CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·690-696
·
IF 3.1
Xu Pengfei,Hua Yezhen,Jin Kangpeng,Xu Biao
Tin selenide(SnSe) material exhibits very excellent thermoelectric properties in both p- and n-type single crystals, benefiting from advantageous electronic structure and ultra-low lattice thermal conductivity. However, poor mechanical properties and time-consuming production limit its practical application, and polycrystalline SnSe has attracted great attention in recent years. Herein, the SnSe microplates are prepared by a facile solvothermal method and compacted by spark plasma sintering (SPS). With enhanced electrical conductivity( σ ) and optimized Seebeck coefficient( S ) benefited from the Sn vacancies and increased density of states effective mass by the incorporating of heavy rare earth element Gd, an enhanced power factor(PF) value of about 0.86 mW/(m·K 2 ) is realized in the p-type polycrystalline Sn 0.985 Gd 0.015 Se sample. Combined with the medium total thermal conductivity k tot and lattice thermal conductivity k lat of 0.7 and 0.56 W/(m·K), respectively, an enhanced peak dimensionless figure of merit( ZT ) of ca. 1.1 was achieved at 873 K along vertical to the SPS pressing direction. The average ZT was also improved as compared to that of the pristine SnSe sample.
研究领域:
材料科学
·
热电学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 51
·期 9
·2016-2023
·
IF 3.543
CaiFei Wang,ChunHua Zhao,JiaQin Sun,SanQing Huang,XiangDong Liu,Takeshi Endo
A fully bio-based benzoxazine, 3-furfuryl-8-methoxy-3,4-dihydro-2H-1,3-benzoxazine (Bzf), has been prepared using guaiacol, furfurylamine, and paraformaldehyde as raw materials. Its chemical structure has been characterized by 1H and 13C NMR, FTIR, and elemental analysis. The polymerization behavior of Bzf in the presence of methyl p-toluenesulfonate (PTSM) has been studied by FTIR and DSC, and the thermal stability of the cured resin has been evaluated by thermogravimetric analysis. It was found that PTSM is a good promoter that serves to avoid thermal decomposition of the bio-based monomer during the curing process at high temperature. In contrast to the situation with neat Bzf, the presence of PTSM (5 mol % for Bzf) significantly improves the polymerization behaviors, including a decrease in the polymerization temperature from 240 to 174 °C, a shortening of the time required to reach the gel point on heating at 200 °C from 47 to 20 min, and an increase in the char yield of the cured resin from 53 to 62%. Moreover, these observed experimental results on the promoting effect of PTSM are interpreted in terms of several possible mechanistic schemes, which involve a catalytic effect on the dissociation of C O bonds in both the coordination ring-opening reaction and the rearrangement from a phenoxy structure to a phenolic structure. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
研究领域:
高分子化学
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材料科学
·
热分析
·
绿色化学
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功能高分子
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2014
·
IF 5.261
Changzhong Chen,Wenmin Liu,Hongwei Wang,Kelin Peng
Three kinds of new polymeric SSPCMs with different crosslinking structures were synthesized and characterized for thermal energy storage. In the SSPCMs, three hexahydroxy compounds (sorbitol, dipentaerythritol and inositol) were individually employed as the molecular skeleton and polyethylene glycol (PEG) was used as the phase change functional chain. The molecular structure, crystalline properties, phase change behaviors, thermal reliability and stability of the synthesized SSPCMs were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermogravimetry (TG), respectively. The results show that the prepared SSPCMs possess high thermal energy storage density and an applicable temperature range of 30–70 °C, and the maximum phase change enthalpy in the heating and cooling process for the SSPCMs is 107.5 kJ/kg and 102.9 kJ/kg, respectively. The prepared SSPCMs have good reusability, excellent thermal reliability and stability from the heating-cooling thermal cycle test and TG curves. The resultant SSPCMs could be potentially applied in the areas of thermal energy storage and temperature-control.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiangqian Jiang,Chuncheng Ban,Ling Li,Han Li,Jiandong Hao,Weiping Chen,Xiaowei Liu
The Seebeck coefficient, electrical conductivity and thermal conductivity of thermoelectric materials are related but not independent, so it is difficult to improve the figure of merit value of thermoelectric materials. In the compound with nanometer grain size, a large number of surface interfaces and various defects in the material will increase the phonon scattering, resulting in the decrease of lattice thermal conductivity. Therefore, the nano-structure of the material is expected to increase its thermoelectric performance parameters. This work presents is based on the self-synthesized BN nano-materials, different structure of the thermoelectric cell composed of nanomaterial BN and thermoelectric material bismuth telluride are designed and analyzed, and its output voltage and power are simulated. Low dimensional BN nanomaterials with low thermal conductivity may contribute to reduce the overall thermal conductivity of the battery and improve the output efficiency. The thermoelectric coefficient of the thermoelectric battery is approximately calculated to be 1.22, which will satisfy the power supply requirements of some small power electronic equipment in practical application.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Xuan Zhang,Chenzhen Liu,Zhonghao Rao
The development of electric vehicles (EVs) is beneficial to a cleaner environment. As the powertrain of EVs, power battery is limited obviously by its fast operating temperature rise and large temperature variation among different parts, so an efficient battery thermal management (BTM) system is desirable. In this paper, a battery thermal management system using kaolin/expanded graphite (EG)/paraffin composite was designed. By contrasting different thermal properties of ternary composites with various proportions, the most suitable composite with 10 wt% EG and 10 wt% kaolin was selected for the thermal management testing, which has a conductivity of larger than 6 W/(m·K) and did not shows any visible leakage after 30 min at 60 °C. In the thermal management test, the temperature of a single battery was effectively controlled under 45 °C even at the discharge rate of 4C, and the temperature difference of the single battery was restrained within 5 °C. Besides, the composite had reduced the temperature of the battery pack by 25.77% at 4C rate, and the temperature difference of the battery pack or each battery in the pack could be greatly controlled once the phase change occurred. In conclusion, the excellent temperature controlling performance of the new phase change material (PCM) was verified in this paper, and the importance of reasonable dosage distribution of PCM in battery pack was put forward.
研究领域:
材料科学
·
能源工程
·
汽车工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoxiao Guo,Peng Tan,Hui Zheng,Yang Zhang,Liang Zheng,Peng Zheng,Xue-ao Zhang,Shujian Cheng
Polymer composites with high through-plane thermal conductivity and electrical insulation properties are in high demand as thermal interface materials (TIMs) for highly integrated electronics to enhance heat dissipation. However, technical difficulties in pre-controlling the alignment of fillers limit the effective enhancement of thermal conductivity in composite TIMs. Additionally, achieving both high thermal conductivity and electrical insulation performance presents a significant challenge due to their inherent incompatibility. In this study, vertical alignment of O 2 plasma treated mesophase pitch-based carbon fibers coated with Al 2 O 3 (V-Al 2 O 3 @PCF) within polyvinyl alcohol (PVA) was successfully achieved, which integrates functionalities of high through-plane thermal conductivity and electrical insulation. The resulting V-Al 2 O 3 @PCF/PVA composite exhibited an impressive through-plane thermal conductivity of 22.5 W m -1 K -1 , which is 150 times higher than that of pure PVA. This enhancement is attributed to the effective alignment of PCF, which, due to their diamagnetism-induced anti-magnetic forces, overcome gravitational energy and realign vertically. The Al 2 O 3 coating effectively reduces electronic migration between the PCF, allowing the V-Al 2 O 3 @PCF/PVA composite to exhibit a high electrical resistivity of 1.5 × 10 3 Ω·cm. In the application for cooling high-power electronics, the V-Al 2 O 3 @PCF/PVA composite reduced the temperature of LED by 10.2 °C, indicating its significant potential for applications in electronic packaging.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 22
·7956-7965
·
IF 5.7
Yuxuan Hou,Junjie Li,Ruowei Yin,Xiaopo Su,Yanjing Su,Lijie Qiao,Chuanbao Liu,Qian Li,Yang Bai
Development of microelectronic technology is highly desired to address chip power instability and micro-overheating in highly integrated devices utilizing a single material. For this purpose, we propose an efficient strategy by using a ferroelectric thin film to achieve the multifunction of chip power and thermal management. The Pb0.91La0.06Zr0.8Ti0.2O3 (PLZT) thin films undergo nucleation and growth in the (100) preferred orientation on the LaNiO3 bottom electrode during the layer-by-layer annealing process. The obtained chorogi-like structure with both lamellar and columnar nanocrystals results in a high breakdown strength of 4224 kV cm−1, accompanied by an exceptional recoverable energy storage density (Wrec) of 43.20 J cm−3. A large adiabatic temperature change (ΔT) of 27.25 K (@2000 kV cm−1) is obtained near the depolarization temperature, and the broad temperature span (80% ΔTmax) is larger than 50 °C. Moreover, PLZT thin films demonstrate a pyroelectric coefficient (π) of −145 μC cm−2 K−1 with high temperature stability, whose excellent thermal detection capability is confirmed by the infrared response measurement. Above all, the excellent energy storage, electrocaloric effect and pyroelectric properties of the PLZT thin films make them highly promising to inhibit the damage of abrupt current/voltage and uneven heat dissipation for applications in chip power and thermal management.
研究领域:
材料科学
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电子工程
·
能源技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·97036-97047
·
IF 3.289
Mei Wang,Jianling Xia,Jianchun Jiang,Shouhai Li,Mei Li
Dipentene-maleic anhydride (DPMA) was prepared by the Diels–Alder addition of dipentene with maleic anhydride. DPMA was converted via ammonolysis with para-aminobenzoic acid (PABA) to form N-(3-amino-benzoic acid)terpene-maleamic acid (ABDPMA), which was then converted to zinc soap (ABDPMA-Zn) or calcium soap (ABDPMA-Ca). Their chemical structures were confirmed by FT-IR and ICP-AES. Thermal stabilizing effects of ABDPMA-Ca/ABDPMA-Zn were compared with ABTMA-Ca/ABTMA-Zn (ABTMA: N-(3-amino-benzoic acid)tung-maleamic acid), C36DA-Ca/C36DA-Zn (C36DA: dimer fatty acid), ZnMA/ZnO (MA: maleic acid), EFC/ZnSt2/ESBO (EFC: calcium salt of epoxidised fatty acid; ESBO: epoxidised soybean oil, and CaSt2/ZnSt2 (St: stearic acid). Thermal stabilities of poly(vinyl chloride) (PVC) compounds were determined using Congo Red test, discoloration test, ultraviolet-visible spectroscopy analysis and thermogravimetric analysis. Dynamic mechanical and tensile properties of the PVC compounds were also studied. Besides better plasticization performance, ABDPMA-Ca/ABDPMA-Zn improved the long thermal stability of PVC compared with ABTMA-Ca/ABTMA-Zn, C36DA-Ca/C36DA-Zn, and CaSt2/ZnSt2.
研究领域:
高分子化学
·
材料科学
·
塑料加工
·
热稳定化
·
功能添加剂
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Yuyang Li,Guanghua Liu,Jiangtao Li,Kexin Chen,Gang He,Zengchao Yang,Yemao Han,Min Zhou,Laifeng Li
Bulk In-doped Cu 2 SnSe 3 samples were prepared by a fast and one-step method of high-gravity combustion synthesis . All the synthesized samples were dense with relative densities of >98%. The influence of Indium-doping on the phase composition of the samples was investigated. SEM and EDS measurements confirm the existence of SnSe and Cu 2 Se as secondary phase in the Cu 2 Sn 1−x In x Se 3 samples. In addition, the experimental results show that there is a solubility limit of indium in the Cu 2 SnSe 3 matrix. The thermoelectric properties of the samples were measured in a temperature range from 323 K to 773 K, and the Cu 2 Sn 0.8 In 0.2 Se 3 sample achieved a maximum ZT of 0.65 at 773 K, which was comparable with the best-reported result for Cu 2 SnSe 3 materials prepared by conventional sintering approaches. With much reduced time and energy consumption, high-gravity combustion synthesis may offer a more efficient and economical way for producing thermoelectric materials .
研究领域:
材料科学
·
无机非金属材料
·
热电转换
·
固态化学
·
功能材料
✓ 已验证
DOI
高影响因子
Results in Physics
·
2021
·
IF 4.476
Lin Bo,Yongpeng Wang,Wenying Wang,Lei Wang,Fujin Li,Min Zuo,Yanzhen Ma,Degang Zhao
The ternary Cu 3 SbSe 4 thermoelectric material with diamond-like structure exhibit good thermoelectric performance in the middle temperature region. In this study, the Cu 3− x Ni x SbSe 4 ( x = 0–0.03) materials were fabricated by melting-ball milling-hot pressing process. The influences of grain size and compositional gradient on the microstructure and thermoelectric properties of Cu 3− x Ni x SbSe 4 were evaluated. It is found that the electrical conductivity of Cu 2.97 Ni 0.03 SbSe 4 was about 33% higher than that of Cu 3 SbSe 4 sample, and the lattice thermal conductivity was reduced from 3.3 Wm −1 K −1 to 2.4 Wm −1 K −1 at room temperature due to the grain refinement and more V Se defects. The maximum zT value for the Cu 2.97 Ni 0.03 SbSe 4 sample was 0.62 at 650 K.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
热电材料
·
半导体材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 6
·3110-3123
·
IF 2.302
Li Jingang,Wu Zheyi,Sun Xiaoyu,Zhang Xianwen,Dai Rucheng,Zuo Jian,Zhao Zhi
In this paper, Eu 3+ -doped yttrium tungstate (Y 2 WO 6 ) nanophosphors with different morphologies have been synthesized by a hydrothermal method with the assistance of cetyltrimethyl ammonium bromide. X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and photoluminescence spectroscopy (PL) were used to characterize the products. The pH value of the starting solution plays a crucial role in the structures and morphologies of the samples. When the precursors synthesized under alkaline condition are annealed at 1100 °C in the air, the pure monoclinic Y 2 WO 6 phase can be obtained. The results of HRTEM and SAED are consistent with those of the XRD patterns, confirming the high crystallinity of the products. A detailed study of the optical properties, including the UV–Vis diffuse reflection spectra, the excitation and emission spectra, CIE coordinate, and color purity of Y 2 WO 6 :Eu 3+ nanophosphors with different doping concentrations, are presented here. The critical distance R
c and energy transfer mechanism for the concentration quenching of Eu 3+ ions are discussed in detail. In addition, the decay time and the thermal stability of the samples have been also investigated elaborately. The PL properties of the as-synthesized materials indicate promising applications in UV-pumped red light-emitting diodes.
研究领域:
材料科学
·
无机化学
·
纳米技术
·
光电子学
·
固体物理
·
稀土发光材料
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Senliang Xi,Peng Zhang,Yuanyi Fu,Kudzaishe Caren Tome,Tonghuan Zhang,Shixue Zhou,Youmin Guo,Hao Yu
In this work, two kinds of zeolites MCM-22 and SAPO-34 were synthesized by the hydrothermal method. The mixture systems of NaBH4 and different mass percentages of zeolite were prepared by ball milling, with no reaction between NaBH4 and the zeolite during the process, as shown by X-ray diffraction analysis. Thermal decomposition of NaBH4 and NaBH4 + zeolite for hydrogen release was investigated by temperature-programmed desorption, differential scanning calorimetry, and pressure composition isothermal methods. It is shown that the presence of zeolites can decrease the hydrogen release temperature. In addition, in comparison to pure NaBH4, whose peak temperature of hydrogen release was 566.8 °C, the peak temperatures of NaBH4 + MCM-22 (1:1) and NaBH4 + SAPO-34 (1:1) decreased to 510.0 and 505.2 °C, respectively. Moreover, the addition of zeolite can improve the hydrogen release kinetics of NaBH4 and when catalyzed by MCM-22 and SAPO-34 can release 2.31 and 3.76 wt. % H2 in 15 h, respectively. Furthermore, SAPO-34 with the larger specific surface area had a better nanoconfinement effect to catalyze hydrogen release of NaBH4 than that of MCM-22.
研究领域:
材料化学
·
能源化学
·
纳米催化
·
储氢材料
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）