-Si particles. The experimental results showed that MEPCMs with the core–shell mass ratio of 4:1 had a high phase change temperature (571.9 °C-573.7 °C) and good heat storage capability (281.2 J/g-282.9 J/g). SiCN shell was conducive to maintain a complete core–shell structure, and exhibited excellent thermal resistance and oxidation resistance to protect inner core materials during thermal cycles. Therefore, the prepared microcapsule was a potential heat storage material, which provided a new idea for developing microencapsulation method of high temperature PCMs.
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
ACS Applied Energy Materials
·
2022
·
IF 6.959
Junlin Chen,Zijie Mo,Yuanzhou Chen,Pingjing Mo,Ziyue Hu,Xiang Chen,Jian Yu,Zhifeng Hao,Xiaoliang Zeng,Rong Sun,Jianbin Xu
To improve the solar energy storage efficiency and thermal conductivity, we developed stable 3D-Ti3C2Tx framework-supported composites as phase change materials (FCPCMs) fabricated by the spatial confining forced network assembly (SCFNA) method. The 3D-Ti3C2Tx framework was constructed by decomposition of a compressed mixture of NH4HCO3 and Ti3C2Tx nanosheets. The controllable porous structure of the 3D-Ti3C2Tx framework and hydrogen bonds between -OH groups (or -F groups) on the surface of MXene and the long chain of PEG benefited the good impregnation of PEG into the framework with good compatibility. Therefore, the developed PCM composites exhibited satisfactory phase change enthalpy in the range of 93.36–119.11 J/g. Compared with PEG8000, the thermal conductivity of the composite with loading 40 wt % of 3D-Ti3C2Tx increased from 0.166 to 1.733 W/(m·K). The improvement of the thermal conductivity is mainly derived from the thermal conduction path provided by the stable 3D-Ti3C2Tx framework. Based on the spatial confining forced network assembly, FCPCMs presented good shape stabilization and thermal reliability in 200 melting–freezing cycles. Benefiting from the construction of the 3D-Ti3C2Tx thermal conductivity path, the fast temperature increase rate under light irradiation is the highlight of FCPCMs. It is noted that FCPCMs exhibit both good photothermal conversion and energy storage efficiency, with the photothermal conversion and storage performance η as high as 95%. Consequently, the developed PCM composites in this work exhibited tremendous application potential in the solar energy utilization field.
研究领域:
材料科学
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能源工程
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 18
·4611
·
IF 3.1
Chuang Zhu,Minhao Xu,Baiyuan Tian,Manting Gu,Li Gong
The aim of this study is to further enhance the thermal storage and heat transfer performances of a low-melting-point quinary salt. The eutectic salt was prepared using LiNO3, NaNO3, KNO3, NaNO2, and KNO2as raw materials, followed by the doping of nano-SiO2and nano-MgO into the base salt using a microwave-assisted method. The thermal properties of the samples were analyzed using a Synchronous Thermal Analyzer and a Laser Flash Apparatus. The co-doping of two types of nanoparticles was found to significantly enhance the specific heat capacity of the base salt. The maximum specific heat reached 2.36 J/(g·K), showing a 50.4% increase compared to the base salt. The thermal conductivity of molten salts can be affected by nanoparticles. An observed sample demonstrated a thermal diffusivity of 0.286 mm2/s, indicating a 19.2% improvement over the base salt, which may be attributed to enhanced phonon thermal efficiency. In addition, this study revealed that while interfacial thermal resistance can enhance specific heat capacity, it can also lead to a decrease in the thermal conductivity efficiency of materials. This work can offer insights and references for the enhancement of molten salt properties.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
PubMed
高影响因子
ENERGY AND BUILDINGS
·
2022
·
IF 7.201
Xin Li,Yajing Zhao,Xin Min,Jun Xiao,Xiaowen Wu,Ruiyu Mi,Yan'gai Liu,Zhaohui Huang,Minghao Fang
Phase change materials (PCMs) have attracted more and more attention in the field of latent heat storage. In order to solve the leakage behavior and improve heat transfer performance of polyethylene glycol (PEG), a method of self-assembled hybrid aerogel filled with carbon nanotubes (CNTs) combined with reduced graphene oxide (rGO) nanosheets is proposed herein. The as-prepared CNTs-graphene hybrid aerogel (CGA) with three-dimensional porous structure can be used as a highly adsorptive and stable carrier for PCM . After the vacuum impregnation process, a high-performance PEG/CGA composite PCMs (c-PCMs) is obtained, which exhibits an outstanding PEG loading ratio of 97.6 %. Moreover, after 1000 repeated heating/cooling cycles, the H M and H S value of PEG/CGA c-PCMs remained 93.44 % and 92.84 %. Meanwhile the PEG/CGA c-PCMs remains intact and the loading ratio could still maintain as high as 96.4 %, which proved that PEG/CGA c-PCMs presented reliable thermal cycling stability. The PEG/CGA c-PCMs only takes 603 s to raise from 30 ℃ to 70 ℃, which is much faster than that of pure PEG (813 s) and PEG/GA composite (727 s). And The thermal conductivity of PEG/CGA(0.586 W/(m∙K)) was 186 % times than that of pure PEG(0.314 W/(m∙K)).The introduction of CNTs can not only enhance the adsorption capacity of c-PCMs and alleviate the leakage of PEG, but also improve the heat transfer performance of c-PCMs. These results specify that PEG/CGA c-PCMs can be used as remarkable and stable energy storage materials for environmental thermal management systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
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
FUEL
·
2022
·
IF 8.035
Qi Zhang,Zhen Zhang,Wanli Xia,Yaming Zhou,Hongmin Yang
Lauric acid (LA) shows much potential as one organic phase change material (PCM) for thermal energy storage, owing to its suitable melting point, relatively high thermal/chemical stability and latent heat. However, the LA-based thermal storage method invariably suffers from the big challenges of liquid leakage tendency and low thermal conductivity of single lauric acid, limiting immensely its practicality. Herein, one encapsulation and modifying strategy to fabricate high conductive and low liquid leakage composite phase change materials (CPCMs) for photo-thermal storage was proposed by constructing novel graphene doped LA/g-C 3 N 4 CPCM. Firstly, LA is infiltrated into a novel two-dimensional porous matrix – the graphitic phase carbon nitride (g-C 3 N 4 ) to prevent liquid leakage in the solid–liquid phase change process. Then it is further incorporated with a certain amount of graphite nanoplatelets to further enhance thermal conductivity. The encapsulation and modifying strategy enable the graphene doped LA/g-C 3 N 4 to show excellent thermal storage performance for both heat and light energy, low liquid leakage, and high thermal stability. The hybrid LA/g-C 3 N 4 with 5 wt% graphene (CPCM3) modification has a melting temperature of 45.88 °C and enthalpy of 159.19 J/g. The corresponding solidification temperature and enthalpy are 43.36 °C and 144.40 J/g, respectively. Its thermal conductivity at 50 °C is enhanced to 0.9338 W/(m·K) (one time higher than single LA), also superior to the state-of-the-art LA-based CPCMs. After 100 thermal cycles, the composite phase change material only suffers low mass loss and latent heat loss of phase change, which proves the good thermal reliability. Furthermore, TGA and DTG data indicate that CPCM3 can maintain good thermal stability in the normal operating temperature range. In the whole, the joint effect of the porous g-C 3 N 4 matrix and graphene modification improve the thermal storage performance of LA through the improvement of liquid immobilization and thermal conductivity. This work provides a promising strategy for fabricating high conductive and low liquid-leakage CPCM toward enhanced photo-thermal storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Ping Hu,Yang Feng,Qi Li,Chuan-Huang Lin,Yu-Hao Ning,Yi-Ting Li,Lin-Ping Yu,Zhong Cao,Ju-Lan Zeng
Microencapsulation of phase change materials (PCMs) with functional shell materials such as luminescent material could endow the obtained microencapsulated PCMs (MPCMs) with improved latent heat storage properties. The PCM core in turn could protect the luminescence shell from large temperature shifting and thus improve its performance. In this work, a series of MPCMs derived from n -octadecane (ODE) core and CaF 2 shell were synthesized via a self-assembly method. The effects of the preparation conditions, including the core/shell mass ratio, the dosage of the emulsifier (styrene-maleic anhydride copolymer , SMA) and the dosage of the chelator (Na 3 Cit), on the properties of the prepared ODE@CaF 2 MPCMs were investigated and the optimal preparation condition was obtained. The MPCM obtained according to the optimal procedure (MPCM1) exhibited an encapsulation ratio of 54.02% and a latent heat of 131 J/g with negligible leakage. It also possessed excellent thermal reliability and significantly improved thermal conductivity . The MPCM1 could not only be utilized as good latent heat storage material and thermal regulation material, but also provided one new idea to prevent the thermal quenching of luminescence materials. In addition, this work could shed some light on the high-value utilization of recovered fluorine resources.
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 Cleaner Production
·
2024
·
IF 9.7
Lili Yang,Chong Li,Yun Da,Jinrui Zhang,Gang Wang
Concentrated solar power (CSP) is a green energy technology that efficiently harnesses solar energy. Solid particles constitute the key medium for solar photothermal conversion and storage. However, drawbacks such as high thermal radiation loss and poor high-temperature stability limit their application. This paper proposes solid particles based on steel slag for highly efficient and durable selective sunlight absorptance and thermal storage. Raw pellets are obtained via a simple extrusion and rolling process, and sinter them to derive solid particles. These particles exhibit excellent selective solar absorption characteristics and have good potential for efficient heat storage. The average solar absorption of the solid particles sintered at 1310 °C reaches 93.20%, and the emissivity at 700 °C is 80.25%. Furthermore, the specific heat and the thermal conductivity of wafer-like materials are 1.09 J/(g·K) and 2.92 W/(m·K), respectively. In addition, the solid particles are arranged for exhaustive and harsh high-temperature durability tests, and they exhibit an ultra-stable solar weighted absorptance of 93.25 ± 0.09% (mean ± standard deviation), excellent resistance to thermal shock, and superior abrasion resistance. Moreover, the low cost and simplicity of the process greatly enhance the scalability of steel-slag-based solid particles. In summary, by innovatively addressing the challenges faced by solid particles, such as high radiative heat loss, poor heat storage capacity, and high-temperature instability, this study accumulates an advantage in the competition with phase-change and thermochemical materials, and greatly improves the feasibility of using solid particles in large-scale applications.
研究领域:
材料科学
·
可再生能源
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Xiuli Wang,Xiaomin Cheng,Yuanyuan Li,Ge Li,Jun Xu
A self-assembly method is introduced to prepare composite phase change materials (PCMs) consisting of 1-octadecanol (OD) and graphene. The shape stability and thermal properties of 1-octadecanol/graphene composite PCMs with three-dimensional network structure are investigated. Graphene is dispersed evenly in OD matrix and the three-dimensional network structure is getting tighter with increasing ratio of graphene. OD is completely encapsulated at relatively low amount of graphene about 1.5 wt%. XRD and Raman results show that the combination between OD and graphene is physical adsorption. The 1-octadecanol/graphene (OG) composite phase change materials possess excellent shape stability, which can prevent the leakage of molten OD during phase transition. In addition, around 99.3% phase change enthalpy of pure OD is maintained by connected network structure of graphene while the melting and solidifying temperature merely have small fluctuations. The thermal conductivity of composite phase change material with 1.5 wt% graphene increases to 0.358 W/(m K), which is 1.5 times higher than that of pure OD. Furthermore, the porous network of graphene can delay the evaporation and thermal decomposition point of the composite phase change materials, thus extending the operating temperature of OD efficiently. This work provides a promising way to encapsulate low-temperature organic phase change materials with little carbon additives, and enhance the thermophysical properties of base materials simultaneously.
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
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2019
·
IF 3.488
Biao Feng,Li-Wu Fan,Yi Zeng,Jing-Yu Ding,Xue-Feng Shao
Molecular dynamics (MD) simulations were performed to give insights into the effects of hydrogen bonds (HBs) on the melting process and heat conduction of erythritol as a promising latent heat storage material. First, among four force fields (GAFF, GROMOS, OPLS and CHARMM), the applicability of GROMOS force field was verified by comparing the predicted density and heat capacity of erythritol at various temperatures of interest with the measured values. The microscopic melting process of erythritol was simulated using the interface/NPT method, leading to a predicted melting point of ~394 K that agrees well with the measured value (~392 K). It was demonstrated that the variation of HBs energy associated with changes of molecular structure is the primary contribution to the latent heat. Upon melting, the strong inter-molecular HBs in solid erythritol break off and form weaker intra- and inter-molecular HBs in the liquid phase. In addition, non-equilibrium MD simulations were performed to study the microscopic heat conduction in erythritol molecules and to examine the dependence of the van der Waals (vdW) and Coulomb heat currents on the interatomic distance. It was revealed that the heat transfer capability of HB interactions is better than those of the Coulomb or vdW interactions. In the solid phase, the amount of heat transfer through HBs becomes greater with increasing the number of HBs. The results shed light on a promising approach to improving the latent heat storage capacity and thermal conductivity of erythritol (and other sugar alcohols) by manipulating the number and strength of HBs.
研究领域:
材料科学
·
分子动力学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-8
·
IF 3.998
Chang Chao,Wang Zongyu,Fu Benwei,Ji Yulong
Solar energy as an abundant renewable resource has been investigated for many years. Solar thermoelectric conversion technology, which converts solar energy into thermal energy and then into electricity, has been developed and implemented in many important fields. The operation of solar–thermal–electric conversion systems, however, is strongly affected by the intermittency of solar radiation, which requires installation of thermal storage subsystems. In this work, we demonstrated a new solar–thermal–electric conversion system that consists of a thermoelectric converter and a rapidly charging thermal storage subsystem. A magnetic-responsive solar–thermal mesh was used as the movable charging source to convert incident concentrated sunlight into high-temperature heat, which can induce solid-to-liquid phase transition of molten salts. Driven by the external magnetic field, the solar–thermal mesh can move together with the receding solid–liquid interface thus rapidly storing the harvested solar–thermal energy within the molten salts. By connecting with a thermoelectric generator, the harvested solar–thermal energy can be further converted into electricity with a solar–thermal–electric energy conversion efficiency up to 2.56%, and the converted electrical energy can simultaneously light up more than 40 orange-colored LEDs. In addition to stable operation under sunlight, the charged thermal storage subsystem can release the stored heat and thus enables the solar–thermal–electric system to continuously generate electricity after removal of solar illumination.
研究领域:
能源科学
·
材料科学
·
可再生能源技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）