INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Changhong Lin,Yan Zhou,Yuming Yang
Herein, the functional poly(vinylidene fluoride) (PVDF) film that has a superior UV-blocking performance was made through the surface-initiated activators regenerated by electron transfer atom-transfer radical polymerization (SI-AGET ATRP). The colorless polydopamine (PDA) initiator layer was adhered to the alkaline-pretreated PVDF film through the copolymerization of dopamine (DOPA) and initiator-bearing DOPA (DOPA-BIBB). Then the reactive organic UV absorbent [3-(4-benzoyl-3-hydroxyphenoxy)-2-hydroxypropyl] 2-methylprop-2-enoate (BPMA) was incorporated to the initiator layer by the SI-AGET ATRP method, resulting in the formation of a PBPMA-chain-grafted PVDF film (PVDF-g-PBPMA). Furthermore, the effects of the experimental conditions such as the BPMA concentration and reaction time on the performance of as-prepared modified films were investigated. The characterization results indicated the formation of the PBPMA film on the PVDF film surface and the outstanding UV-blocking performance of the modified films. The PVDF-g-PBPMA film fabricated under the optimum conditions could completely block the UV light in the range of 200–370 nm.
研究领域:
材料科学
·
高分子化学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Li-Ping Yang,Yang Wang,Xue-Qing Zhao,Xi-Jie Lin,Bei-Bei Zhang,Yong-Gang Sun,Song Chen
Hollow structure has great potential in lithium-ion batteries, especially in Si-based anode materials . Unlike the usual templating process, here, we report a template-free synthetic strategy to build hollow microspheres of Si-C hybrid materials , which combines an in-situ polymerization process to form precursor and magnesiothermic reduction towards the inner cavity. As a result, the hollow Si-C microspheres exhibit improved cycling performance (768.7 mA h g −1 after 100 cycles at 0.84 A g −1 ) and good rate capability (497.1 mA h g −1 at 8.4 A g −1 ) when used as an anode material in lithium-ion batteries. This work provides a controllable and industrially-scalable operation based on cheap source to synthesize hollow Si-C hybrid materials, which combines the advantage of hollow structure and carbon matrix to achieve better electrochemical performance than the solid one.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
RSC Advances
·
2026
·Vol. 16
·期 32
·29502-29514
·
IF 6.1
Shuman Gao,Xinxin Wang,Shaolei Gao,Mohammad Fahda,Dongyue Wang,Haijun Yu,Zijian You,Xiuning Liu,Liang Qi,Feng Shao,Peng Lu,Valentin Valtchev
JZO zeolite, the first stable aluminosilicate extra-large-pore zeolite, bridges the long-standing gap between microporous and mesoporous zeolites, offering highly accessible pore systems that are beneficial for molecular diffusion, active-site accessibility, and the processing of bulky molecules. However, the control of zeolite framework composition is limited, precluding its use in processes that require different acidic and ion-exchange properties. Here, JZO zeolites with tunable framework Si/Al ratios of ca. 15, 30, and 50 were successfully synthesized through precise adjustment of synthesis parameters, thereby broadening the synthesis window of this intriguing zeolite. A series of JZO zeolites was synthesized via a combination of the seed-assisted and the “deficient fluoride” methods. The crystallization kinetics of JZO was prominently boosted compared to the seed-free and fluoride-free counterpart systems, thanks to the accelerated formation of primary building units of JZO. Comprehensive characterization methods were employed to unveil the concerted role of seeds and fluoride ions. Dimethoxymethane carbonylation to methyl methoxyacetate reaction, a promising alternative route for producing degradable plastic monomers, was evaluated over JZO zeolites, and high activity (ca. 58%) and selectivity (ca. 84%) were achieved in JZO zeolite with Si/Al = 30 obtained by seed-assisted approach over a time-on-stream (TOS) test of 50 h. The product distribution could be rationally controlled by adjusting zeolite compositions. This work expands the viability of JZO zeolite synthesis and lays the foundation for practical applications.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jifei Liu,Zida Di,Yongzhi Wan,Kai Wang,Wanjun Sun,Jianfeng Dai,Weibo Zhang,Feitian Ran
Silicon (Si) has been envisaged as the most promising anode candidate for future lithium-ion batteries with high energy density and large power owing to its high theoretical capacity and abundance. However, the inherent drawbacks of Si anodes such as low electrical conductivity and volume variation seriously hinder their commercial scalable application. Here we demonstrate a magnesiothermic reduction process for converting marigold structured silica precursor into sub-micron silicon replicas. The complicated structured silica was converted into co-continuous composites of silicon, graphite and amorphous carbon layer by in-situ generation. This electrode delivers excellent rate capability with a discharge specific capacity of 631.7 mAh g −1 at 3 A g −1 and high cycling stability of 1114.9 mAh g −1 after 200 cycles at 0.1 A g −1 . Moreover, the coulombic efficiency increased rapidly from the initial 62–97.3% after only 10 cycles and 98.8% can be obtained with negligible fading after 200 cycles. Remarkably, some byproduct partially decomposed from surfactant can be in-situ derived into amorphous carbon layer deposited in the gap of wrinkled silicon spheres, which was effectively improves the complete conductive contact and the interface compatibility between active materials. This work provides a new design strategy for preparing Si-graphite anodes suitable for commercial applications.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
电池技术
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Junbo Zang,Jiahui Qi,Jiaxu Zhang,Hao Liu,Chunhong Zhang,Chengyue Zhang,Runtian Wu,Xiaochao Xu,Lei Shang
The preparation of high-performance, multifunctional, eco-friendly non-isocyanate polyurethanes remains a challenging task. Herein, we designed a bio-based five-membered ring carbonate containing O-Si-O and constructed a poly(hydroxy)urea-epoxy hybrid polymer (SNIPU) through its hybrid cross-linking with epoxy resin. Hybrid cross-linking endows SNIPU with a lower curing energy requirement, facilitating the formation of the cross-linked network. SNIPU with a microphase-separated hybrid cross-linked network exhibits excellent mechanical properties, with tensile strength, strain, and notched impact strength reaching 112.78 MPa, 13.72 %, and 46.57 kJ/m 2 , respectively. The hybrid cross-linked network and abundant hydroxyl groups confer excellent cohesive strength and interfacial bonding drive to SNIPU, enabling it to exhibit outstanding bonding strength (lap-shear strength of 14.61 MPa) and bonding universality when used as an adhesive. The presence of O-Si-O confers excellent flame-retardant, dielectric, and hydrophobic properties to SNIPU, providing potential support of high-performance, multifunctional non-isocyanate polyurethanes for its application in adhesives. This study provides a new technical approach for the preparation.
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yingshu Liu,Haiyang Tao,Xiong Yang,Xiaoyong Wu,Jinjuan Li,Chuanzhao Zhang,Ralph T. Yang,Ziyi Li
Adsorption is a promising technology for capturing nitrogen oxides (NO x ) from humid flue gases , for which as the preferred NO x adsorbent, zeolite with an appropriate silica to alumina (Si/Al) ratio provides the key step for success in practical applications. In this work, the effects of Si/Al ratio, temperature, relative humidity (RH), and feed gas (NO x -H 2 O(g)–CO 2 –O 2 -N 2 ) compositions on NO x sorption behavior on HZSM-5 zeolites were systematically investigated, based on a series of characterizations, fixed-bed adsorption and temperature programmed desorption (TPD) tests. The low-silica HZSM-5(25) showed the best performance (326.6 μmol/g and 39.2 μmol/g at dry and 90%RH) as compared to others with higher Si/Al ratios at each RH, in which the roll-up effect was positively correlated with the Si/Al ratios and humidity. O 2 enhanced NO x adsorption and reached an optimal adsorption capacity at the concentration of 14%, while CO 2 had little effect on NO x adsorption. The decrease in temperature increased NO x adsorption capacity on HZSM-5(25), benefitting from NO 2 physisorption as well as satisfactory NO oxidation within the active adsorbent structure. The facile thermal desorption of NO x and significant NO–NO 2 conversion on HZSM-5(25) was exhibited by bimodal TPD peaks at 343–353K and 533–543K respective for NO and NO 2 , in contrast to those on Silicalite-1. A potential “water-resistant” strategy via the enhancement of NO x adsorption competitiveness was revealed, providing a theoretical guideline for NO x adsorbent screening in industrial applications.
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产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 2
·1087-1102
·
IF 6.123
Li Chunyu,Hou Zehua,Li Pan,Zhang Guomin,Bai Liangjiu,Wang Wenxiang,Chen Hou,Yang Huawei,Yang Lixia
Cellulose nanocrystals (CNCs) have been widely used in the surface modification and construction of nanocomposites due to their excellent surface activity and high tensile strength. In this manuscript, nanocomposite hydrogels were prepared by implanting poly(glycidyl methacrylate)-modified CNCs (CNCs@PGMA) and biomass phytic acid (PA). After extracting CNCs from microcrystalline cellulose, PGMA was successfully grafted on the surface of CNCs by surface-initiated Activator Generated by Electron Transfer Atom Transfer Radical Polymerization (SI-AGET ATRP). With the assistance of PA, the reversible hydrogen bonding interaction between the internal structures of the matrix was promoted to construct the CNCs@PGMA/PA self-healing nanocomposite hydrogels. The obtained hydrogels by using CNCs@PGMA and PA as additives have excellent mechanical properties (tensile strength of 1.39 MPa) and self-healing ability (91.4% after 6 h). This study develops a facile method for the preparation of nanocomposite hydrogels with excellent self-healing properties. Graphical abstract
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DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 2
·733-743
·
IF 1.8
Wu Fangyi,Liu Zhonghao,Dong Yaqiang,Zhang Ruiheng,He Aina,Ling Yufan,Li Jiawei,Liu Xincai
Reducing the low-frequency loss (≤ 1 kHz) of the soft magnetic powder cores (SMPCs) while maintaining high saturation magnetic induction ( B s ) is beneficial to the high efficiency and energy saving of motor applications. Herein, the effects of silicone resin content (SI), compaction pressure, and annealing temperature on the magnetic softness, microstructure, and magnetic domains of Fe-6.5 wt.%Si SMPCs were systematically studied. The SMPCs with 1 wt.% SI content and pressed at 1800 MPa not only have good forming ability but also exhibit low total loss and high B s . According to the loss separation at 1 T and 1 kHz, the hysteresis loss accounts for more than 75% of the total loss. Annealing at 850 °C induces dense and large recrystallized grains with large-angle grain boundaries and easily mobile domain walls, resulting in low hysteresis and total loss. A higher temperature of 950 °C damages the cladding layer and causes direct powder-to-powder contact, which thus slightly increases hysteresis and eddy loss. The correlation between the core loss, microstructure, and magnetic domain provides a reference for the development of high- B s and low-loss SMPCs for high-efficiency motors.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yaru Li,Xiaoyan Liu,Jiwei Zhang,Haitao Yu,Jingwei Zhang
In order to more effectively alleviate the volume extension and shrinkage of the Si anode during Li intercalation/deintercalation processes, and also to improve the electron and ion transport dynamics, carbon coated Si-porous carbon composite fibres with a sandwich structure were prepared using a sacrificial template (ZIF-8) to construct mesoporous carbon, combined with electrospinning technology and subsequent hydrothermal carbon coating. The carbon fibre skeleton and carbon-coated sandwich structure provide support for the volume extension and shrinkage of Si, avoiding Si from directly contacting with the electrolyte, and forming a stable solid electrolyte interphase film. Furthermore, the polyvinylpyrrolidone spinning solution assists ZIF-8 to obtain a mesoporous structure inside the carbon fibre, which improves the specific surface area and pore volume of the composite material. In this case, the mesoporous structure also helps to alleviate the volume extension and shrinkage of Si during the charging /discharging processes and improves the transmission dynamics of lithium ions and electrons. Benefit from the unique structural features, this anode composite material exhibits enhanced electrochemical properties for Li-ion batteries, with a reversible specific capacity of 1114 mAh g −1 at 1 A g −1 , and demonstrates a capacity retention rate of 66% with a specific capacity of 740 mAh g −1 after 400 cycles.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chunyue Zhou,Xuzhong Gong,Yueke Feng,Jijun Lu,Yulong Fu,Zhi Wang,Junhao Liu
Low coulombic efficiency and poor cyclic stability are two common problems for silicon anodes. Therefore, it is of great significance to improve cycling performance and initial coulombic efficiency (ICE) via rational surface engineering on nano-Si anodes. Herein, a new nano-silicon anode is obtained by straightforward constructing a multifunctional polypyrrole protective layer on the surface of silicon nanoparticles , which is further used as the inner boundary of solid electrolyte interface (SEI) film. Specifically, the Li salt decomposition reaction between the electrolyte and silicon surface is effectively inhibited under the protection of the compact artificial boundary. The transfer of Li + for forming the SEI film is selectively slower than that of lithiation/delithiation reaction. This further reduces the amount of SEI film, leading to a high ICE of 93.2% at 0.5 A g −1 for modified nano-Si anodes. In addition, the flexible SEI precursor combined with the high proportion of organic components in SEIs not only accommodates the volume change of nano-silicon, but also suppresses accumulation of “waste SEI”, so the electrode can maintain a reversible capacity of 1153.2 mAh g −1 at 1 A g −1 after 500 cycles. This work provides important guidance for surface structural optimization of alloy-type anodes with high volume change.
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 26
·2111560
·
IF 19.924
Linlin Hu,Mihan Jin,Zhen Zhang,Haixia Chen,Farshad Boorboor Ajdari,Jiangxuan Song
Although Si and graphite (Si/C) composite materials are among the most promising alternative to graphite anode in commercial batteries because of high capacity, the issue of the poor structural and interfacial stability of the composite electrode is extremely challenging. Herein, an interface-adaptive triblock polymer binder that can interact Si and graphite particles to improve the particle affinity and binder spreadability via the supramolecular interactions of π∙∙∙π stacking and hydrogen bonding is presented. The strategy of enhancing the interfacial interactions can further effectively stabilize the electrode interface and minimize the electrode/electrolyte side reactions. Benefiting from this proposed binder, the Si/C anode retains a high reversible capacity (82.1%) after 400 cycles and delivers improved cycling stability even at high areal capacity (4 mAh cm −2 , 0.067% capacity loss/cycle) and in Si/C|LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cell (0.22% capacity loss/cycle). This design strategy for the binder provides a novel path toward high-energy, long-cycling Si/C anodes.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Cheng Wang,Siqi Huo,Guofeng Ye,Pingan Song,Hao Wang,Zhitian Liu
Epoxy resin (EP) features superior comprehensive performances, but inherent flammability seriously limits its industrial applications. Current flame-retardant strategies often bring about enhanced flame retardancy but deteriorated mechanical, thermal and optical properties and neglect flame retardant durability. Herein, a phosphorus/silicon-containing polyethylenimine (PES) is designed as a multifunctional curing agent for EP. Replacing polyethylenimine (PEI) with PES maintains high visible light transmittance of EPs and improves the UV-blocking properties. The EP cured by 30 wt% PES (EP/30PES) exhibits enhanced mechanical properties compared with the EP cured by 15 wt% PEI (EP/15PEI). EP/30PES achieves a limiting oxygen index (LOI) of 35.0% and a UL-94 V-0 rating, and its peak smoke release rate (PSPR) reduces by 63.8% relative to that of EP/15PEI. Hence, the great flame retardancy, smoke suppression and mechanical performances of EP/30PES enable it to outperform previous flame-retardant EP/aliphatic amine counterparts. Meanwhile, EP/30PES shows durable flame retardancy, which still achieves a UL-94 V-0 classification after acid/alkali/aging resistance tests. This work provides an advanced design of multifunctional curing agents to create durable fire-safe EPs with great UV-shielding and mechanical performances.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）