CELLULOSE
·
2019
·Vol. 26
·期 8
·4815-4825
·
IF 3.917
Yang Xixian,Li Shijie,Zhang Shiyi,Chen Xin,Peng Shuai
Abstract Commonly used nanocarbon composite materials are routinely synthesized from petroleum-based resources. To avoid their bad impact on the environment, using cellulose-based materials as the promising resources is a better choice due to its easy acquisition and rich reserves. In this study, microcrystalline cellulose was selected as the carbon precursor to synthesize novel cellulose-derived 3D-graphene/LiOH·H 2 O nanomaterials for chemical heat storage to improve the efficiency of thermal energy utilization. The characterization and performance test results show that LiOH·H 2 O particles (5–20 nm) were highly dispersed on the 3D graphene carbon skeleton. These materials had excellent heat storage densities and thermal conductivities due to a completely new, hydrophilic, nano-reactive interface on 3D graphene. Among the materials, 3D-GF-VC-LiOH·H 2 O (Ascorbic acid-modified 3D-graphene/LiOH·H 2 O) exhibited the best heat storage and thermal conductivity properties. It achieved a thermal conductivity of 2.6 W/m K, which was 1.5 times that obtained with pure LiOH·H 2 O, and its heat storage density (2157 kJ/kg) was 3.3 times that of pure LiOH·H 2 O (661 kJ/kg). The activation energy could decrease to 27.5 kJ/mol. Moreover, the heat storage temperature range of LiOH·H 2 O was clearly expanded by introduction of 3D graphene. Hence, the addition of cellulose-derived 3D graphene is a very efficient means by which the design of chemical heat storage materials can be improved. Graphical abstract
研究领域:
材料科学
·
能量存储
·
纳米技术
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 9
·3373
·
IF 3.748
Xifeng Lv,Xuehua Shen,Luxiang Zhang,Yazhou Wang,Fang Wang
The serious phase separation in inorganic phase change materials, and easy leakage of organic phase change materials are the main obstacles to the practical batch application of phase change heat storage materials. To solve these problems, in this work, emulsion polymerization is introduced as the method for preparing organic-inorganic coupling phase change material (oic-PCM) with high heat storage performance using polyacrylamide (PAM) as the wall material and organic phase change material of cetyl alcohol as the core material, and diatomite is used as a supporting substrate to absorb inorganic sodium sulfate decahydrate (SSD). A differential scanning calorimeter (DSC), X-ray diffractometer (XRD), dust morphology and dispersion analyzer, and thermal conductivity tester were used to characterize the prepared organic-inorganic coupled phase change materials and investigate their performance. The research results show that when the mass fraction of cetyl alcohol is 68.97%, the mass fraction of emulsifier is 3.38%, and the mass fraction of sodium sulfate decahydrate/diatomite is 3.40%. The phase change latent heat of the organic-inorganic coupled phase change material is as high as 164.13 J/g, and the thermal conductivity reaches up to 0.2061 W/(m·k), which proves that the prepared organic-inorganic coupled phase change material has good heat storage performance, showing its good application prospects.Keywords:phase change heat storage;emulsion polymerization;cetyl alcohol;diatomite;organic-inorganic coupling
研究领域:
材料科学
·
化学工程
·
储能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yuan Lu,Xiudi Xiao,Yongjun Zhan,Changmeng Huan,Shuai Qi,Haoliang Cheng,Gang Xu
Paraffin wax (PW) is widely used for smart thermoregulation materials due to its good thermal performance. However, the leakage and low thermal conductivity of PW hinder its application in the heat storage field. Accordingly, developing effective methods to address these issues is of great importance. In this study, we explored a facile approach to obtain PW-loaded core-sheath structured flexible nanofibers films via coaxial electrospinning technique. The PW as the core layer was successfully encapsulated by the sheath-layer poly(methyl methacrylate). The diameter of the fiber core increased from 395 to 848 nm as the core solution speed rate increased from 0.1 to 0.5 mL/h. In addition, it can be seen that higher core solution speed rate could lead to higher PW encapsulation efficiency according to the transmission electron microscopy results. The core-sheath nanofiber films, moreover, possessed the highest latent heat of 58.25 J/g and solidifying enthalpy of –56.49 J/g. In addition, we found that after 200 thermal cycles, there was little change in latent heat, which demonstrated that it is beneficial for the PW-loaded core-sheath structure to overcome the leakage issue and enhance thermal stability properties for the thermoregulation film.
研究领域:
材料科学
·
热能工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale and Microscale Thermophysical Engineering
·
2017
·
IF 3.182
Shijie Li,Hongyu Huang,Xixian Yang,Chenguang Wang,Noriyuki Kobayashi,Mitsuhiro Kubota
Mg(OH)2 nanoparticles anchored on graphene oxide (GO) were facilely prepared by a hydrothermal method. The main diameter scale of nanoparticles on the graphene sheet was about 25–50 nm shown by transmission electron microscopy characterization results. X-ray diffraction results indicated that the nanoparticles are in accordance with the data on magnesium hydroxide. This material exhibited significantly improved heat storage capacity and a higher hydration rate than pure magnesium oxide, and the introduction of GO leads to greatly increased thermal conductivity of the nanocomposites. As a novel thermochemical heat storage material, Mg(OH)2/GO has huge potential for high-efficiency energy systems.
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
RENEWABLE ENERGY
·
2017
·
IF 4.357
Zhaoli Zhang,Yanping Yuan,Nan Zhang,Qinrong Sun,Xiaoling Cao,Liangliang Sun
A novel eutectic of Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 improved by LiF, when employed as a heat transfer fluid in concentrating solar power systems, is prepared to eliminate the disadvantage of limited operating temperature range and low specific heat as well as thermal conductivity . Using the static melting method, Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 with 15.0 wt.% LiF which is simply physical mixture determined by X-ray diffraction, is chosen as the optimized candidate. Results indicate that, at 10 °C/min of heating rate , LiF-Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 reached melting point of 368 °C and upper temperature limit of 753 °C, allowing it to be effectively employed in thermal storage and heat transfer in high temperature CSP systems. During temperature range from 400 to 600 °C, the liquid quaternary exhibited notably mean specific heat of 1.917 J/(g·°C), which is larger than that of the original ternary eutectic. Thermal conductivity of solid LiF-Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 reached the stable level of 1.021 W/(m·°C) at 320 °C. Density of improved eutectic tested by the archimedean principle is approximately 1.95 g/cm 3 . In conclusion, LiF-Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 can be employed as the admirable heat transfer fluid for thermal storage and heat transfer in high-temperature CSP plants. This investigation will provide useful information for further improvement of molten salt based heat transfer fluids.
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
Energies
·
2024
·Vol. 17
·期 20
·5033
·
IF 3
Yutong Xiao,Siyu Wei,Yuanyi Yang,Chunhao Wang,Shanbi Peng
As a passive solar design technology, the Trombe wall can improve buildings’ energy efficiency and thermal comfort. However, the traditional Trombe wall heating efficiency is low and cannot meet the needs of continuous night heating of the building. To solve these problems, a new type of sheet-like composite adsorbent is proposed in this study, prepared from calcium chloride supported by a rock wool board, a high-porosity building material. The high adaptability of rock wool board to the building wall makes it possible for the composite adsorbent to be directly applied to the Trombe wall. The results show that the macroporous structure of the rock wool board provides a wealth of space for loading hydrated salts. The smaller the density and thickness, the more calcium chloride the rock wool board can carry, speeding up the absorption/deportation process. The rock wool slab-based calcium chloride composite adsorbent has a maximum adsorption capacity of 51% and a heat storage density of about 838 J/g. Achieving the desorbed balance within 8 h and applying it to the Trombe wall is expected to attain continuous heating of buildings and has significant potential in building energy conservation.
研究领域:
建筑材料
·
太阳能技术
·
能源储存
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Jinjie Mo,Ziye Ling,Zhengguo Zhang,Xiaoming Fang
In this paper, we investigate a metal composite prepared using a one-step pressing method, where Al–Si alloy acts as the phase change materials (PCMs) and Al 2 O 3 /AlN serve as the structural support materials. The alloy formation and PCM composite preparation are synthesized in a single step. The study aims to characterize the microstructure, thermodynamic, and thermal properties of the composite material. To assess the heat storage properties of the prepared composite PCMs at temperatures higher than 600 °C, a high-temperature test system is established using a high-frequency induction heater. Additionally, we explore how to improve the issue of liquid leakage under high-temperature conditions. The results demonstrate that Al 2 O 3 and AlN (ceramic materials) exhibit excellent chemical compatibility with Al–Si composite PCMs. After sintering, the ceramic materials form a strong bond with Al–Si, effectively retaining the liquid phase of Al–Si alloy within the composite material. Consequently, the Al–Si composite PCMs do not exhibit high-temperature liquid leakage under elevated conditions. Both Al 2 O 3 /Al–Si and AlN/Al–Si composites possess favorable high temperature heat storage properties. The phase change enthalpy of Al 2 O 3 /Al–Si composite reaches 400 kJ/kg, with a thermal conductivity of 36 W/(m·K). Similarly, the AlN/Al–Si composite achieves a phase change enthalpy of 404 kJ/kg and a thermal conductivity of 43 W/(m·K). Both composites fulfill the requirements for high-temperature heat 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
APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Lisheng Deng,Shusen lin,Linfa Xiao,Mitsuhiro Kubota,Hongyu Huang,Jun Li,Dezhen Chen
The application of MgO/Mg(OH) 2 in heat storage technology has been limited due to slow hydration rate and easy agglomeration. In this paper, nanoporous carbon particle (NCP) as a carrier was used to prepare NCP/MgO chemical heat storage composite materials by impregnation and calcination methods, respectively. The microstructure characterization, hydration reaction, and simultaneous thermogravimetric analysis experiments were carried out on the prepared composite materials. The results showed that the internal distribution of MgO in the composite material prepared by calcination method was more uniform, and the particle size of MgO was smaller. Under the conditions of 110 ℃ hydration temperature and 57.8 kPa water vapor partial pressure, the hydration conversion ratio of the composite material prepared by calcination method after 120 min of hydration conversion ratio reached 93 %, which was 17.7 % higher than that of the impregnated composite material and 50 % higher than that of pure MgO. Under the comprehensive influence of specific surface area, pore structure, and active component particle size, compared with pure materials and impregnated composite materials, the dehydration rate of the composite material prepared by calcination method at 300 ℃ was twice that of impregnated method and 6 times that of pure MgO, and the heat storage density reached 1039kJ/kg. After 10 cycles, the heat storage density still maintained an initial state of 95.8 %. Compared with pure materials and impregnated composite materials, NCP/MgO composite materials prepared by calcination method had better heat storage performance and higher cyclic stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7058-7074
·
IF 3.343
Zhiwei Yang,Zijuan Yang,Jinhong Li,Yong Deng,Lijie Liu,Xuezhu Luan,Kaiyue Huang
Summary In this work, diatomite (DM) was calcined at 400°C to obtain the pure surface and pores (DM-1); then, the three kinds of shape-stable composite phase change materials (ss-CPCMs) of CaCl 2 ·6H 2 O (CCH)/DM-1, CH 3 COONa·3H 2 O (SAT)/DM-1, and Na 2 SO 4 ·10H 2 O (SSD)/DM-1 were prepared by impregnation method. The hydrated salts were uniformly adsorbed on the surfaces and into the pores of DM-1 by capillary action and surface tension. The addition of nucleating agent effectively reduced the supercooling degrees of hydrated salts, and the heterogeneous nucleation mechanism was employed to explain the supercooling suppression. The results showed that the supercooling degrees of the three hydrated salt ss-CPCMs with optimal nucleating agent were less than or equal to 0.6°C. Moreover, the thermal conductivities of ss-CPCMs were significantly improved by adding graphite, and the addition of 10 wt% graphite could increase the thermal conductivity of hydrated salt ss-CPCMs by at least 70%. The package capacity of CCH, SAT, and SSD in three ss-CPCMs with appropriate contents of nucleating agent and graphite was 58.1, 56.1, and 56.3 wt%, respectively. The DSC results showed that the phase change temperatures of the three ss-CPCMs were approximately 28.8 to 57.8°C, and the latent heat was approximately 108.7 to 149.4 J/g. The XRD and FT-IR results exhibited that the three ss-CPCMs indicated understanding chemical compatibility. In addition, the results of 200 melt-solidification cycles demonstrated that the ss-CPCMs had excellent thermal cycle reliability. Thus, the hydrated salt/DM-1 ss-CPCMs showed great potential as heat storage materials for various heat storage applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Siyu Wei,Wei Zhou,Rui Han,Jihui Gao,Guangbo Zhao,Yukun Qin,Chunhao Wang
Thermochemical heat storage has been successfully employed as a reliable solution for enhancing the utilisation of renewable energy. In this paper, we report novel composite sorbents fabricated by impregnating CaCl 2 into porous minerals with different structural properties. Sepiolite (SP), diatomite (DT), and expanded perlite (EP) were chosen as the mesoporous , macroporous , and foamed macroporous matrices, respectively. The pore structure of the matrix exerts a vital influence on the loading of salt hydrates and the performance of the composite material. EP/Ca had the highest energy storage density of 2166 J/g with a water exchange amount of 1.20 g/g, while the energy storage densities of SP/Ca and DT/Ca were 1026 J/g and 1520 J/g, respectively. The foamed macropores of EP provided more space for salt hydrate loading, whereas DT and SP only possessed mesoporous pores with limited pore volumes , thus contributing to lower salt hydrate content. Moreover, EP/Ca exhibited good structural stability during heat storage cycles because of the foamed macroporous structure. In contrast, the restrictive effect of the holes of DT on the salt solution was low, thus causing DT/Ca leakage and caking. Therefore, EP was chosen as the most suitable matrix for supporting salt hydrates. Moreover, this work presents an excellent perspective for exploring new sorption heat-storage materials with low cost, mass production, and high performance.
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 Nano Materials
·
2025
·
IF 5.5
Lu Lu,Jiayi Gu,Xing Wei,Zhenzhen Wei,Yan Zhao
Thermally stable separators, particularly those with a multifaceted and ultrawide range of thermal protection functions, are essential to the long-term safe operation of lithium-ion batteries (LIBs). In this work, we fabricate a sandwiched nanofibrous composite separator (PPPA) that integrates comprehensive thermal protection capacities of heat storage, shutdown, dimensional stability, and flame retardancy together, via a facile combination of coaxial-electrospinning polyacrylonitrile and poly(butylene succinate) nanofibrous membrane (PAN@PBS), spraying a mixture of poly(ethylene glycol) (PEG) and ammonium polyphosphate (APP), and folding techniques. The resultant PPPA separator is able to offer a fibrous network, high porosity, and superior electrolyte affinity. Meanwhile, the thermal protection of the PPPA separator starts with the phase-change heat storage of PEG at 60 °C. Then, the shutdown can be activated at 115 °C by the outer PBS melting of coaxial nanofibers, while the inner PAN maintains dimensional stability up to 250 °C. Further, self-extinguishing will occur in the event of fire due to the existence of APP. Moreover, PEG phase-change leakage of the composite separator can be overlooked due to the hydrogen bonds between PEG and APP and the entrapment of the upper and lower fibers. Furthermore, the PPPA separator demonstrates electrochemical performance that is on par with a commercial polyolefin separator, with higher ionic conductivity (2.49 mS cm–1) and lithium-ion transference number (0.32), as well as a cell discharge capacity retention of 92.4% after 100 cycles at 1 C. Therefore, given its excellent safety and satisfactory performance, PPPA composite separators are anticipated to be a potential separator for LIBs.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY AND BUILDINGS
·
2023
·
IF 6.7
Meng Jia,Aimin Sha,Wei Jiang,Xinzhou Li,Wenxiu Jiao
Currently, functional pavement materials become a research hotpot for road researchers. This paper aims to develop a phase change heat storage asphalt pavement material and then design phase change heat storage asphalt mixtures with active cooling ability. The synthesized polyurethane-based solid–solid phase change material (PUSSPCM) with suitable phase change temperatures, desirable thermal energy storage capacity and excellent phase change cycling stability can meet the active cooling demand of asphalt pavement. There are also excellent leakage resistance, volume stability and chemical stability that enable withstanding the harsh condition of asphalt pavement. Therefore, the PUSSPCM can be considered as a promising phase change filler. Subsequently, the phase change heat storage asphalt mixtures are prepared by the equal volume replacements of limestone filler with PUSSPCM. The replacements can improve the high-temperature stability and low-temperature cracking resistance whereas weaken the water stability of an asphalt mixture. When the replacement amount is no more than 40 vol%, the phase change mixtures can satisfy the pavement performance requirements. The replacements increase the heat absorption capacity but decrease the heat transfer rate, which leads to decrease in the temperature rising rate of the asphalt mixture with more PUSSPCM.
研究领域:
材料科学
·
土木工程
·
热能工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）