COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Limeng Song,Yongqiang Chen,Qiancheng Gao,Zhe Li,Xinyue Zhang,Hailong Wang,Li Guan,Zhaoju Yu,Rui Zhang,Bingbing Fan
With the rapid development of modern information technology, high-level electromagnetic wave (EMW) absorbing materials are playing an increasingly important role in military and civilian fields. However, current EMW absorbers usually have narrow absorption bandwidths and low absorption strengths , which hinder their practical applications. Herein, lightweight aerogels with low thermal conductivity and highly efficient EMW absorption were fabricated via a sol–gel method and subsequent carbothermal reduction with a simple chemical reaction process. The as-prepared graphene/SiC-nanosheets aerogels are composed of a large number of the interconnected two-dimensional SiC nanosheets and graphene sheets with abundant micrometer-sized pores that favored impedance matching, which endows the aerogels with outstanding EMW-absorbing performance. Conductive loss and interfacial polarization further promote the EMW-absorbing of the graphene/SiC-nanosheets aerogels. In addition, the highly porous and interconnected three-dimensional graphene/SiC-nanosheets aerogel networks not only facilitate the absorption of infiltrated EM waves via multiple reflection but also effectively reduce the number of heat transmission routes in the aerogels. The as-prepared SiC/G-2 aerogel exhibites excellent EMW-absorbing property, with a RL min of −65.08 dB at a frequency of 13.20 GHz, a thickness of 3.5 mm and an EAB of 2.21 GHz. These results demonstrate that the as-prepared graphene/SiC-nanosheets aerogel is fascinating material with possible applications in high-performance EMW-absorbing and heat-insulating in the aviation and aerospace fields.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Limeng Song,Bingbing Fan,Yongqiang Chen,Hailong Wang,Hongxia Li,Rui Zhang
Multifunctional high-level performance electromagnetic wave (EMW) absorbing materials is receiving increasing attention with the rapid development of modern information technology. However, current EMW absorbing materials usually have single function and poor thermal and chemical stability, which seriously hinders the practical application of these materials. Herein, to broaden the application fields of the EMW absorption materials, a multifunctional SiC nanofiber aerogel (SiC NFA) was prepared by using chemical vapor deposition (CVD) technology in this work. The as-synthesized SiC NFA exhibits a quite low density (∼9 mg cm −3 ), excellent mechanical performance, high fatigue-resistant, satisfactory refractory property, high temperature thermal stability and good thermal insulation performance. Moreover, the oil-modified SiC NFA has a dramatic hydrophobicity , resulting in a good self-cleaning performance. This SiC NFA also achieves a superior EMW-absorbing property with a minimum refection loss (RL min ) value of −39.37 dB at 7.04 GHz when its thickness is 1.9 mm. These inspiring findings lay a foundation for the subsequent development of multifunctional EMW absorbents.
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 5
·e12429
·
IF 13.443
Yuzhu Yao,Xiaolei Qu,Linming Zhou,Yongfeng Liu,Zijian Hong,Yongjun Wu,Zhenguo Huang,Jianjiang Hu,Mingxia Gao,Hongge Pan
The development of high-performance binders is a simple but effective approach to address the rapid capacity decay of high-capacity anodes caused by large volume change upon lithiation/delithiation. Herein, we demonstrate a unique organic/inorganic hybrid binder system that enables an efficient in situ crosslinking of aqueous binders (e.g., sodium alginate (SA) and carboxymethyl cellulose (CMC)) by reacting with an inorganic crosslinker (sodium metaborate hydrate (SMH)) upon vacuum drying. The resultant 3D interconnected networks endow the binders with strong adhesion and outstanding self-healing capability, which effectively improve the electrode integrity by preventing fracturing and exfoliation during cycling and facilitate Li + ion transfer. SiO anodes fabricated from the commercial microsized powders with the SA/0.2SMH binder maintain 1470 mAh g −1 of specific capacity at 100 mA g −1 after 200 cycles, which is 5 times higher than that fabricated with SA binder alone (293 mAh g −1 ). Nearly, no capacity loss was observed over 500 cycles when limiting discharge capacity at 1500 mAh g −1 . The new binders also dramatically improved the performance of Fe 2 O 3 , Fe 3 O 4 , NiO, and Si electrodes, indicating the excellent applicability. This finding represents a novel strategy in developing high-performance aqueous binders and improves the prospect of using high-capacity anode materials in Li-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiuhong Ma,Huizhong Zhao,Jun Yu,Han Zhang,Yichong Li,Lida Shi,Yi Zhao,Jian He
In this study, four types of commercial tabular corundum were selected as aggregates, and four Al 2 O 3 –SiC–C castables were prepared under same conditions. The microstructure characteristics of the aggregates were observed. The thermal shock resistance and slag resistance mechanism were evaluated. Dendritic pores were proven to be beneficial for relieving and guiding thermal stress. According to the Lobe method, the dendritic pores provided the aggregates with a higher thermal conductivity and better thermal stability than the circular pores. The role of the aggregate microstructure in resisting slag erosion was discussed through thermodynamic and kinetic analyses. The presence of dendritic pores and a small neck size led to a faster dissolution rate during the slag erosion process. At the same time, the dissolution rate and dissolution amount increased, resulting in the faster supersaturation of the slag. Based on Ostwald's supersaturation theory, a thicker spinel isolation layer would be precipitated on the inner walls of the slag erosion path, thereby preventing the further erosion of the slag.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 5
·2256-2265
·
IF 2.047
Chen Shaoping,Chen Jie,Fan Wenhao,Wang Yaning,Guo Jingyun,Wang Yachao,Jiang Yu,Al-Yusufi Rasha Abdullah Ahmed,Ferhat Marhoun
Mg 2 SiNi 3, is a topologically densely packed intermetallic compound (TCP-IMC) and an excellent diffusion barrier material between nickel and Mg 2 Si-based thermoelectric material. However, even a little migration of the Mg atom from Mg 2 Si to Mg 2 SiNi 3 under the action of a driven force promotes the formation of an Mg deficiency region on the Mg 2 Si side, which destroys the balance of point defects and leads to performance deterioration. In this work, by adjusting the chemical potential of Mg across the Mg x Si 15 Ni 50 /Mg 2 Si ( x = 36, 50, 130) interface, the migration of Mg in thermoelectric material has been suppressed effectively. The results indicate that the contact performance and service stability of the Mg 130 Si 15 Ni 50 /Mg 2 Si interface has been improved by 50% compared to that of Mg 36 Si 15 Ni 50 /Mg 2 Si, which remains quite well after annealing at 400 ℃ for 480 h. TCP-IMC barrier with proper composition is a promising design for the manufacture of TEG interface to ensure its consistency in service especially under a large temperature difference.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Honghui Xiong,Jinglei Liu,Yongjun Zhang,Hao Wang,Enhao Sun
To reduce the coke formation, a novel Al/Si/Cr/Ce composite ceramic coating was prepared on the surface of the Cr 25 Ni 35 Nb alloy substrate by pack cementation. The microstructure, phase composition, surface morphology and element distribution of substrate and coating were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results reveal that the outer layer of the coating forms a protective layer with a high proportion of AlN and Cr 3 Si and trace amounts of Ce. The inter-diffusion layer is mainly aluminide coating (AlNi and AlFe) and transition layer contains a small amount of AlN. The anti-coking performance of the coating was assessed using naphtha steam cracking. To study coking behavior, the morphology and microstructure of the coke layer were analyzed and characterized by SEM and Laser Micro-Raman Spectrometer. The coke layer on uncoated sample has a higher focal density and is more likely to spall and peel off when subjected to coking experiment. A large number of filamentous and granular cokes appear on the surface of the uncoated sample, whereas only less granular cokes appear on the surface of the coated sample, and the coke on the uncoated sample has a more disordered and amorphous carbon structure. The coating significantly inhibited the growth of filamentous coke and reduced coke accumulation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Pengfei Wu,Zian Jia,Chao Liu,Changqing Guo,Binbin Xu,Anhua Liu,Ling Li
Silicon/carbon (Si/C) composites have emerged as promising anode materials for next-generation lithium-ion batteries (LIBs) due to their high power and energy density, but managing the stress resulting from the large volume change of Si during charging and discharging remains a major challenge. To address this issue, we present a novel microsized porous Si/C-based anode design (AC_Si/C) that incorporates Si@C core–shell nanoparticles and hollow carbon nanospheres as deformable cushions fabricated using a scalable microemulsion approach. Our hybrid anode material system offers high ion and electron conductivity and efficient stress mitigation via the deformable hollow carbon nanospheres, resulting in improved cycling and rate performance. Finite element simulations reveal the stress mitigation mechanisms of the hollow carbon nanospheres, and the AC_Si/C nanostructure exhibits a high reversible specific capacity (855.3 mA h g–1 at 2 A g–1 over 500 cycles) and good capacity reservation for rate performance tests under various current densities. The microemulsion-based synthesis method enables large-scale production of porous Si/C nanocomposites as high-performance commercial anode material systems, demonstrating the potential of this air cushion-inspired design for the development of next-generation high-performance LIBs.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Zhiyue Zhao,Zhiwei Jiang,Yizhe Huang,Mebrouka Boubeche,Valentina G. Matveeva,Hector F. Garces,Huixia Luo,Kai Yan
The rational design and green synthesis of low-cost, robust, and efficient catalysts for the selective oxidation of various alcohols are highly challenging. Herein, we report a fast and solvent-free arc-melting (AM) method to controllably synthesize a semimetallic CoSi alloy catalyst (denoted as AM-CoSi) that is efficient in the base- and solvent-free oxidation of six types of aromatic alcohols. X-ray absorption fine structure analysis, electron paramagnetic resonance spectroscopy, and aberration-corrected high angle annular dark field scanning transmission electron microscopy confirmed the successful synthesis of AM-CoSi with abundant Si vacancies (Si v ). The as-prepared CoSi alloy catalysts exhibit an order of magnitude greater activity in the oxidation of a model reactant, benzyl alcohol (BAL) to benzyl benzoate (BBE), compared with their mono-counterparts, and provide 70% yield of BBE, the highest yield reported to date. Experimental results and density functional theory calculations suggest that the CoSi alloy structure improves the BAL conversion and that Si vacancy is the main contributor to the generation of BBE, based on which a potential reaction pathway is rationally proposed. Furthermore, the CoSi alloy maintains high stability and also exhibits high activity in the selective oxidation of various alcohols with different functional groups. This work demonstrates for the first time that semimetallic CoSi alloys can be robust catalysts for the green oxidation of various alcohols and proviedes a vast opportunity for the rational design and application of other semimetal alloy catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiazheng Zhou,Ling Luo,Yu Chu,Peng Wang,Zhiyong Guo,Xin Su,Junjie Li
The Pb x Sn 2−x SiS 4 series from 0 ≤ x ≤ 2 were investigated to study the influence of partial congener cationic substitution on structure and properties. While the centrosymmetric (CS) compounds Pb 2 SiS 4 and Sn 2 SiS 4 crystallizing in the centrosymmetric (CS) P 2 1 / c space group have been reported previously, the partial congener cationic substitution induced CS to noncentrosymmetric (NCS) structural transformation in this system and the formed NCS substitution variant PbSnSiS 4 are introduced here for the first time. PbSnSiS 4 crystallizes in P 2 1 space group with the cell parameters a = 6.4334(8) Å; b = 6.6912(8) Å, c = 8.5037(10) Å, β = 108.576(4) °, Z = 2. The title compound shows a strong second harmonic generation (SHG) response (~ 1.1 × AgGaS 2 ), high laser induced damage threshold (LIDT) (~3 × AgGaS 2 ), and wide IR transparent region from 0.58 to 16.85 µm (down to zero). What’s more, PbSnSiS 4 exhibits good crystal growth habits, and millimeter-scale single crystals (~ 2 × 2 × 1 mm 3 ) were obtained in a spontaneous crystallization way. The theoretical calculations indicate that the optical band gaps decrease with increasing Sn content from Pb 2 SiS 4 (1.94 eV), PbSnSiS 4 (1.82 eV), to Sn 2 SiS 4 (1.69 eV). The results give an insight into the exploration of new NCS compounds with the congener cationic substitution strategy.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2021
·
IF 4.342
Wennan Su,Xiufang Cui,Guo Jin,Yajie Guan,Yao Zhao,Simin Wan,Changhao Liu,Yuyun Yang,Haoliang Tian
NiTi, NiTi-4Si, and NiTi-4Si-2YF 3 coatings were prepared on Ti-6Al-4V substrate by laser cladding to obtain composite multilayer protective coating for composite structure. The effects of Si and YF 3 addition on the microstructure, phase composition, microhardness , and phase transformation of the coatings were systematically analyzed. The coatings are mainly composed of NiTi, NiTi 2, and TiN phases. The addition of YF 3 results in the decrease of the dendrite TiN phase in the coating. TEM results show that the core-shell structure is observed in NiTi-4Si coating. The β -Ti phase was surrounded by the shell NiTi 2 phase. After the addition of YF 3 , the core-shell structure was found to disappear. With the addition of the Si element, the eutectic structure was found in the coatings. The eutectic structure is mainly composed of NiTi (B2) and Ti 2 Si phases. According to the SEAD result, there are crystallographic orientation relationships (ORs) between NiTi (B2) phase and Ti 2 Si phase as follows: 1 ¯ 11 B 2 / / 1 ¯ 23 Ti 2 Si . The average microhardness of the NiTi, NiTi-4Si and NiTi-4Si-2YF 3 coatings were at 468.33 HV 0.5 , 499.86 HV 0.5 , and 433.65 HV 0.5 , respectively. At the same time, the uniformity of the NiTi phase in NiTi-4Si-2YF 3 coatings is improved, which is conducive to a more complete phase transition.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 13
·2107897
·
IF 18.808
Zhiwei Yang,Chen Wu,Shi Li,Lang Qiu,Zuguang Yang,Yanjun Zhong,Benhe Zhong,Yang Song,Gongke Wang,Yuxia Liu,Zhenguo Wu,Xiaodong Guo
Stress failure and continued growth of the solid electrolyte interface are the main factors contributing to the failure of lithium-ion batteries with silicon (Si) anode. Conventional porous structures typically result in a reduction in the strength and tap density of Si materials. Due to the high melting point and chemical stability of Si, there are limited methods to prepare its porous structure. Here, a method for preparing core–shell gradient porous Si with a high-strength core and a high-porosity shell is presented. The high-strength core can withstand enormous volume change stress. The rich porous structure of the shell ensures the stable existence of SEI. The Si anode material with a core–shell gradient porous structure delivers a discharge capacity of 2127 mAh g −1 (1488 mAh cm −3 ) after 100 cycles at 1 A g −1 , cycling stability with more than 1059 mAh g −1 even after 500 cycles at 2 A g −1 , and a rate capability of 1916 mAh g −1 at 4 A g −1 . These results suggest that the core–shell gradient porous structure provides a new research strategy to address the stress rupture and continuous SEI growth in Si-based anode materials during charge/discharge.
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 14
·期 1
·14
·
IF 2.7
Yufei Zu,Zi Wang,Hongliang Tian,Fan Wu,Lianshen Fu,Jixiang Dai,Jianjun Sha
High-entropy diboride-based (MeB2-based) ceramics are promising high-temperature structural materials because of their excellent mechanical properties, high-temperature stability, and oxidation resistance. In order to achieve low-temperature sintering of the high-entropy ceramics, a novel preparation method of high-entropy (Ti,Zr,Nb,Mo,W)B2-SiC ceramics based on reactive sintering of pre-alloyed solid-solution metals and nonmetals of Si, C, B4C was conducted in the current work. Mechanical alloying behavior of the mixed metal powders, as well as the phase composition, microstructure, mechanical properties, and oxidation behavior of the as-sintered MeB2-SiC ceramic were investigated. The XRD, SEM, and EPMA results indicated that the primary MeB2solid-solution and SiC phases could be successfully formed during reactive sintering at a relatively low temperature of 1650 °C. The as-sintered MeB2-SiC ceramics had a high relative density of 97.8% and high mechanical properties (hardness of 19.74 ± 0.8 GPa, flexure strength of 533 ± 38 MPa, and fracture toughness of 6.01 ± 0.77 MPa·m1/2). Combining the oxidation behavior and microstructure evolution of the oxidation layer, a continuous and relatively dense MeOx-SiO2oxidation layer was gradually formed and covered on the external surface, leading to decelerating oxidation behavior after an oxidation exposure time of 10 min.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）