CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yichao Gong,Jiarui Li,Lin Liu,Zhaokun Li,Longchao Zhuo,Guojun Zhang
Multiphase composites of lithium ceramics have emerged as a prominent area of research in the development of advanced solid tritium breeding materials. In this study, Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles were prepared through an in-situ reaction between Li 4 SiO 4 and TiO 2 . The objective of this study is to enhance the thermal cycling stability of Li 4 SiO 4 by impeding the grain boundary migration of Li 4 SiO 4 under high temperature conditions. The effects of the in-situ generated Li 2 TiO 3 /Li 2 SiO 3 particles on the microstructure, crush load and thermal cycling stability of Li 4 SiO 4 ceramic pebbles were investigated. The in-situ formed Li 2 TiO 3 and Li 2 SiO 3 particles effectively hindered the grain growth and minimized the formation of large intracrystalline pores in Li 4 SiO 4 . At a sintering temperature of 900 °C, the Li 2 TiO 3 /Li 2 SiO 3 particles are beneficial in increasing the crush load of Li 4 SiO 4 ceramic. However, at lower sintering temperatures, their impact was counterproductive. An increase in the volume fractions of the Li 2 TiO 3 /Li 2 SiO 3 had a positive effect on grain refinement but a negative effect on crush load. The Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles exhibited excellent structural stability during thermal cycling. The optimum mechanical stability was achieved at a TiO 2 addition of y = 0.1. The in-situ generated fine second phase particles effectively impeded grain boundary migration at high temperatures, providing a viable strategy for improving the thermal stability of Li 4 SiO 4 tritium breeders.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Cheng Liu,Yigang Ding,Jinhe Sun
Compared with single phase change materials (PCMs), organic-inorganic composite PCMs exhibits superior properties. Such as enhanced chemical stability, maintaining high energy storage density during thermal cycles. In this paper, a novel inorganic-organic composite PCM is synthesized with lithium nitrate (LNH) and acetamide (AC), which thermophysical properties are investigated systematically. The impact of α-Al 2 O 3 , β-Al 2 O 3 , expanded vermiculite, expanded graphite, boron nitride and bentonite on the energy storage density and cycle stability of composite PCM is examined intensively. The energy storage density of the composite PCM augmented with 1 wt% bentonite exhibits an increase rather than a decrease. After 100 cycles, a comparison of the data reveals that the average melting enthalpy of the PCM with bentonite (149.2 J·g −1 ) is 14.1 % higher than that without bentonite (124.2 J·g −1 ). The average enthalpy of solidification (150.8 J·g −1 ) is 21.4 % higher than that (130.7 J·g −1 ). Furthermore, the fluctuation range of the melting point and the freezing point is significantly reduced from 381.6 K–402.8 K and 313.8 K–402.2 K to 402.5 K–404.3 K and 393.8 K–403.9 K, respectively. The deviation of the melting temperature and latent heat after 100 cycles is <0.2 % in comparison to the initial value. The heat storage and release process of composite PCM in macro quantity is studied by step cooling curve test and computational fluid dynamics numerical simulation. It is confirmed that the LNH-AC/bentonite composite PCM not only has excellent long-term cycle stability, but also has no supercooling. LNH-AC/bentonite system is one of excellent candidates for solar heat storage.
研究领域:
材料科学
·
热能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Cheng Liu,Yi Zhang,Pengrui Zhang,Yigang Ding,Jinhe Sun
A multitude of composite phase change materials (PCM) systems have been developed, resulting in significant advancements in the efficiency of solar thermal storage systems. However, there is a paucity of inorganic-organic composite PCMs systems, and the phase change mechanism remains unclear, which significantly constrains the deployment and advancement of this category of PCMs. To address this gap in the literature, this team has developed a novel organic-inorganic composite PCM system using 30 wt% Mg(NO 3 ) 2 ·6H 2 O (MNH) and 70 wt% propanamide (POA) as raw materials. The thermal physical properties of the PCMs were initially analyzed, and the results demonstrated that the PCMs exhibited favourable latent heat and thermal cycling stability. The melting point was found to be 376.2 K, with a latent heat of melting of 131.93 J·g −1 . It was observed that the melting temperature and latent heat remained essentially unaltered after 500 cycles. Subsequently, the structure of the PCMs was analyzed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Ultimately, the interaction between liquid MNH and POA was modeled using molecular dynamics, allowing for a deeper understanding of the phase transition mechanism. It is hypothesized that the hydrogen bonds (HBs) between the two substances affects the physical bond, and that HBs contribute to the PCMs having good stability and a high thermal decomposition temperature. The rational mechanism of this phenomenon is explained from many aspects, including structure, Hirshfeld surface and thermal analysis. It is anticipated that the discovery of this new PCMs will facilitate large-scale applications in solar energy storage.
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
Small
·
2024
·
IF 13
Kaichen Wang,Keyu Tao,Feng Ye,Tieying Wang,Chao Xu
Addressing critical issues such as high-temperature corrosion, leakage, degradation, and subpar cyclic performance is imperative for phase change materials (PCMs), prompting the development of appropriate encapsulation techniques to surmount these challenges. In this study, a dual encapsulation strategy is proposed for high-temperature micro PCM particles. Al–Si core is microencapsulated via the “solvent evaporation-heating curing” method. Subsequently, TiO 2 is employed as the skeleton material for form-stable encapsulation of PCM microcapsules by “cold pressed sintering”. Detailed analysis of the crystalline phase transformation mechanism in the sintering synthesis pathway of TiO 2 underscore its potential as a robust structural material with exceptional thermal stability. Furthermore, the incorporation of hexagonal boron nitride (hBN) results in a substantial enhancement of the thermal conductivity of the composites, increasing by 121.1–131.3%. The prepared form-stable phase change microcapsules (FSPCMs) are subjected to 5000 thermal cycles in the air atmosphere. There is no observed PCM leakage or composite ruptures in the FSPCM. Moreover, the oxidized mass gain is merely 3.3%, signifying exceptional oxidation resistance. Thermophysical analysis indicates that FSPCM can retain 91.3% of the enthalpy after 2000 cycles, with over 80% preservation after 5000 cycles, underscoring its remarkable cyclic thermal durability.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 138
·期 1
·233-241
·
IF 2.471
Wei Sheng,Duan Zhijun,Xia Yongpeng,Huang Chaowei,Ji Rong,Zhang Huanzhi,Xu Fen,Sun Lixian,Sun Yixin
High-performance phase change materials (PCMs) are regarded as a promising strategy in thermal energy storage applications. However, pure PCMs exhibit some inherent disadvantages such as leakage, low thermal conductivity and poor thermal cycling stability. Herein, this work presents novel microencapsulated PCMs with nano-Al 2 O 3 -enhanced shell materials due to the high thermal conductivity and mechanical properties of nano-Al 2 O 3 . And nano-Al 2 O 3 was contributed uniformly to the shell materials through self-assembly of functional materials, forming a connected thermal conductive network for the microencapsulated PCMs and resulting in an enhancement on the thermal conductivity of the microencapsulated PCMs. Results show that thermal conductivity of the obtained microencapsulated PCMs with 8 mass% nano-Al 2 O 3 is improved up to 0.5977 W m −1 k −1 which is about 287.4% compared with that of the pure PCMs. Moreover, the obtained microcapsules enhanced by nano-Al 2 O 3 possess good phase change behavior and excellent thermal cycling stability, whose melting enthalpy can achieve 170.5 J g −1 and almost has no change after 12 times of thermal cycles.
研究领域:
材料科学
·
热能储存技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 2
·205
·
IF 4.501
Haodong Tang,Xiali Zheng,Yun Yu,Jinxin Liang,Yifan Zheng,Zongjian Liu
SiO2encapsulated SnZnCu microspheres (several micrometers to about 30 μm in diameter) with very low undercooling, narrow freezing/melting range, and high thermal cycling stability have been produced and used as the temperature stabilizer of the packed bed in highly exothermic Fischer–Tropsch reaction. The core–shell structured SnZnCu@SiO2microspheres are prepared in a two-step way, namely SnZnCu microspheres are firstly produced via a molten LiCl–KCl–CsCl eutectic-based metal emulsion method, and then a sol–gel approach is employed to coat them with a uniform, anti-leakage SiO2layer. It is found that raising the amount of Zn to 4.0 at.% is critical for achieving a very low undercooling (<5 °C for SnZn0.04Cux@SiO2vs. about 84 °C for Sn@SiO2) and a narrow freezing/melting peak width, and both undercooling and peak width are almost unchanged as the Cu content (x) increases from 1.5 to 3.0 at.%. However, their thermal cycling stability depends positively on the amount of Cu and can be remarkably improved when 3.0 at.% Cu is added. The results also show that low undercooling and narrow freezing/melting peak width are associated with the formation of Sn–Zn–Cu ternary eutectic and metastable phase Cu5Zn8, and poor thermal cycling stability of SnZn0.04Cux@SiO2microspheres with low Cu content is related to the decomposition of Cu5Zn8during thermal cycling. By embedding thermally stable SnZn0.04Cu0.03@SiO2microspheres into the Co/SiO2catalyst for Fischer–Tropsch synthesis, the temperature gradient in the catalyst bed can be significantly reduced by suppressing the formation of hot spots or thermal runaway and thus rapid deactivation of Co catalyst that occurs in the SnZn0.04Cux@SiO2-absent Co/SiO2catalyst can be avoided.Keywords:exothermic reaction;microcapsules;phase change materials;SiO2;Sn–Zn–Cu
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Henghua Zhang,Qianbin Dong,Juetian Lu,Yaping Tang,Wenjian Bi,Yue Gao,Hui Yang,Jiabang Wang
In this study, sodium acetate trihydrate was modified with urea, ethylene glycol, and disodium hydrogen phosphate dodecahydrate. The modified phase change material was impregnated into expanded perlite to obtain a composite phase change material, which was encapsulated with epoxy resin as the coating to obtain a coated composite phase change material with a phase change temperature of 46.4 °C, a latent heat of phase change of 132.7 J/g, and a low supercooling temperature of 0.6 °C. Leak tests and thermal cycle stability showed that the coating could effectively slow down the escape rate of the liquid phase and solve the macroscopic leakage problem. Moreover, the decrease in latent heat was only 1.8 % after 100 cycles, demonstrating excellent thermal cycle stability. The morphology and elemental distribution of the modified phase change materials and coatings were studied. In addition, laboratory insulation simulation tests were conducted, and the coated composite phase change material panels showed a significant delay in temperature reduction, while the insulation box showed longer lasting thermal performance. The excellent properties of the material find their application in radiant floor heating systems and play a key role in the expansion of coated phase change materials.
研究领域:
建筑材料学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 5
·629-640
·
IF 2.889
Gong Yichao,Liu Lin,Qi Jianqi,Yang Mao,Li Junjie,Wang Hailiang,Guo Hao,Zhang Guojun,Lu Tiecheng
Hetero-element doped lithium orthosilicates have been considered as advanced tritium breeders due to the superior performances. In this work, Li 4 Si 1− x Ti x O 4 ceramics were prepared by proprietary hydrothermal process and multistage reactive sintering. The reaction mechanism of Li 4 Si 1− x Ti x O 4 was put forward. XRD and SEM analyses indicate that insertion of Ti leads to lattice expansion, which promotes the grain growth and changes the fracture mode. The compressive tests show that the crush load increases almost four times by increasing x from 0 to 0.2. However, the thermal conductivity and ionic conductivity are the best when x = 0.05 and x = 0.1, respectively. Thermal cycling stability of Li 4 Si 1− x Ti x O 4 pebbles was further appraised through investigating the changes of microstructure and crush load. After undergoing thermal cycling, the Li 4 Si 1− x Ti x O 4 still show higher crush load compared with Li 4 SiO 4 , despite Ti segregation in some samples. The x = 0.05 sample exhibits excellent thermal cycling stability. In summary, proper amount of Ti doping can improve the crush load, thermal and ionic conductivity, and thermal cycling stability of Li 4 SiO 4 .
研究领域:
材料科学
·
核能技术
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Wang Lei,Tian Yanting,Li Zhanfeng,Zhu Jiping,Bian Tianlong
La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) perovskite with good stability and high oxygen diffusion coefficient has been extensively studied as oxygen electrode in reversible solid oxide cells (RSOCs). Significant promotion of oxygen reaction kinetics of the LSCF oxygen electrode was achieved by the addition of Ca x Co 4 O 9+δ (CCOx, x = 3, 1.5) nano-catalysts in the present study. The La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ -Ca 1.5 Co 4 O 9+δ (LSCF-CCO1.5) electrode exhibited the optimal electrochemical property among the LSCF-based electrodes and the lowest polarization resistance ( R p ) of 0.039 Ω·cm 2 was attained at 800 °C, which was ~ 97% lower than that of the LSFM electrode. Furthermore, the LSCF-CCO1.5 oxygen electrode also manifested excellent thermal cycling stability and alternating polarization durability. The hydrogen production rate of the LSCF-CCO1.5 electrolytic cell was 946 mL·cm −2 ·h −1 at 1.5 V at 800 °C, which was 2.6 times higher than that of the LSCF cell (362 mL·cm −2 ·h −1 ). The results certified the enhancement of electrochemical properties for LSCF oxygen electrode by the addition of CCOx nano-catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2025
·
IF 6.4
Yue Liu,Tianen Chen,Xinyu Song,Lin Han,Fanbin Meng,Shifeng Wang
Energy is indispensable in modern society. Solar Photovoltaic (PV) technology has gained increasing popularity due to its notable power generation advantages. However, PV modules face a critical “temperature-efficiency” contradiction during energy conversion: only about 20% of solar radiation is converted into electricity, while the remaining energy accumulates as heat, leading to significant performance degradation. To address this issue, our experiment employs a novel cooling technology-phase-change microcapsule cooling. By utilizing the heat absorption and release during the phase transition of the microcapsules, the temperature of PV modules is effectively regulated. Furthermore, the phase-change microcapsules designed in this work innovatively introduce paraffin as a secondary shell material, which improves thermal cycling stability. After 200 thermal cycles, the enthalpy loss remains negligible, with a retained enthalpy of 188.8 J/g. The microcapsules were applied to the back of PV modules, and field tests were conducted in Lhasa (91°06′ E, 29°36′ N). The results show a maximum temperature reduction of 16 °C (average: 4.66 °C) on the front side and 15 °C (average: 4.33 °C) on the back side, along with an increase in Pmax (P max ) of up to 11.11% (average: 4.55%). This study not only advances the development of bio-inspired encapsulation techniques for novel phase-change microcapsules, but also provides an innovative thermal-management solution for PV modules operating in extreme environments.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shu Hong,Yu Zhang,Zhenbo Liu,Chenming Liu,Henrikki Liimatainen,Xueqing Lian
Phase-change materials (PCMs) offer an appealing strategy for passive thermal energy storage, but conventional PCMs often suffer from limitations in thermal performance, supercooling, and structural stability. Herein, we engineered adjustable PCM nanocapsules deploying a novel ternary deep eutectic solvent (DES) system composed of capric acid, palmitic acid, and octadecane. The DES formulation exhibited a notably high latent heat of fusion of 225.1 J/g and phase-transition temperatures precisely tuned to the human comfort range ( T m = 23.5°C, T f = 22.6°C), surpassing many previously reported DESs (typically ≤ 207.2 J/g). The optimized DES was further encapsulated within a cross-linked chitosan shell to create nanocapsules with an average size of 240 nm with a high encapsulation efficiency (> 92%). These nanocapsules retained a latent heat of 207.0 J/g, among the highest reported for encapsulated PCMs, and exhibited exceptional thermal cycling stability over 100 heating/cooling cycles, with negligible phase-transition temperature shift and no observable leakage. Structural analyses confirmed successful DES encapsulation and uniform shell formation. The superior thermal storage capacity, structural integrity, and sustainability of the developed PCM nanocapsules establish them as strong candidates for next-generation smart thermal management systems in buildings and other advanced applications.
研究领域:
材料科学
·
热力学
·
纳米技术
·
可持续能源
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Yang Hongxin,Zhang Yuan,Liu Zhipeng,Hu Chunfang,Li Junbiao,Liao Hailong,Shao Minhua,Ni Meng,Chen Bin,Shao Zongping,Xie Heping
Thermo-mechanics of cathode is closely related to the durability of high-temperature solid oxide fuel cells (SOFCs), with two main mechanical failures during thermal cycling: interface delamination and bulk cracking of cathode. Bulk cracking, caused by insufficient fracture strength/stiffness is a big concern but often overlooked. Here, we introduce chemical hydration to offset the thermal expansion, enhancing the cathodic mechanical stiffness and fracture strength, thus promoting the thermo-mechanical durability of cathode in proton ceramic fuel cells (PCFCs). Such chemical-induced expansion offset is achieved by strengthening intergranular bonding inside the bulk cathode after the hydration, preventing granule detachment during thermal shrinkage. As a demonstration, the stiffness-enhanced air electrode (BaCo 0.7 Ce 0.15 Y 0.15 O 3 , noted as s-BCC-Y) exhibits 86% enhancement of fracture strength, thus thermal cycling stability with almost no degradation after 35 harsh thermal cycles between 600 and 300 °C, surpassing pristine BaCo 0.7 Ce 0.3 O 3 and many cobalt-free PCFC cathodes. Benefitted from the improved stiffness of cathode, full cell with the s-BCC-Y electrode demonstrates enhanced power output. This work highlights the importance of bulk cathode thermo-mechanics in developing robust SOFCs for high temperature energy applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）