CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xinying Zhu,Mingchen Mei,Dingxin Wang,Song Liu,Rui Liu,Xi Kong,Letao Yang,Houbing Huang
Ceramic capacitors with stable dielectric responses at elevated temperatures are of great importance for advanced electronic applications. In this study, high-entropy-engineered (Ba 0.85 Sr 0.15 )TiO 3 –Bi(Mg 2/3 Ta 1/3 )O 3 solid solutions were developed to achieve broad-temperature dielectric stability. Among them, the composition with 25% and 30% Bi(Mg 2/3 Ta 1/3 )O 3 exhibit excellent dielectric properties, exhibiting room-temperature relative dielectric constants of 663 and 680, and dielectric losses of 0.6% and 1.1%, respectively. Particularly, they meet the X9R and X10R specification and dielectric loss of ∼0.6%, with capacitance variation less than ±15% from −74 °C to 265 °C, satisfying the X9R. The composition with 30% Bi(Mg 2/3 Ta 1/3 )O 3 shows the room-temperature dielectric constant of ∼680 and the dielectric loss of ∼1.1%, and showing TCC values within ±15% from −60 °C to 300 °C, which meets the X10R requirement. The improved dielectric temperature stability is associated with high-entropy-induced relaxor behavior together with enhanced high-temperature insulation characteristics, which jointly suppress dielectric loss and leakage current over a broad temperature range. These results demonstrate that high-entropy design is an effective route for developing high-performance temperature-stable dielectric materials for high-temperature capacitor applications.
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Na Yang,Keting Li,Yufan Hao,Longfei Zhang,Yongli Sun,Luhong Zhang,Bin Jiang
Polyethyleneimine (PEI) nanofiltration (NF) membranes hold great application prospects in lithium extraction from salt lakes due to their high positive charge properties. However, the poor permeability of the membranes caused by the dense separation layer structure severely hinders their further application. Herein, a functional end-capping strategy was employed to address this problem by adding the effective end-capping reagent, Girard's Reagent T (GRT), to the PEI aqueous phase as the co-reaction reagent. Under the dual functions of the end-capping effect and the quaternary ammonium groups of GRT, the looseness and positive charge of the membrane were simultaneously optimized. After the modification of GRT, the looser structure of the PEI/GRT NF membrane improved its pure water flux (PWF) to 115 L m −2 h −1 at 6 bar, which was around 3.7 times higher than that of the original PEI NF membrane. Meanwhile, the enhanced positive charge (from −8 to 9 mV, pH = 7) of the membrane bottom surface allowed it to maintain the high rejection rate of MgCl 2 at 97.2 %. Besides, the PEI/GRT NF membrane exhibited good Mg 2+ /Li + selectivity (S Mg 2+ /Li + = 22.7, 2000 ppm, Mg 2+ /Li + mass ratio: 20:1). Therefore, this study provides a simple and feasible strategy for the preparation of high-permeable PEI NF membranes with good Mg 2+ /Li + separation performance.
研究领域:
材料科学
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环境工程
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yuanxiang Zhang,Tianlong Huang,Maosheng Cui,Xiaoxiao Wang,Zhen Mu,Mengting Yuan,Zilu Wei,Meng Yuan,Yanwei Sui,Jiqiu Qi,Yang Zhang,Xiaolan Xue
Although rechargeable magnesium batteries (RMBs) represent a promising post‑lithium energy storage technology, the formation of a non-conductive Mg 2+ passivation layer on Mg anodes remains a significant challenge. Here, we develop a novel all-inorganic electrolyte with low overpotential for Mg plating/stripping by introducing electrochemical active CuCl into a MgCl 2 /THF solution (MgCl 2 -CuCl/THF). During cycling, a multi-functional interface layer composed of Cu and Cu x Mg y Cl z is formed in situ on the Mg anode surface, which not only promotes MgCl 2 salt dissociation but also offer rapid-electron transport pathways. Moreover, the Cu + with reversible redox nature in Cu x Mg y Cl z can accommodate and release Mg 2+ ions, thereby facilitating rapid and homogenous Mg 2+ deposition. Consequently, the optimized MgCl 2 -CuCl/THF electrolyte enables Mg//Mg symmetric cells to cycle stably for over 1300 h at 0.5 mA cm −2 , with an overpotential as low as 0.15 V (vs. Mg 2+ /Mg). Furthermore, excellent Mg electro-plating/stripping properties have also been demonstrated in Mg//Mo, Mg//Cu, and Mg//SS asymmetric cells, achieving nearly 100 % Coulombic efficiency and stable cycling for over 138, 138, and 55 days, respectively. This work provides a promising strategy for the design of high-performance electrolyte systems for advanced RMBs.
研究领域:
储能
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电化学
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电池技术
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材料科学
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无机化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhiyuan Yi,Kai Qu,Linlong Zhou,Qing Li,Zhi Xu
Metal-organic framework (MOF) glasses offer promising potential for membrane-based separations due to their excellent processability and structural versatility. However, their inherently disordered pore structures often lead to reduced porosity and limited ion transport performance. Here, we present a controlled unzipping polymer decomposition (CUPD) strategy for fabricating ZIF-62-based glass membrane featuring interconnected and negatively charged transport channels. Polystyrene sulfonic acid (PSS) is introduced as a sacrificial porogen during the melt-quenching process, wherein partial decomposition of its carbon backbone templates the formation of interconnected micropores. Simultaneously, the sulfonate groups stabilized by coordination with Zn sites, imparted negative surface charge to the channels, facilitating the selective ions transport. The optimized membrane fabricated by CUPD strategy achieves a Li + permeation rate of 0.64 mol m −2 h −1 , which is 60-fold higher than that of the pristine ZIF-62 glass membrane. This work provides a novel inspiration for constructing MOF-based membranes with interconnected channels with tunable property for advanced ion separation applications.
研究领域:
材料科学
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膜分离技术
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无机非金属材料
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化学工程
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离子传输
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongye Lv,Xuyong Tian,Haowei Feng,Chunlei Wang,Liying Wei,Xiuping Li,Haolong Xue,Changfa Xiao,Dawei Ji
In recent years, many researchers have focused on incorporating functional nanomaterials into thin-film composite (TFC) membranes to synthesize thin-film nanocomposite (TFNi) nanofiltration (NF) membranes with intermediate layers. The stability of the intermediate layer was very important for the TFNi NF membranes. This study constructed a unique structure of ZIF-8@CNTs-OH@PEI nanocomposite intermediate layers on the polysulfone (PSF) supporting membranes, where hydroxyl-functionalized carbon nanotubes (CNT-OH) captured 2-methylimidazole through its porous structure and hydrogen bonding with hydroxyl groups, enabling zeolitic imidazolate framework-8 (ZIF-8) to grow on CNT-OH. In addition, polyethylenimine (PEI) could act as the “adhesive” among ZIF-8 and CNT-OH due to the strong adhesion of hydrogen bonding with abundant –NH 2 groups. Thus, the nanocomposite particles could form a stable intermediate layer on the surface of PSF membrane. Furthermore, the positively charged PA/ZIF-8@CNTs-OH@PEI/PSF composite NF membranes with strong interlayer bonding were synthesized through further interfacial polymerization reactions on the intermediate layer. In particular, the synthesized nanocomposite suspension of ZIF-8@CNTs-OH@PEI address the particle aggregation and poor dispersibility. Moreover, the structure of intermediate layer features abundant voids, which can reduce the transmembrane resistance of water and enhance permeation performance. Compared to the PA/M−0 without the intermediate layer, the PA/M−30 exhibited a significantly improved flux of 70.6 L m -2 h −1 , that was 2.6 times higher compared to that for PA/M−0. Additionally, the optimized PA/ZIF-8@CNTs-OH@PEI/PSF composite NF membranes achieved Li + and Mg 2+ retention rates of −25.5 % and 95.2 %, respectively, with a Mg 2+ /Li + separation factor (SLi, Mg) equal to 29.9, which showed good long-term operational stability.
研究领域:
材料科学
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膜技术
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分离科学
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纳米技术
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DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yueyu Liu,Lili Gao,Shiwei Li,Libo Zhang,Shaohua Yin
Nanofiltration (NF) has been recognized as a sustainable approach for lithium extraction from salt lakes. However, conventional thin-film nanocomposite (TFN) membranes face persistent challenges in overcoming the “trade-off”. This study reports a tunable growth strategy of MOF nanocrystals within the selective layer, enabling enhanced permeability and ion selectivity for lithium recovery from brine. Based on a “De novo synthesis” strategy, ultrasound-assisted in situ growth of smaller-sized NH 2 -ZIF-8 nanocrystals is achieved through controlled ligand substitution and nanocrystal size modulation within the separation layer. The optimized membrane exhibited outstanding performance, with a high Mg 2+ /Li + selectivity ( S Li/Mg = 113.97), high permeability (18.52 L m −2 h −1 bar −1 (LMH/bar)), and long-term stability over a 336-hour separation test. Furthermore, the mass transfer behavior during nanofilm formation has been elucidated by theoretically analyzing monomer diffusion kinetics and the variation of monomer concentration at the reactive interface. This work presents an efficient strategy for MOF generation and provides a promising pathway for the high-efficiency extraction of lithium from complex brine resources.
研究领域:
材料科学
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膜技术
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纳米技术
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分离科学
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化学工程
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产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Wentong Meng,Sifan Chen,Pu Chen,Feng Gao,Jianguo Lu,Yang Hou,Qinggang He,Xiaoli Zhan,Qinghua Zhang
Positively charged nanofiltration membranes have attracted much attention in the field of lithium extraction from salt lakes due to their excellent ability to separate mono- and multi-valent cations. However, the thicker selective layer and the lower affinity for Li + result in lower separation efficiency of the membranes. Here, PEI-P membranes with highly efficient Li + /Mg 2+ separation performance are prepared by introducing highly lithophilic 4,7,10-Trioxygen-1,13-tridecanediamine (DCA) on the surface of PEI-TMC membranes using a post-modification method. Characterization and experimental results show that the utilization of the DCA-TMC crosslinked structure as a space-confined layer to inhibit the diffusion of the monomer not only increases the positive charge density of the membrane but also reduces its thickness by ≈35% and presents a unique coffee-ring structure, which ensures excellent water permeability and rejection of Mg 2+ . The ion–dipole interaction of the ether chains with Li + facilitates Li + transport and improves the Li + /Mg 2+ selectivity ( S Li,Mg = 23.3). In a three-stage nanofiltration process for treating simulated salt lake water, the PEI-P membrane can reduce the Mg 2+ /Li + ratio of the salt lake by 400-fold and produce Li 2 CO 3 with a purity of more than 99.5%, demonstrating its potential application in lithium extraction from salt lakes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yong-Sheng Li,Yi-Wei Gao,Yi-Kun Zhu,Heng Zhang,Wen-Shuang Zhang,Yong-Heng Yin,Yu-Xia Zhang,Chong-Bin Wang
Efficient Mg 2+ /Li + separation is highly demanded to address the global lithium scarcity. The nanofiltration (NF) membrane prepared with PEI-based monomer possess positively charged surface, exhibiting promise potential in lithium extraction from salt lake brines. In this work, water-soluble metal phthalocyanine (PEI@CoPc) was synthesized via grafting reaction between PEI and the (Tetracarboxyphthalocyaninato)cobalt(Ⅱ). The light-responsive NF membrane was prepared via interfacial polymerization technique using the water-soluble PEI@CoPc as aqueous phase monomer alone. This strategic modification significantly enhances the water permeance and Mg 2+ /Li + selectivity of the membrane. The best-performing of PEI@CoPc-TMC/PES membrane shows a water permeance of 16.7 L m -2 h −1 bar −1 and a Mg 2+ /Li + selectivity of 29.5. The membranes exhibited exceptional selectivity towards magnesium ions while maintaining high lithium permeability, offering effective technical support for the efficient extraction of lithium resources from salt-lake brines. Moreover, the distinctive photocatalytic activity of PEI@CoPc can generate active oxidizing species such as superoxide radicals (•O 2 – ) to oxidatively degrade pollutants, conferring the membrane excellent self-cleaning capability. The results indicated that the prepared composite membrane exhibit excellent fouling resistance and self-cleaning performance.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Yaoxian Hu,Hui Su,Zhaowu Zhu,Minxiu Zhou,Tao Qi
The tributyl phosphate (TBP)/FeCl 3 system has been widely used for lithium extraction from high‑magnesium salt lakes. However, at high TBP concentrations, the Li/Mg selectivity is significantly lower. This study revealed that at high TBP concentrations, TBP alone extracted Mg 2+ to form MgCl 2 ·6TBP as the main product, thus affecting the extraction efficiency of Li + . On this basis, a neutral phosphate with long carbon chains, trioctyl phosphate (TOP), was used to replace TBP. The separation capacity and extraction mechanism of the TOP/FeCl 3 system were studied, and density functional theory (DFT) calculations were employed to model the cationic complexes of the TOP and TBP systems. The results showed that in the presence of FeCl 3 , the extraction efficiency of Li + (E Li ) reached 91 %, and the Li/Mg separation factor (β Li/Mg ) was 5688. In contrast, in the TBP/FeCl 3 system with the same concentration, the E Li and β Li/Mg values were much lower at 74 % and 239, respectively. Furthermore, the TOP complex of Li + had shorter Li − O bond lengths and a more negative binding energy, while that formed with Mg 2+ had longer Mg − O bond lengths and the smallest HOMO–LUMO gap, indicating that TOP bonded more stably with Li + and was less prone to Mg 2+ extraction than TBP.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Plasmonics
·
2016
·Vol. 12
·期 3
·717-727
·
IF 2.146
Zhang Yan,Jiang Jingjing,Li Min,Gao Pengfei,Zhang Guomei,Shi Lihong,Dong Chuan,Shuang Shaomin
A highly selective and ultra-sensitive colorimetric assay has been developed for detecting the magnesium ion (Mg 2+ ) based on pectinase (PE)-protected Au nanoparticles (PE-AuNPs). This is the first study reporting the use of pectinase for green synthesizing gold nanoparticles. Aggregation of PE-AuNPs was induced immediately following the addition of Mg 2+ ion under Tris-HCl buffer at pH 4.0, yielding a color change from red to blue, and the characteristic surface plasmon resonance (SPR) peak of PE-AuNPs was red-shifted to 665 nm. The effects of parameters such as pH, the amount of PE-AuNPs, and incubation time on the sensitivity of colorimetric assay were investigated in detail. The Mg 2+ -induced aggregation of PE-AuNPs could be monitored by both the naked eye and UV–vis spectrophotometry. The lowest detection concentration with the naked eye is 0.52 μM. A linear relationship between the absorbance ratio ( A
665 / A
523 ) and Mg 2+ concentration was observed in two ranges of Mg 2+ concentration by UV–vis spectrophotometry, including 5.34 × 10 −7 μM to 51.4 μM and 5.12 × 10 2 μM to 3.19 × 10 3 μM. The Mg 2+ detection limit was determined to be 4.0 × 10 −9 μM with UV–vis spectrophotometer. The proposed colorimetric assay possesses a highly selective response for Mg 2+ over other metal ions. This method has been successfully applied to determine the Mg 2+ ion in some water samples.
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xuyan Qin,Wutao Wei,Ximin Ling,Changwei Shan,Zhao Liu,Mingjie Song,Zhikai Wang,Xi Jia,Liwei Mi
The design of a simple and safe method for constructing heterojunction structures in nanocomposites is a promising strategy for the manufacture of high-performance electrochemical energy storage devices. In this paper, based on the “less-liquid” reaction system and the assistance of the generated NaCl, a heterojunction-containing zero-dimensional (0 D) CoS2/NiS2 nanocomposite with particle sizes ranging from 50 to 200 nm were prepared. During this reaction, the reactant carries crystalline water to provide a liquid environment. Similarly, the lattice occupation of the generated NaCl promotes the construction of a large number of heterogeneous structures inside the nanostructured materials. The prepared material was subsequently employed as a cathode material for the Mg2+/Li+ hybrid battery (MLHB). The interface effect of the heterostructures induces an electric field within the nanocrystals, resulting in a lower ion diffusion resistance, and facilitating interfacial electron transport. Therefore, the heterojunctions accelerated the diffusion dynamics at the interface, and increased the charge-transfer rate. Mg2+ and Li+ exhibit reversible synergistic effects. More specifically, at a current density of 0.2 A g–1, the initial discharge specific capacity was 785.5 mAh g–1, while at a current density of 0.5 A g–1, a discharge specific capacity of 317.54 mAh g–1 was maintained over 200 cycles. And the Coulombic efficiency was maintained at ∼99.8%. This simple and safe design method for nanoscale heterogeneous materials provides a method for developing high-performance MLHB cathode materials.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ximin Ling,Wutao Wei,Changwei Shan,Xuyan Qin,Mingjie Song,Zhao Liu,Liwei Mi
Mg 2+ /Li + hybrid batteries (MLHBs), which support the rapid insertion and removal of Mg 2+ /Li + bimetallic ions, are promising energy storage systems. Inspired by the Kirkendall effect, ball-in-ball bimetallic sulfides with heterostructures were prepared as cathode materials for the MLHBs. First, a nickel–cobalt precursor (NiCo-X precursor) with three-dimensional (3D) nanosheets on its surface was prepared using a solvothermal method based on the association reaction between alkoxide molecules. Subsequently, the NiCo-X precursor was vulcanized at high temperature using the potential energy difference as the driving force to successfully prepare NiS 2 @CoS 2 core–shell hollow spheres. When used as the positive electrode material for the MLHBs, the NiS 2 @CoS 2 hollow spheres exhibited excellent Mg 2+ /Li + ion storage capacity, high specific capacity, good rate performance, and stable cyclic stability owing to their tough hierarchical structure. At a current density of 500 mA g −1 , a specific capacity of 536 mAh g −1 was maintained after 200 cycles. By explaining the transformation mechanism of Mg 2+ /Li + in bimetallic sulfides, it was proven that Mg 2+ and Li + worked cooperatively. This study provides a new approach for developing MLHBs with good electrochemical properties.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）