Journal of the American Chemical Society
·
2023
·
IF 15
Chao Ma,Xiaona Liu,Yang Hong,Nana Yan,Chenyang Nie,Jing Wang,Peng Guo,Zhongmin Liu
The pure-silica zeolite plays a crucially important role in the gas separation of alkane/alkene, the low-k dielectric material, and the robust matrix for confining metal species during catalysis. However, the environmentally friendly synthesis of pure-silica zeolites is still challenging since (1) the toxic fluoride or dealuminum seeds are inevitably utilized through the hydrothermal synthesis and (2) it will also take a longer crystallization time. Herein, we present an efficient method called the OSDA-mismatch approach for the fluoride- and seed-free synthesis of pure-silica zeolites using Si-SOD (enriched 4-rings) as the sole silica source. This approach allows for the rapid and green synthesis of 15 pure-silica zeolites (CHA, *BEA, EUO, SFF, STF, -SVR, *-SVY, DOH, MTN, NON, *MRE, MEL, MFI, MTW, and *STO). Furthermore, distinct crystallization mechanisms of two significant pure-silica CHA- and *BEA-type zeolites (denoted as Si-CHA and Si-BEA) are investigated in detail by advanced characterization techniques such as FIB, 3D ED, 4D-STEM, HRTEM, Raman, and 29Si MAS NMR. More importantly, Si-CHA displays promising propane/propylene separation performance even better than the one synthesized in the presence of toxic HF. In addition, the incorporation of Zn species within Si-BEA fabricated by this approach also renders superior performance on propane dehydrogenation.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Qiongguang Li,Yanhong Wang,Jing Yu,Menglei Yuan,Qiangqiang Tan,Ziyi Zhong,Fabing Su
To mitigate the massive volume expansion of Si-based anode during the charge/discharge cycles, we synthesized a superstructure of Si@Co–NC composite via the carbonization of zeolite imidazolate frameworks incorporated with Si nanoparticles. The Si@Co–NC is comprised of Si-nanoparticle core and N-doped/Co-incorporated carbon shell, and there is void space between the core and the shell. When using as anode material for LIBs , Si@Co–NC displayed a super performance with a charge/discharge capacity of 191.6/191.4 mA h g −1 and a coulombic efficiency of 100.1% at 1000 mA g −1 after 3000 cycles, and the capacity loss rate is 0.022% per cycle only. The excellent electrochemical property of Si@Co–NC is because its electronic conductivity is enhanced by doping the carbon shell with N atoms and by incorporating with Co particles, and the pathway of lithium ions transmission is shortened by the hollow structure and abundant mesopores in the carbon shell. Also, the volume expansion of Si nanoparticles is well accommodated in the void space and suppressed by the carbon host matrix. This work shows that, through designing a superstructure for the anode materials, we can synergistically reduce the work function and introduce the confinement effect , thus significantly enhancing the anode materials' electrochemical performance in LIBs.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2019
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IF 2.683
Zigui Luo,Xi'an Fan,Wentao Hu,Fan Luo,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
In this work, Fe 2 SiO 4 /SiO 2 coated Fe-Si soft magnetic composites (SMCs) have been prepared successfully via ball milling Fe-6.5wt%Si/Fe 3 O 4 composite particles combined with subsequent spark plasma sintering (SPS) process. The formation mechanism of Fe 2 SiO 4 /SiO 2 insulating layer and effect of Fe 3 O 4 coating content on the microstructure and properties for the Fe-Si SMCs were investigated in detail. It is interesting that high temperature SPS process would lead to the occurrence of redox reactions between Fe 3 O 4 and Si from Fe-Si alloy cores, and resulted in the transformation from Fe 3 O 4 coating layer to Fe 2 SiO 4 /SiO 2 insulating layer. As a consequence, the novel Fe-Si SMCs exhibited superior performances including high saturation magnetization (190.4 emu/g) and low core loss (9.02 mW/cm 3 at 10 kHz) decreased by 89.1% compared to that of the uncoated Fe-Si SMCs (83.08 mW/cm 3 at 10 kHz). The results indicated that the method of preparing insulating layer by the redox reactions is a simple and effective way to synthesize new SMCs with high performance for electro-magnetic energy conversion equipments.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2021
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IF 7.311
Qiang Ma,Yan Zhao,Zuojun Hu,Jiakang Qu,Zhuqing Zhao,Hongwei Xie,Pengfei Xing,Dihua Wang,Huayi Yin
Low-cost silicon (Si) feedstocks and a facile method to downsize the particle size are two determinants for the application of Si for the lithium-ion battery anode. Among various Si feedstocks, the industrial bulk ferrosilicon (b-Si/FeSi 2 ) alloy is a promising Si resource, but decreasing the particle size and increasing the utilization of Si remain challenging. Herein, we report a self-driven alloying-electrochemical dealloying approach to converting the b-Si/FeSi 2 to nano-sized Si/FeSi (n-Si/FeSi) in molten salts using Mg to extract one Si atom from one FeSi 2 molecule by breaking down the FeSi–Si chemical bond and simultaneously forming Mg 2 Si. Subsequently, the obtained FeSi and Mg 2 Si are converted to nano Si and FeSi by electrochemically removing Mg from the Mg 2 Si anode to the cathode, making a circular use of Mg and increasing the electroactive Si content. Moreover, the polydopamine-coated n-Si/FeSi (n-Si/FeSi@C) anode exhibits a high capacity of 1449.7 mAh g −1 after 500 cycles at 0.4 A g −1 , and an extremely stable reversible capacity of 846.8 mAh g −1 is retained even after 1500 cycles at 2 A g −1 . Overall, this work provides an efficient method to convert industrial bulk Si/FeSi 2 to nano-sized Si/FeSi by leveraging the chemical bonds of Fe–Si and Mg–Si.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 8
·4226-4236
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IF 3.108
Youning Chen,Wei Zhao,Juncai Zhang
The study focused on the preparation of a chelating resin with pyridine ring as the functional group. The 4VP monomer was directly grafted on the surface of CMPS resin via SI-ATRP, and the performance of adsorption of resin for Cr(VI), Pb(II), Cr(III), Zn(II), and Cd(II) was determined. With the extension of ATRP time and increase of 4VP consumption, the 4VP grafting rate was linearly increased, indicating an increase in the density of the pyridine ring on the resin surface. Adsorption experiments indicated that the adsorption capacity of the resin for the metal ions considerably improved when compared with that of those reported in literature, whereas the desorption rate and reusability were equivalent to those of the conventional resins. When the pH value was greater than 5.0, Pb(II), Cr(III), Zn(II), and Cd(II) ions could be adsorbed; however, when the pH value was less than 3.0, Cr(VI) could be selectively adsorbed. These results are indicative of a potential application of the resin in the treatment of heavy metal wastewater. Therefore, adoption of one-step SI-ATRP is one of the effective methods for preparing a chelating resin with high capacity via the selection of an appropriate functional monomer.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
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IF 23.655
Jiang Meifang,Mu Pengzhou,Zhang Huanrui,Dong Tiantian,Tang Ben,Qiu Huayu,Chen Zhou,Cui Guanglei
The double-network binder shows excellent adhesive and self-healing abilities, which help suppress electrode volume expansion and stabilize the electrode interface upon cycling.
This binder induces a Li 3 N/LiF-rich solid electrolyte interface layer, which can suppress continuous electrolyte decomposition.
Superior electrochemical performance can be achieved in Si/Li half cells and LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Si full cells, even with a high loading of Si electrode.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2016
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IF 3.652
Jiajun Zhang,Beatriz Fidalgo,Dekui Shen,Rui Xiao,Sai Gu
This work investigated the decomposition of anisole (methoxyl-based lignin model compound) in a fluidized bed reactor over no catalysts and a series of HZSM-5 zeolite catalysts with different Si/Al atomic ratios. Transmethylation reaction was identified as the initial step of the thermal decomposition of anisole, leading to the prominent production of phenolic compounds. Methyl phenols were identified as the main products, with the yield of o -cresol being higher than that of p-cresol at the temperatures below 600° C. The transmethylation reaction over HZSM-5 zeolite catalyst was found to occur at temperatures 150° C lower than those for non-catalytic reaction, with the yield of the phenolic compounds being promoted by 2.5 times. Production of the main phenolic compounds during the catalytic decomposition of anisole was enhanced to different extents depending on the Si/Al ratio. The highest selectivity of 79 wt.% was achieved over the zeolite catalyst with a Si/Al ratio of 80. The Brønsted acid sites of the catalyst played a significant role in both the preferential formation of phenolic compounds and preservation of the methyl group.
研究领域:
催化化学
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能源化学
✓ 已验证
DOI
高影响因子
Heritage Science
·
2024
·Vol. 12
·期 1
·1-11
·
IF 2.6
Liu Yusong,Xu Qingmeng,Li Sifan,Xie Zhenbin,Li Qiang,Luo Hongjie,Ji Shidong
Large amount of ivory was excavated from Sanxingdui site which was waterlogged, severely degraded and in urgent need for conservation. There has been much effort for the conservation of waterlogged ivory by scientists. However, due to a lack of appropriate conservation material and the need to use non-destructive methods, no satisfactory results have been achieved previously. In this work, a novel formulated water-based Al–Si hybrid sol of size about 20 nm was prepared and introduced through a quasi-dynamic equilibrium method to waterlogged ivory tusk for the purpose of conservation. Good conservation performance could be achieved, since Al–Si sol gradually permeates into the interior of the ivory, distributes homogeneously and connects the loose components of ivory. Samples treated with appropriate amount of Al–Si sol displayed satisfactory compressive strength and porous intact structure. It was found that the fluidity of Al–Si sol had a significant influence on the conservation effect. Moreover, Al–Si sol not only consolidated HAP but also worked well on the soil embedded in unearthed ivory, which was beneficial to conserve ivory intactly. Slightly negatively charged Al–Si hybrid gel could interact with ivory matrix through multiple interactions including van der Waals force, electrostatic interaction, chemical and hydrogen bonding.
研究领域:
考古学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
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2021
·
IF 7.205
Mingde Tong,Qiangang Fu,Mingyu Liang,Tao Feng,Wanbo Hou,Jia Sun,Xinhao Shi
To optimize the impact-ablation resistance of SiC nws @PyC/HfC coating, PyC-SiC double-layer interface phase was introduced. After impacting test, the crack widths of SiC nws @PyC-SiC/HfC were much lower than that of SiC nws @PyC/HfC coating. The impact-ablation resistance of SiC nws @PyC-SiC/HfC coating was better than that of SiC nws @PyC/HfC coating. The good impact-ablation resistance SiC nws @PyC-SiC/HfC coating attributed to the two-grade pull-out reinforcement effect, self-sealing function of Hf-Si-O glass generated from oxidation of SiC nws @PyC-SiC core-shell structure and the precipitation of HfO 2 grains from Hf-Si-O glass under ablation environment.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2018
·Vol. 76
·期 3
·1081-1097
·
IF 1.589
Chen Youning,Zhao Wei,Yang Xiaoling,Li Yuhong
Using SI-ATRP technique, 1-vinylimidazole (VI) monomer was directly modified onto the surface of CMPS resin to prepare a chelating resin (PVI-g-PS) with imidazole ring as functional group. The adsorption properties of Cd(II), Ni(II), Pb(II) and Cu(II) were studied. It was found that with the increase in ATRP time and the amount of VIM, the graft ratio of VIM increased linearly, which indicated that the density of imidazole ring on the surface of resin increased. Adsorption experiments showed that the resin has good adsorption properties for Cd(II), Ni(II), Pb(II) and Cu(II). At pH 5.0, the static saturated adsorption amount of PVIM-g-PS for Cd(II), Ni(II), Pb(II) and Cu(II) was 2.82, 1.77, 1.22 and 0.83 mmol g −1 , respectively. The adsorption model could be described by Langmuir isothermal adsorption and the adsorption process accorded with quasi-first-order kinetic equation. In addition, the resin has good desorption rate and reusability. These findings suggest that the resin can be potentially applied to the efficient removal of heavy metal ions from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Changsheng Wu,Jiasong Huang,Zhiyong Wang,Xianbo Jin
This study proposes a low-temperature molten salt electrolysis strategy to prepare dendritic nanostructured silicon (nSi) from Al-Si alloys for high-performance lithium-ion battery anodes. The method uses the 403 K AlCl 3 -NaCl-KCl molten salt as electrolyte, in which aluminum is selectively removed from Al-Si (AlSi 12 , AlSi 20 , AlSi 30 ) alloys through anodic dissolution while metallic aluminum is recovered at the cathode. The resulting nSi exhibits tunable porosity dependent on the Al content in Al-Si, and the AlSi 12 -derived nSi 12 shows the highest specific surface area (48.7 m 2 g −1 ) and pore volume (0.21 cm 3 g −1 ) with interconnected 30–50 nm dendritic structures. When evaluated as anodes, nSi 12 demonstrates superior electrochemical performance with initial Coulombic efficiency of 91.1% at 1 A g −1 , retaining 2441 mAh g −1 after 100 cycles (or 80.0% capacity retention). The enhanced performance stems from its porous architecture buffering volume expansion, as evidenced by the electrode expansion after 100 cycles of 26% for nSi 12 versus 60.4% for nSi 30 . Comparative analysis reveals lower charge transfer resistance and higher Li + diffusion coefficient in nSi 12 . This method achieves an Al recovery rate of 95%, offering an energy-efficient, closed-loop approach for nanostructured silicon production with dual advantages in sustainable manufacturing and high-performance energy storage.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xueni Zhao,Pengfei Wang,Jiamei Zheng,Jiao Liu,Zhi Yang,Lijun Yang
Multilayered C–Si–Al coatings with various morphologies were deposited on carbon fibers (CFs) using magnetron sputtering . The thickness of the coatings was increased from 0.5 to 1.5 μm by magnetron sputtering between 90 and 120 min. C–Si–Al coatings of suitable thickness were heat-treated at 600 °C and transformed into C–Si–Al 2 O 3 coatings by one-step anodic oxidation (AO). The oxidation time for the one/two-step anodic oxidation and the ratio of oxidation time for the two-step anodic oxidation significantly influenced the morphologies of the C–Si–Al 2 O 3 (AO) coatings. Al 2 O 3 coatings with satisfactory morphologies and structures were prepared by two-step anodic oxidation with a total time of 30 min and a ratio of 1:1 between the initial and secondary oxidation times. The multilayered C–Si–Al 2 O 3 (AO) coatings were modified to C–Si–Al 2 O 3 coatings by secondary heat treatment at 1050 °C. Subsequently, hot-press sintering was used to prepare CFs with multilayered C–Si–Al 2 O 3 coating-reinforced hydroxyapatite (CF/C–Si–Al 2 O 3 /HA) composites. The multilayered C–Si–Al 2 O 3 -coated CFs demonstrated good resistance to oxidation and thermal shock . This could effectively protect CFs from oxidative damage and maintain its strengthening effect during sintering. The multilayered C, Si, and Al 2 O 3 coatings effectively reduced the difference between the coefficient of thermal expansion of the CFs and HA matrixes. The interfacial gaps between the multilayered coatings and HA were reduced. This could enhance the mechanical performance of the composites. The CF/C–Si–Al 2 O 3 /HA composites exhibited improved mechanical properties with a bending strength of 83.94 ± 12.29 MPa, and fracture toughness of 2.45 ± 0.08 MPa m 1/2 . This study can broaden the application of CF/C–Si–Al 2 O 3 /HA biocomposites as bone-repair materials and help obtain CF-reinforced composites with excellent mechanical properties that are fabricated or serviced at high temperatures.
研究领域:
材料科学
·
生物医学工程
·
陶瓷复合材料
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表面工程
·
生物材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）