APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 10
·e7230
·
IF 3.9
Dingning Chen,Haojie Yu,Li Wang,Sergey Z. Vatsadze,Jinyi Liu,Yu Wang
Ferrocene-based compounds are promising burning rate catalysts due to their attractive catalytic activity, flammability, and non-toxic performance. Unfortunately, the high-migration issue of the ferrocene-based catalysts makes it challenging to store composite solid propellants for a long time. Therefore, a dendrimer containing ferrocene units with anti-migration ability was designed herein. The introduction of polar groups provides a large number of interaction sites for anti-migration, and no migration of the dendrimer in the propellant was observed after 4 weeks of the aging test. For catalytic performance, the results showed that the thermal decomposition temperature of ammonium perchlorate could be reduced from 404°C to 369°C by adding 3 wt% ferrocene-based dendrimer. Moreover, compared with the propellant mixed with Catocene, the propellant containing ferrocene-based dendrimer showed a lower pressure exponent (0.47) and a higher burning rate (2.03 mm·s −1 , at 0.1 MPa).
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Journal of Energy Storage
·
2023
·
IF 9.4
Lei Hu,Yongkang An,Li Zhang,Liqiang Mai,Ting Ma,Qinyou An,Qiuwang Wang
Phase change material (PCM) is a suitable candidate for thermal energy storage as its high latent heat and narrow temperature fluctuations during phase change process . However, low thermal conductivity and poor shape stability seriously hinder the large-scale utilization of phase change materials. Here we fabricated the highly oriented N-doped carbon nanotubes (N-CNTs) derived from metal-organic frameworks (MOFs) by a facile and high-yield strategy. Then the N-CNTs/docosane composite PCM (CPCM) was fabricated with the as-synthesized N-CNT as the supporting material and docosane as the functional material. It can be revealed that the shape stability of docosane was significantly enhanced by integrating with N-CNTs. The CPCM possessed a thermal conductivity increased by 197.47 % (0.5286 W·m −1 ·K −1 ) than that of docosane. Besides, the CPCM exhibited an excellent cycle performance with ultrahigh retention of latent heat (99.95 % in melting process and 99.94 % in freezing process) after 20 melting-freezing cycles. Further exploration reveals that the electronic conductivity of the CPCM increases to 2928.26 S·cm −1 . The CPCM was then used to fabricate a flexible thin film for the thermal management of lithium-ion battery (LIB). In the charge-discharge cycle performance test, the maximum temperature of LIB is about 2 °C lower by the utilization of CPCM film. This exploration exhibits great potential in stimulating the development of PCMs and provides a new technology for LIB thermal management .
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JOURNAL OF APPLIED PHYSICS
·
2023
·Vol. 133
·期 23
·
IF 3.2
Shen Jibing,Zhang Min,Lin Shuai,Song Wenhai,Liu Huijun,Liu Qiangchun,Zhu Xuebin,Sun Yuping
The application of microwave absorption materials, which can effectively convert electromagnetic energy into thermal energy and/or other forms of energy, can effectively solve the increasingly serious electromagnetic pollution. As a type of promising microwave absorption material, ternary transition metal carbides/nitrides MAX phases possess layered structure and superior conduction loss capability. However, poor impedance matching and single polarization loss type seriously hinder their improvement of microwave absorption performance. High-entropy engineering is expected to be an effective strategy to address the above problems simultaneously. Herein, a series of low-, medium-, and high-entropy MAX phases with Ti 2 AlC structure were successfully synthesized and their structure, composition, and morphology were comprehensively characterized. High-entropy MAX phase (Ti 1/5 Zr 1/5 V 1/5 Nb 1/5 Ta 1/5 ) 2 AlC presents excellent microwave absorption performance with the optimal minimum reflection loss (RL min ) of −47 dB at 11.92 GHz (a thickness of 2.4 mm) and optimal effective absorption bandwidth of 3.92 GHz between 8.48 and 12.4 GHz (a thickness of 2.78 mm), which are better than those of our prepared low-/medium-entropy MAX phases as well as most of the other previously reported MAX phases. Such excellent microwave absorption performance of (Ti 1/5 Zr 1/5 V 1/5 Nb 1/5 Ta 1/5 ) 2 AlC is attributed to high-entropy engineering, which not only optimizes the impedance matching through regulating permittivity but also introduces more polarization loss type and amount. This work reveals that high-entropy engineering is not only a workable method to enhance the microwave absorption performance in MAX phases, but also an effective strategy to tailor the balance between impedance matching and loss capability through compositional design in single-phase systems.
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高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Zhichao Shang,Xiaoping Cai,Xinyang Jiao,Yan Zheng,Baojing Zhang,Farshid Pahlevani,Peizhong Feng
With the increasing demand for high-temperature gas filtration, porous intermetallic compounds have attracted much attention. In this study, high porosity CoAl with 3D microstructures was prepared using the thermal explosion. The link between the pore structure , mechanical and oxidation resistance of the product was established using 3D-XRM. Moreover, an oxidation corrosion test was conducted in fluid and static air at 700–900 °C for up to 120 h. During the rapid growth stage, the mass gain was dominated by the inward diffusion of O, while during the slow growth stage, it was dominated by the outward diffusion of Al.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Linjing Qiao,Jianqiang Bi,Guandong Liang,Chen Liu,Zhuangzhuang Yin,Yao Yang,Hongyi Wang,Shaoyin Wang,Mengmeng Shang,Weili Wang
Herein, a novel kind of high-entropy MAX phases, (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 AlC 2 powders were successfully synthesized by a newly proposed two-step solid state reaction process. The oxidation experiments demonstrate that the oxidation products of Al 2 Mo 3 O 12 and rutile TiO 2 are formed at about 600 and 800 °C, respectively. Besides, the dielectric and electromagnetic (EM) wave absorption properties of (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 AlC 2 powders and those after oxidation at different temperatures were also examined. The results show that the as-synthesized (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 AlC 2 powders possess excellent EM wave absorption performances with the minimum reflection loss ( RL ) of -45.80 dB (at 1.7 mm thickness) and the maximum effective absorption bandwidth ( E AB ) of 3.6 GHz (at 1.5 mm thickness). After oxidation at 400–800 °C, due to the coupling of conductivity loss and polarization loss, (Mo 0.25 Cr 0.25 Ti 0.25 V 0.25 ) 3 AlC 2 powders can retain good EM wave absorption properties in a certain frequency range. In this paper, the effects of oxidation on EM wave absorption properties of high-entropy MAX phases were systematically investigated for the first time. This work manifests that high-entropy MAX phases are promising EM wave absorbing candidates and can maintain good EM wave absorption performances after oxidation.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zetan Liu,Jingkun Xu,Xiaoqing Xi,Weijia Luo,Ji Zhou
Since the synthesis of non-oxidized ceramic and alloy powders requires both high temperature and oxygen insulation conditions, here we demonstrate a cost-efficient molten salt sealing/shielded synthesis method with dynamic gas tightness. Compared to conventional synthesis method, it can prevent the loss of reaction materials at high temperature, cut off the connection between reacting material and outside air, and does not require long-time ball milling mixing treatment or provision of applied pressing before or during heating. Only low-cost salts (e.g., NaCl, KCl), a few minutes of raw material mixing, and regular heating molds are required to obtain high-purity (>96 wt%), micron-sized Ti 3 AlC 2 and Ti 3 SiC 2 powders with narrow size distribution, which significantly decreased the complexity and production costs in the synthesis process. The effect of temperature and raw material content on the products were investigated. The mechanism of diffusion reaction between reactants in molten salt environment was analyzed. The new method developed here was also applicable to Ti 2 AlC, V 2 AlC and Cr 2 AlC MAX phases, as well as provided new ideas for the preparation of other MXenes precursors with certain stoichiometric ratios, air-sensitive materials and nanopowders .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Luo,Peitong Li,Yi Liu,Xiaoyan Yuan,Xu Jiang,Shouwu Guo
In this study, a series of V 2 (Al 1−x Ga x )C microrods are synthesized for the first time in a molten salt system using short carbon fibers as carbon source and sacrificial template. The phase components, structural characteristics, and microwave absorption performance of as-prepared V 2 (Al 1−x Ga x )C microrods are systematically investigated. The calculated lattice distortion degree results confirm that the phase structure, grain boundary density, and internal stress of V 2 (Al 1−x Ga x )C microrods can be effectively modulated by controlling the doping amount of gallium element. The synergistic effects of dielectric loss, magnetic loss, multiple reflection and scattering afford the V 2 (Al 1−x Ga x )C microrods with enhanced microwave absorption intensity and bandwidth. Specifically, V 2 (Al 0.5 Ga 0.5 )C microrod displays a minimum RL value of − 55.62 dB at 12.00 GHz, and the broadest EAB could reach 4.16 GHz with a thickness of 1.75 mm. Compared with the M sites doped MAX phases, A sites doped V 2 (Al 1−x Ga x )C exhibit more excellent electromagnetic energy attenuation capacities.
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CARBON
·
2022
·
IF 11.307
Junli Ma,Zhenzhen Guo,Xu Han,Kaixin Guo,Haoran Li,Ping Fang,Xianbao Wang,Jianguo Xin
As one of the ways to comprehensively utilize solar energy, solar-driven interfacial evaporation displays promising opportunities to alleviate both freshwater and energy shortages. However, there is always a partial impairment of solar energy utilization during evaporation, and its operation is stagnant without sunlight. In this study, a novel asymmetric evaporator is designed that achieves the maximum utilization of solar energy for clean water and power output by two-step asymmetric filtration of reduced graphene oxide/FeOOH (RGO/FeOOH)-based composites and graphene oxide (GO) on a mixed cellulose ester membrane (MCE). Under one solar irradiation , the RGO/FeOOH-based asymmetric evaporator can achieve an average output power of 51.33 mW m −2 synchronously with efficient solar evaporation. The output voltage can reach up to 640 mV with a current of approximately 84.8 μA. Furthermore, the average output power of this evaporator is 26.96 mW m −2 under ambient conditions. A light-emitting diode (LED) can be successfully lit via a series connection of electricity generators. The RGO/FeOOH-based asymmetric evaporator can function full-time with only solar energy and water, demonstrating the potential to generate steam and electricity simultaneously in sunlight; the findings also show its value as a generator on cloudy days or at night. Moreover, the RGO/FeOOH-based composites also show the photocatalytic degradation capabilities of organic pollutants in water. The simple fabrication strategy and superior thermal and electrical performance of the solution indicate that these novel RGO/FeOOH-based composites can be used for power generation , energy storage and brine and wastewater purification to achieve the maximum utilization of resources.
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Journal of the American Chemical Society
·
2022
·
IF 16.383
Ling Luo,Linan Wang,Jianbang Chen,Jiazheng Zhou,Zhihua Yang,Shilie Pan,Junjie Li
Large second-harmonic generation (SHG) response and broad band gap are two important and competitive parameters. It is difficult to balance them out in one material. In this work, by coupling alkali earth metal (AEM) octahedra with large highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap and nonlinear optical (NLO)-active tetrahedra units, nine noncentrosymmetric (NCS) compounds, belonging to a new quaternary chalcogenide family AIB3IIC3IIIQ8VI with unique windmill-like [Mg3M3IIIQ24] (MIII = Al, Ga; Q = S, Se) units constructed by alternated [MgQ6] octahedra and [MIIIQ4] tetrahedra, are rationally designed and fabricated. The compounds show a stable structural framework but adjustable optical properties. Among them, NaMg3Ga3Se8 shows a large SHG response (∼1 × AgGaS2 (AGS)), wide band gap (in selenide) (2.77 eV), high laser-induced damage threshold (LIDT) (∼2.3 × AGS), and suitable birefringence (0.079@546 nm). It should be a potential candidate for infrared (IR) nonlinear optical (NLO) materials. The results enrich the chemical diversity of chalcogenides and open an avenue for the development of new IR NLO materials through the octahedra and tetrahedra coupled strategy.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Sihao Wang,Tingyu Wang,Xianglong Kong,Xudong Zhao,Hongyu Gan,Xiangxi Wang,Qingjie Meng,Fei He,Piaoping Yang,Zhiliang Liu
Aluminum sulfide is a novel light metal sulfide , which possesses multiple advantages for lithium storage, including high theoretical capacity, proper discharge potential and good conductivity. However, much research has not been done in areas related to light metal sulfide materials. Herein, we synthesized Al 2 S 3 /C nanocomposite by a facile one-step ball milling method. This simple method not only effectively achieves the uniform composite of Al 2 S 3 nanoparticles and carbon sheets, but also controls Al 2 S 3 into ultrafine nanocrystals . Al 2 S 3 /C electrode demonstrates very outstanding lithium storage performance with large reversible specific capacity (1249 mAh g -1 at 100 mA g −1 ), remarkable rate capability (670 mAh g -1 at 5000 mA g −1 ) and superior long-cycling stability (retaining 850 mAh g -1 even after 1000 cycles at 1000 mA g −1 ). Moreover, the reversible lithium storage behavior and excellent diffusion kinetics of Al 2 S 3 /C are unveiled deeply. This work provides an inspiration to develop new light metal sulfide materials for the next-generation high-performance lithium ion battery .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Mingyuan Zhang,Taotao Cai,Weiliang Lu,Shili Zheng,Ying Zhang,Yi Zhang
Given the high cost of fabricating the Ti-6Al-4V alloy powder by the traditional hydriding-dehydriding and atomization methods, a novel sintering-deoxygenation process was proposed and studied in this research. With the help of the developed deoxygenation treatment, value-added raw materials such as Ti sponge can be substituted by low-cost and low-grade materials with high oxygen content. In addition, sintering in a solid state saves a significant amount of processing energy compared to alloying above the melting point of Ti in the conventional alloy production process. This paper prepared six sintering precursors with different initial compositions and oxygen contents using the low-valued raw materials of crude titanium, crude vanadium, V 2 O 3 , Al powder, and Al 2 O 3 powder. These precursors' sintering performances on shrinkage, phase composition, microstructure, and porosity were investigated. The results show that the sintering shrinkage is positively correlated with the sintering temperature and holding time and is also affected by the raw materials. The pellet made by mixed crude titanium and AlV master alloy showed the largest shrinkage and the densest bulk. The various combinations of the raw materials led to the changes in the oxygen contents in the precursors, the alpha-beta phase ratio, and the shift of the diffraction peaks of the α-phase. The dissolving of the AlV master alloy and the formation of the Ti 3 Al intermediate phase took place during sintering due to diffusion. Sintering at 900–1000 °C is critical for elemental diffusion and densification, and sintering at higher temperatures is decisive for microstructure homogenization and further densification. Using the hydrogen-assisted Mg deoxygenation method, all the sintered samples could be treated to an oxygen level of around 0.4 wt% regardless of oxygen content in precursors. The contents of Ti, Al, V, and Fe in the obtained Ti-6Al-4V powders met the requirements of GB/T 34486-2017. This research has demonstrated the feasibility of fabricating Ti-6Al-4V alloy powder by the novel sintering-deoxygenation process.
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Small
·
2022
·Vol. 18
·期 50
·2204875
·
IF 15.153
Zhenbang Li,Fei Tian,Yan Li,Danni Lei,Chengxin Wang
The insertion type materials are the most important anode materials for lithium-ion batteries, but their insufficient capacity is the bottleneck of practical application. Here, LiAl 5 O 8 nanowires with high theoretical capacity and Li-ions diffusion coefficient are prepared and studied as an insertion anode material, which exhibits zero-strain properties upon electrochemical cycling. However, the poor electronic conductivity of LiAl 5 O 8 definitely sacrifices the capacity and limits the rate performance. Therefore, compact LiAl 5 O 8 and carbon composite are further synthesized, in which nanosized LiAl 5 O 8 particles are uniformly embedded in an amorphous carbon matrix. It displays a reversible capacity of 490.9 mAh g −1 at 1 A g −1 , and the capacity rises continuously to 996.8 mAh g −1 after 1000 cycles due to the interfacial storage mechanism, that the excess Li + ions can be accommodated in the grain boundaries and C/LiAl 5 O 8 interfaces.
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高影响因子
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