ADVANCED MATERIALS
·
2025
·Vol. 37
·期 41
·e03562
·
IF 26.8
Shangqing Qu,Tianhao Niu,Xianji Qiao,Yanran Shen,Guohong Cai,Xiaoge Wang,Yonggang Wang,Zhipeng Zhou,Shipeng Zhang,Zeyue Zhang,Guobao Li,Guanqun Cai,Junliang Sun
Na- β ″-Al 2 O 3 is a highly promising solid-state electrolyte (SSE) for solid-state sodium batteries (SSSBs) with a wide electrochemical stability window and excellent stability against metallic sodium. However, its practical application is hindered by the instability of β ″ phase ( R 3 ¯ $\bar 3$ m ) during sintering, low polycrystalline ionic conductivity at room temperature, and poor interfacial contact with sodium anodes. In this study, a stablized SSSB is obtained via doping Ga 3+ into Na 1.67 Mg 0.67 Al 10.33 O 17 (NMAO), which also suppresses the formation of the β ′ phase ( P 6 3 / mmc ) and decreases stacking faults. After sintering at 1550 °C for 2 h, Na 1.67 Mg 0.67 Al 9.33 GaO 17 (NMA9.33GO) exhibits an ionic conductivity of 9.2 × 10 −4 S cm −1 at 30 °C, ≈1.7 times greater than NMAO. Furthermore, Ga 3+ doping enhances the wettability with sodium, achieving superior contact stability and the formation of Na-Ga alloys at the interface significantly improves electrode-electrolyte contact stability, achieving a high critical current density (CCD) of 0.8 mA cm −2 and a low interfacial impedance of 16 Ω cm 2 . A quasi-solid-state battery assembled with Na 3 V 2 (PO 4 ) 3 (NVP) as the cathode demonstrates excellent cycling stability and rate performance, retaining a high discharge capacity of 91 mAh g −1 at 5 C, and maintaining 87% capacity retention after 1000 cycles at 1 C. This work provides new insights into improving electrolyte performance and interfacial engineering through doping strategies, thereby promoting the development of efficient and long-term SSSBs.
研究领域:
材料科学
·
电化学
·
储能
·
固态电池
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Junjie Zhou,Yike Zhang,Xinyu Wang,Yanan Yang,Xin Wu,Jin Hu,Long Xia
Impedance mismatch and high-temperature oxidation are two main factors that limit the practical application of carbon-based absorbing materials. Although micro/nano-structured composites have been explored to alleviate these issues, they often suffer from dispersion instability and structural fragility. In this work, a coaxial composite fiber microwave absorber (Al 4 C 3 /Al 2 O 3 @C f ) is fabricated using carbon fiber (C f ) as a template and conductive core, with an Al 4 C 3 /Al 2 O 3 ceramic shell grown in situ via a vapor–solid reaction. Compared to pristine C f , which exhibits negligible absorption, the optimized composite achieves a minimum reflection loss of −49.27 dB, attributed to interfacial polarization and a built-in capacitor-like structure. Meanwhile, the material also features excellent oxidation resistance and thermal insulation (0.0567 W m −1 K −1 at 100 °C). This study presents a structurally controllable, thermally robust absorber design that overcomes key limitations of traditional carbon-based materials, offering a promising solution for next-generation electromagnetic protection in aerospace and harsh environments.
研究领域:
材料科学
·
电磁吸收
·
热绝缘
·
陶瓷复合材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2019
·
IF 1.918
Chenghuan Yang,Liang He,Qingqing Guan,Jiajing Chen,Rongrong Miao,Lei Tao,Ningmeng Hu,Bin Li
Enhancement of the transesterification efficiency of triglyceride has come under heated study in biodiesel-making industry. In this research, the NiMo/La-Al2O3 nanopowders have been prepared for producing biodiesel efficiently. The screening test showed that the NiMo/La-Al2O3 catalyst has the best catalytic activity for triglyceride transesterification. Besides, the process parameters including reaction temperature, time, oil-to-alcohol ratio and catalyst loading etc., also have been investigated for optimization of the transesterification process. The results showed that with 5 wt% of catalyst loading, and oil to methanol molar ratio of 1:9, the conversion yield of triglyceride could be up to 95.2% within 120 min at 160°C. The NiMo/La-Al2O3 catalyst has the outstanding recycle property, which proved that the prepared NiMo/La-Al2O3 powders can be suitable for biodiesels’ production.
研究领域:
化学工程
·
催化
·
可再生能源
·
生物柴油生产
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Shuo Tian,Hao Yang Shen,Jun Jie Huang,Hao Zhang,Kai Ge Liu,Bin He,Jianwei Zhao,Ling Bing Kong
When preparing glass-ceramics using sintering method, porosity is the main reason affecting their properties. To achieve glass-ceramics with low thermal expansion performance, cold isostatic pressing is adopted to significantly reduce the porosity. In this study, we systematically analyzed the effect of CaF 2 /CaO content on sintering behavior, microstructure and properties of Li 2 O–Al 2 O 3 –SiO 2 (LAS) glass-ceramics. It was found that the [CaF 2 ]/([CaO]+[CaF 2 ]) ratio x can be used to regulate the coefficient of thermal expansion (CTE) of the LAS glass-ceramics. The optimized sample has a CTE of 2.2865 ppm/°C, which is compatible with that of silicon (2.5 ppm/°C). At the same time, low dielectric constant (5.95 ≤ ε r ≤ 8.89) and dielectric loss (1.179 × 10 −3 ≤ tanδ ≤2.871 × 10 −2 ) were observed, which makes them a promising candidate for low-temperature co-fired ceramic substrate applications.
研究领域:
材料科学
·
陶瓷工程
·
电气工程
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 28
·期 2
·767-777
·
IF 2.817
Zang Guojing,He Min,Liao Youhao,Li Minsui,Hong Mingyao,Li Weishan
To improve the comprehensive performance of fibrous membrane based on poly(methyl vinyl ether-alt-maleic anhydride) P(MVE-MA)- and poly(vinylidene fluoride-co-hexafluoropropylene) P(VdF-HFP)-blended copolymers, a small amount of nano-Al 2 O 3 was doped by electrospinning technique to apply for high-energy-density cathode material of nickel-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) based Li-ion battery. The results indicated that the electrospinning membrane and corresponding gel polymer electrolyte (GPE) only doped with 3.0 wt.% nano-Al 2 O 3 presented the proper structure and delivered the best electrochemical characterization. Due to the uniform distribution of nanoparticles on the fibers with higher density, the specific surface area and porosity of the fiber membrane were increased, leading to the improved fracture stress of 172.0 MPa for the membrane and ionic conductivity of 2.1 × 10 −3 S cm −1 for the GPE at room temperature. Contributed from the proper pore structure and the enhanced interfacial stability, the capacity retention of 89.4% was achieved for the Li/GPE/NCA coin cell after 200 cycles in the voltage range of 3.0 V and 4.3 V under room temperature using the GPE doped with 3 wt.% Al 2 O 3 , compared with that of 63.6% for the GPE without nanoparticles. Similarly, the discharge capacity of the coin cell under 7 C rate (123.2 mAh g −1 ) maintained 65% of that at 0.3 C (189.4 mAh g −1 ), showing good rate performance of the developed GPE. Therefore, the significant improvement in electrochemical stability of the GPE achieved by doping a small number of nanoparticles provided a simple and feasible solution for the development of high-energy-density Li-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Canshuo Gu,Lungang Chen,Yong Liu,Xinghua Zhang,Jianguo Liu,Qi Zhang,Chenguang Wang,Longlong Ma
The production of furanic biofuel 2-methyltetrahydrofuran (2-MTHF) has been studied by hydrodeoxygenation of biomass-derived levulinic acid (LA) over bimetallic NiCo/γ-Al 2 O 3 catalyst. The contents of Ni and Co in NiCo/γ-Al 2 O 3 were investigated. The Ni 5 Co 25 /γ-Al 2 O 3 catalyst gave high activity in hydrodeoxygenation of LA with a 73.4% yield of 2-MTHF under optimal conditions. The crystal phase, valence states, acidity and basicity of catalysts were measured by multiple characterizations to understand the relationships among 2-MTHF yields and catalyst properties. XPS characterization revealed that the number of metal oxides increased on bimetallic catalysts while the reduced metals occupied on monometallic catalysts. The bimetallic catalysts also presented increased acidity than that of monometallic catalysts. These distinct properties were also observed among bimetallic catalysts with different contents of Ni and Co, which were responsible for different performances. Besides, the solvent effect on the structure of 1,4-pentanediol, which was further converted to 2-methyltetrahydrofuran, was disclosed by molecular dynamics simulations.
研究领域:
化学工程
·
催化
·
生物燃料
·
材料科学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Hui Zhu,Yanan Li,Yuexiang Xi,Chunli Xin,Cheng Zhou,Zhe Yang,Lang Ruan,Yanyue Li,Yao Peng,Maxim S. Molokeev,Andrey Zolotov,Jing Wang,Zhi Zhou,Mao Xia
β-Al 2 O 3 phosphors show good optical properties for highly symmetric lattices and dense frameworks. Here, an abnormal lattice shrinkage phenomenon is found in BaMg 1-x Zn x Al 9.8 O 17 : Cr 3+ (BM 1-x Z x A: Cr 3+ ) phosphors, which can be attributed to the variation in the covalency of the chemical bond. Accordingly, the denser crystal structure caused by the abnormal shrinkage improves the luminescent intensity (67%↑) and the thermal stability (69%→76%@150 °C). Internal/external quantum efficiency (IQE/EQE) of BZA: 0.2Cr 3+ reaches 95% and 52.7%, respectively. In addition, the preferential occupation of the Cr 3+ ion is discussed through the crystal field strength calculation, low-temperature spectra, and fluorescent lifetime. The unique spectrum of the phosphor derives from the occupation of Cr 3+ on the octahedral sites (Al4 and Al1) and the formation of Cr 3+ -Cr 3+ coupling pairs. Finally, the high matching rate between the absorption curve of plant pigment P fr and the EL spectrum of the as-prepared pc-LED expresses that it can be applied in plant lighting.
研究领域:
材料科学
·
光学
·
固体化学
·
植物生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14391-14404
·
IF 2.195
Yu Xuemin,Wang Junchuan,Sun Ying,Zhang Xueqin,Lin Baoping
A series of nanocomposite films loaded with various concentrations of fillers were successfully synthesized by solution casting method (BSCTZS nanoparticles (NPs) as filler and polyimide (PI) as polymer matrix). To improve the dispersion and the physical–chemical properties of (Ba 0.87 Sr 0.04 Ca 0.09 )(Ti 0.86 Zr 0.08 Sn 0.06 )O 3 (BSCTZS) NPs surface, BSCTZS NPs were modified by Al 2 O 3 coating and modified Al 2 O 3 @Nb-BSCTZS NPs/PI nanocomposite films were prepared. The prepared modified Al 2 O 3 @Nb-BSCTZS NPs were characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of these composites were characterized in details. As a result, the nanocomposite films filled with 5 vol% Al 2 O 3 @0.4mol%Nb-BSCTZS nanoparticles exhibit an excellent energy density of 2.11 J cm −3 at 298 kV/mm, which is 48% over the original pristine PI (1.42 J cm −3 at 313 kV/mm). This work can provide a prospective solution for the preparation of composite film materials with high dielectric constant and high energy density.
研究领域:
材料科学
·
纳米技术
·
电气工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Han Xu,Gangsong Huang,Wenting Zhou,Xuan Miao,Hongjun Ji,Mingyu Li,Yufeng Li
In the realm of electronic packaging advancements, the utilization of metal to ceramic joints has garnered significant attention. This manuscript details the development of a specific glass solder with excellent wettability and a thermal expansion coefficient of 8.1 × 10 −6 °C −1 , comprising 35Bi 2 O 3 -30B 2 O 3 -15ZnO-20SiO 2 (mol.%). This design achieves reliable connection of the Al 2 O 3 ceramics and Kovar alloy in an atmospheric environment. The interface reaction between the glass solder, Al 2 O 3 ceramics, and oxidized Kovar alloy resulted in the formation of ZnAl 2 O 4 particles and Bi spheres at the joints. The enhancement in joint shear strength was primarily attributed to the nanoscale, dispersed ZnAl 2 O 4 particles. However, the presence of microscale Bi spheres, with a lower elastic modulus than the glass solder, initiated cracks during shear deformation, thereby compromising the integrity of the joint. Optimization of brazing temperatures enabled control over the ZnAl 2 O 4 and Bi sphere phases within the joints, yielding a peak shear strength of 51.7 ± 8.9 MPa at 650 °C. This study highlights the achievement of high-performance metal-ceramic bonding through tailored interface reactions and optimized joint microstructures.
研究领域:
材料科学
·
电子封装
·
连接技术
·
陶瓷-金属连接
·
玻璃焊料
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Shuaixia Hou,Wenlei Xie
Hierarchical porous materials have been considered as promising catalyst carriers due to their large specific surface area and multi-sized pore structure, which can efficiently reduce the mass-transfer resistance of macromolecular reactants as well as improve the exposure of the active sites. In this research, a series of hierarchical porous solid acid catalysts with dual metal oxide active centers, namely Mo/V@H-Al 2 O 3, was prepared by introducing Mo and V into hierarchical porous H-Al 2 O 3 carriers via a successive incipient wetness impregnation approach. The functional species, crystal structures, morphological features, and acidic properties of the synthesized Mo/V@H-Al 2 O 3 catalysts were explored using various characterization techniques. Results showed that this catalyst not only possessed the structural advantages of relatively large surface area and ordered hierarchical porous structure, but also contained dual Brønsted-Lewis acid sites. With the low-cost acidic oils as feedstocks, this catalyst can concurrently catalyze the oil transesterification and free fatty acid (FFA) esterification reaction with the oil conversion rate of 94.3 % and full conversion of FFA under the optimized conditions, achieving one-pot transformation of the acidic oil to biodiesel and thereby simplifying the laborious separation procedure. The synergistic effect between the hierarchical porous structure and the strong acidity was shown to boost the catalytic performance of this Mo/V@H-Al 2 O 3 catalyst for the efficient biodiesel production. The high moisture and FFA-tolerant capacity emerged for this catalyst, and it had good reusability during the biodiesel production process, still with above 80 % of oil conversion even after five cycles of reuse, endowing it to have the great potential for cost-effective and sustainable production of biodiesel in particular with low-cost acidic oils as feedstocks.
研究领域:
化学工程
·
催化材料
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yusheng Qiu,Shuzhuang Sun
The activity and selectivity of catalytic reactions are profoundly influenced by metal–support interactions. The strong metal–support interaction (SMSI) plays a critical role in selectively driving the conversion of CO2 toward CO instead of CH4 in Ni-based catalytic systems. Moreover, the dispersion of active species governs the population of accessible reaction sites, thereby enhancing catalytic activity. In this work, highly efficient SMSI was successfully constructed via steam aging post-treatment over CeO2–Al2O3 nanocrystalline loaded Ni catalysts (NiCeAl). Remarkably, the NiCeAl–H2O catalyst achieves ∼50% CO2 conversion with 90% CO selectivity at 600 °C, representing a dramatic improvement over the untreated NiCeAl catalyst (23% CO2 conversion with ∼92% CO selectivity). Furthermore, the steam-treated catalyst demonstrates superior stability in prolonged CO2 hydrogenation tests, maintaining its performance with only a ∼4% conversion decrease over 10 h of continuous operation. In situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that CO2 chemisorbs on the catalyst surface to form bidentate carbonates, which undergo sequential hydrogenation to form formate intermediates. These formate species subsequently decompose catalytically to produce CO, with the enhanced MSI in NiCeAl–H2O facilitating optimal CO desorption kinetics, thereby promoting superior reverse water–gas shift activity.
研究领域:
催化
·
材料科学
·
化学工程
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Li Zhang,Wanlin Wang,Lei Zhang,Jie Zeng,Xu Gao
The dissolution mechanism of Al 2 O 3 inclusions in molten slags was explored by in-situ single hot thermocouple technique combined with X-ray photoelectron spectroscopy. Result shows that it takes 2940 s to completely dissolve Al 2 O 3 inclusions in the molten F-bearing mold flux, which is mainly controlled by boundary layer diffusion. Because the connected [AlO 6 ] octahedra in the Al 2 O 3 inclusion is gradually destroyed by the O 2− ions in the melt. By comparison, the CaO–SiO 2 –B 2 O 3 based F-free mold flux only takes 840 s to completely dissolve Al 2 O 3 inclusions. Because the [AlO 6 ] octahedra is destroyed and further transformed to [AlO 4 ] tetrahedra and produce O 2− ions, which greatly facilitates the dissociation of the Al 2 O 3 particle. However, the formed [AlO 4 ] tetrahedra will promote the precipitation of the dense 2CaO·SiO 2 ·Al 2 O 3 crystals, which tightly encases the Al 2 O 3 particle and causes significant drop in the dissolution rate. Thus, the dissolution rate is controlled by chemical reaction and then by boundary layer diffusion.
研究领域:
冶金学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）