ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 10
·2200125
·
IF 4.122
Xudong Yang,Mingrui Xie,Weiting Li,Junwei Sha,Naiqin Zhao
Silicon (Si) has a significant influence on the cellular structure and microstructure of the aluminum (Al) foams, which in turn will notably affect their mechanical responses. Herein, the Al–Si foams are fabricated via a novel powder metallurgy foaming approaches with multiple Si contents to investigate the role of Si concentrations on the structural and mechanical properties. The results show that the certain contents of Si can not only delay the expansion process, but also increase the maximum expansion rate to improve the cellular structure. Specifically, the AlSi7 foams process the optimal comprehensive compressive properties of yield stress (4.36 MPa), plateau stress (6.02 MPa), and energy absorption capacity (3.47 MJ m −3 ) with the relative density of 0.15. However, excessive Si can decrease the expansion rate and deteriorate the cellular structure. Moreover, the deformation mode of the Al foams during compressive process converts from plastic mode to brittle mode by the adding of Si. Generally, the AlSi7 foams possess an excellent trade-off between toughness and brittleness and exhibit the optimal mechanical responses.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
ZhiLong Han,Han Zhang,Qiang Wu,ShuPing Li,Wei Zhong,RenJie He,ShiJie Cheng,Jia Xie
Silicon-sulfur (Si-S) full cells show significant potential in energy storage due to their high theoretical energy density compared to commercial lithium-ion batteries. Nevertheless, a majority of electrolytes reported for Si-S full cells still cannot meet the requirements of stable long-duration cycling. Herein, we report a high-areal-capacity Si-S full cell consisted with prelithiated SiO, thick Li 2 S-Se 0.05 S 0.95 @pPAN electrode and a trifluorobenzene (F 3 B) modified and diluted high-concentration electrolytes. This novel electrolyte can effectively mitigate the volume expansion of the prelithiated SiO anode and enhance the utilization of active S in the cathode, showing excellent compatibility with electrodes. The assembled Si-S full cell using modified electrolyte displays remarkable cyclability over 100 cycles at 0.1C, exhibiting higher capacity retention (54.0% vs . 17.5%) than the pristine electrolyte without F 3 B. More importantly, a full cell with a thick sulfur cathode (16 mg/cm 2 ) exhibits a superior initial areal capacity of 8.34 mAh/cm 2 and high-capacity retention of 52% after 80 cycles, even at a lean electrolyte condition (2 μL/mg). This work provides guidance for the achievement of high-performance Si-S full cells under lean electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
Foods
·
2026
·Vol. 15
·期 10
·1738
·
IF 6
Yu Wang,Chengming Wang,Guowei Ling,Mingshuang Xia,Yuhan Yi,Shilin Liu,Wenlin Li
Traditional activated clay (AC) bleaching usually shows limited adsorption selectivity, leading to micronutrient loss during pigment removal, and also suffers from high residual oil retention and poor regenerability. Developing mild bleaching materials with both high adsorption efficiency and selectivity is therefore important for oil refining. Mesoporous Al-MCM-41 (AM) adsorbents with different Si/Al ratios were prepared and characterized in pore structure and acidity, and the bleaching performance against AC in terms of pigment removal and the retention of micronutrients in rapeseed oil and the bleaching mechanism were studied. The results showed that AM25 (Si/Al = 25) exhibited the best overall performance among the AM samples under the tested conditions (70 °C, 20 min). It achieved a bleaching efficiency of 92.3% and removed 94.56% of chlorophyll, 92.94% of lutein, and 84.09% of β-carotene. In addition, AM25 reduced the peroxide value from 2.52 to 0.58 mmol/kg. High retentions of tocopherols (93.89%), phytosterols (98.73%), and squalene (96.32%) were also observed. Meanwhile, the adsorption rates of α-tocopherol, brassicasterol, and α-linolenic acid showed the highest values in their relative homologues of tocopherols, phytosterols, and free fatty acids (FFAs), respectively, due to differences in the methyl amount of tocopherols, the side-chain unsaturation of phytosterols, and the fatty acid chain unsaturation of fatty acids. Furthermore, the kinetic and isotherm data for chlorophyll and carotenoids were better described by the pseudo-second-order and Freundlich models, respectively. Combined with thermodynamic analysis, they indicated that adsorption was a spontaneous, endothermic, entropy-driven, heterogeneous multilayer process dominated by physical adsorption. Further, pigment adsorption was mainly governed by uniform mesopores and Si–OH/Si–OH–Al sites in AM. Among them, carotenoid removal depended primarily on the dispersion effect of moderately strong acid sites within pore-confined regions, whereas chlorophyll removal was more sensitive to the number of acidic sites in AM. AM25 still maintained 83.31% bleaching efficiency after five regeneration cycles. These performances of AM25 are significantly superior to that of AC.
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DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 35
·18391-18396
·
IF 3.708
Dongsheng Tan,Bin Liu,Di Chen,Guozhen Shen
To fulfil the increasing demands for high-efficiency next-generation energy storage systems, different electrode matrixes have been designed to achieve the desired batteries with high energy density and long cycle life. Herein, we fabricated novel binder-free Si@SiO2 nanowires/carbon textiles cable-type anodes for Li-ion batteries applications. The half-cells based on the above electrodes delivered high reversible capacity of 2247 mA h g−1 at 800 mA g−1, good rate capability, and excellent cycle stability of as long as 1000 cycles at 8 A g−1. Full batteries including the as-synthesized Si@SiO2 anodes and commercial LiCoO2 cathodes were also fabricated, which exhibited greatly enhanced performance, thus revealing that these novel Si@SiO2 nanowires/carbon textiles cable-type electrodes can be applied in next-generation energy storage devices.
研究领域:
材料科学
·
能量存储
·
电化学
·
纳米技术
·
电池技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ye Li,Yong Wang,Honghao Bai,Shishuai Li,Xiaomin Li,Xiaoqing Wang,Libo Li,Jinping Li,Jiangfeng Yang
The economically efficient separation of ethane (C 2 H 6 )/ethylene (C 2 H 4 ) presents challenges in the petrochemical industry, and the use of traditional adsorbents zeolite provides a reliable guarantee for maintaining the economic viability of adsorption separation technology. In this study, we investigate the impact of different silica-alumina ratios (SiO 2 /Al 2 O 3 = 40, 500, and 1500) of high silica zeolites ZSM-11 on the C 2 H 6 /C 2 H 4 separation performance to develop efficient C 2 H 6 selective adsorbents. The results show that the C 2 H 6 adsorption capacity and C 2 H 6 /C 2 H 4 selectivity of ZSM-11 increase as the silica-alumina ratios increases. The pure silica zeolite (ZSM-11(1500)) exhibits the highest adsorption capacity for C 2 H 6 (59.19 cm 3 /g) and the highest selectivity for C 2 H 6 /C 2 H 4 (2.04), which were superior to ultra-high silica sample (ZSM-11(500)) (55.06 cm 3 /g and 1.62, respectively) and high silica sample (ZSM-11(40)) (47.28 cm 3 /g and 1.23, respectively), at 273 K and 1 bar. The mixed gas breakthrough experiments results show that pure silica sample has outstanding C 2 H 6 /C 2 H 4 separation ability. The PSA simulation calculated data demonstrating promising potential for industrial applications. Importantly, this separation performance remains unaffected even in the presence of H 2 O.
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiaying Zhu,Yanyang Wu,Bin Wu,Kui Chen,Lijun Ji
m-Cresol and p-cresol are widely used in medicine and pesticides as important chemical intermediates. They are generally produced as a mixture in industry and are difficult to separate due to the similarities in both chemical structures and physical properties. The adsorption behaviours of m-cresol and p-cresol on zeolites (NaZSM-5 and HZSM-5) with different Si/Al ratios have been compared by static experiments. Selectivity on NaZSM-5(Si/Al = 80) could be greater than 6.0. Adsorption kinetics and isotherms were investigated in detail. The kinetic data was correlated by PFO, PSO, and ID models, the NRMSE of which were 14.03%, 9.41%, and 21.11%, respectively. In the meanwhile, according to the NRMSE of Langmuir (6.01%), Freundlich (57.80%), D-R (1.1%), and Temkin (0.56%) isotherms, adsorption on NaZSM-5(Si/Al = 80) was mainly a monolayer and chemical adsorption process. It was endothermic for m-cresol and exothermic for p-cresol. The Gibbs free energy, entropy, and enthalpy were calculated accordingly. The adsorption of cresol isomers on NaZSM-5(Si/Al = 80) were both spontaneous, and it was exothermic (ΔH = −37.11kJ/mol) for p-cresol while endothermic (ΔH = 52.30kJ/mol) for m-cresol. Additionally, ΔS were respectively −0.05 and 0.20 kJ·mol−1·K−1for p-cresol and m-cresol, which were both close to zero. The adsorption was mainly driven by enthalpy. The result of breakthrough further demonstrated m-cresol and p-cresol could be separated effectively by NaZSM-5(Si/Al = 80). Additionally, the selectivity increased from 7.53 to 14.72 after four cycles regeneration with 9.95% and 53.96% decreases in the adsorption amounts for m-cresol and p-cresol, respectively. In conclusion, NaZSM-5(Si/Al = 80) could be a feasible adsorbent for the separation of m-cresol and p-cresol.
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Xiangping Dai,Guoqiang Luo
Tungsten (W)-based composites with 1 wt% SiC were consolidated via field assisted sintering (FAST). FAST was conducted at temperatures ranging from 1000 °C to 1700 °C with holding times of 1–10 min under a pressure of 50 MPa. The densification and grain growth mechanisms were investigated using a creep deformation model and the grain growth power law. Various densification and grain growth mechanisms corresponded to different effective stress exponents ( n ) and grain growth exponents ( p ). n is the stress exponent associated with the densification mechanism, and p is the grain growth exponent related to the grain growth mechanism. The densification process mainly occurred at 1000 °C–1400 °C, whereas grain growth mainly occurred at 1500 °C–1700 °C. The W-Si-C composites were densified primarily through particle rearrangement (when n is ∼1), intergranular diffusion (when n is ∼2), and the dislocation-climb mechanism (when n is 3.62). The activation energies were estimated to be 153.80 and 541.17 kJ/mol at the effective stress exponents ( n ) of 1 and 2, respectively. Furthermore, intergranular diffusion is speculated to cause grain growth. The sintering temperature considerably affected the microstructure of W-Si-C composites. The silicide formed at sintering temperatures of <1100 °C was WSi 2 , and it transformed into W 5 Si 3 with increasing sintering temperature.
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaohan Li,Ke Xu,Yingjie Yu,Chi Chen,Haijun Zhang,Wen Lei
Silicon (Si) is a highly promising anode candidate for lithium-ion batteries. However, the huge volume change of Si during the lithiation/delithiation process might cause serious structural damage, thereby restricting its potential application. Herein, a novel self-standing electrode consisting of porous carbon coated Si (Si@p-C) nanoparticles and carbon fibers (Si@p-C/p-CF) is prepared by a facile electrospinning technique. The three-dimensional carbon fiber framework derived from polyacrylonitrile serves as the support for self-standing electrode, which exhibits superior flexibility and satisfactory electrolyte penetration ability. The porous carbon matrix on the surface of Si nanoparticles can effectively buffer the volume expansion of Si during cycling and prevent direct contact between Si and the electrolyte. Attributed to these merits, the obtained (Si@p-C) 0.5 /p-CF electrode exhibits outstanding cycling stability with a specific capacity of 940 mAh g −1 at 0.2 A g −1 after 400 cycles, delivering great application potential.
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产品关联
DOI
高影响因子
Metals
·
2023
·Vol. 13
·期 5
·937
·
IF 2.9
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Ronghan Wei,Guoqiang Luo
W-Si-C composites with high relative densities and good mechanical and wear properties were successfully prepared by spark plasma sintering. The influence of SiC content on the relative density, microstructure, mechanical properties and wear characteristics was investigated. The results indicated that the reaction between SiC and W at their interface produced W2C and W5Si3. SiC also reacted with oxygen impurities at the W grain boundary to form SiO2. The purification of the grain boundaries of W was carried out by SiO2synthesis. Reactive sintering reduces the free energy of the system and facilitates the densification process of W-Si-C composites. This results in a significant increase in the relative density of W-Si-C composites, which reaches a maximum of 98.12%, higher than the 94.32% of pure tungsten. The hardness significantly increases from 4.33 GPa to 8.40 GPa when the SiC content is 2 wt% compared to pure tungsten due to the generation of the hard ceramic phase and the increase in relative density. The wear resistance of the W-Si-C composites was significantly improved with little SiC addition. The wear rate significantly decreased from 313.27 × 10−3mm3/N·m of pure tungsten to 5.71 × 10−3mm3/N·m of W-0.5 wt% SiC. SEM analyses revealed that the dominant wear mechanism of pure tungsten was attributed to fatigue wear, while that of W-Si-C composites was due to abrasive wear.Keywords:W-Si-C composites;spark plasma sintering;interface reaction;mechanical properties;wear characteristics
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DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 13
·2201830
·
IF 6.8
Junkai Zhao,Wenhao Li,Mingzhu Xie,Kaimeng Yang,Daina Wei,Zhengjian Chen,Ce Zhang,Zhaolong Wang,Xiaojing Yang
Silicon (Si) is becoming one of the most promising candidates for lithium-ion batteries (LIBs) owing to its high theoretical capacity, ultralow lithiation/delithiation voltage, non-flammability, abundant natural reserves, etc. However, Si particles undergo violent volume expansion/contraction during the charge/discharge cycles, resulting in a series of serious problems such as Si particle pulverization, solid electrolyte interphase film overgrowth, and electrode structure collapse, which severely hinders the application of silicon-based LIBs. Herein, a composite binder crosslinked by polyacrylic acid and p -toluene sulfonic acid protonated polyaniline is proposed to improve the electrochemical performance of Si-based anodes. The cross-linked composite binder processes 3D networks, fast self-healing features, and excellent mechanical strength, which can alleviate the damage caused by the expansion of Si particles to the electrodes and protect the structural integrity of the Si-based electrodes. As a result, the Si-based anodes with the composite binder present excellent cycle stability (2092.9 mAh g −1 after 300 cycles at 400 mA g −1 ). In addition, the novel binder reveals well compatibility with commercial Si microparticles. More importantly, the self-healing Si anode is firstly equipped in an all-solid-LIB with solvate ionic liquid-based quasi-solid electrolyte and shows excellent cycling stability as well as rate capability.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yunfei Yao,Zhiying He,Xiangyang Xu,Yuanlin Tong,Dongsheng Chen,Chenyu Huang,Hongye Zhao
Following a flowsheet comprised of a hydrothermal reaction and a dehydration/carbonization, Si-xFe/O@C anodes featured with Fe-doping and carbon encapsulation were assembled. Comparing with pure Si, Si disseminated with in situ generated nano-scaled ferric oxide (Fe 2 O 3 ) particulates displays remarkably improved cyclic performance. Fe 2 O 3 may induce amorphization and optimize electrical conductivity, by enhancing the formation of Fe and Li 2 O amidst charging-discharging cycles. The as-derived Fe phase benefits the transport and storage of lithium-ion and electrons. Meanwhile, numerous tiny interfaces can be constructed between Fe granules and adjacent Li x Si or Li 2 O, and generate pseudocapacitance. After the carbonization of resorcinol-formaldehyde resin encapsulated on Si granules, core-shell structured Si- x Fe/O@C particulates can be assembled. Owing to the synergism of defect-rich structure, carbon layer well-wrapped thereon and interfacial pseudocapacitance, these nanocomposite anode materials exhibit long cyclic and upgraded rate performance. After 200 cycles, Si-0.42Fe/O@C anode retains a capacity of 929 mAh·g −1 at 1 A·g −1 and 735 mAh·g −1 at 2 A·g −1 . In the rate performance test operated at 5 A·g −1 , a high current density, 844 mAh·g −1 could be released. Si-0.42Fe/O@C can be charged with a specific capacity exceeding 250 mAh·g −1 over the potential range of 0.75-3 V at various current densities, demonstrating the contribution of nano-Fe pseudocapacitance effect to the energy storage of Si anodes.
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Chen Yang,Zhiting Luo,Wenhui Ma,Shaoyuan Li,Guoqiang Lv,Kaixin Fu,Kai Liu,Haonan Li,Huizhen Sun,Xiuhua Chen
Poly(3,4-ethylenedioxythiophene) (PEDOT):polystyrenesulfonate (PSS)/Si hybrid heterojunction solar cells (HHSCs) are fabricated by a solution-based synthesis method which combines the advantages of PEDOT:PSS and the superior performance of crystalline silicon. The optimized PEDOT:PSS–2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) hole transport layer (HTL) was used to prepare organosilicon solar cells with a short-circuit current density (Jsc) of 33.33 mA/cm2 and a photoelectric conversion efficiency (η) of 13.23%. The HTL films were found to have increased conductivity by the addition of an electron-accepting dopant (F4TCNQ), obtaining well-defined crystallinity and few defects. In addition, an one-step combination of F4TCNQ with a silane coupling agent (vinyltrimethoxysilane, VTMO) was used to improve the textured device, with a notable efficiency of 14.46% and a Jsc of 33.88 mA/cm2. Our study provides an alternative and easy way to establish organic–inorganic hybrid applications with excellent optoelectronic properties and to gain a deeper understanding of organic semiconductors.
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DOI
高影响因子
危险品化学品经营许可证（带存储）