Chemical Science
·
2025
·
IF 7.4
Qijun Zheng,Yue Shen,Junjian Lu,Yan Xu,Xing-Hua Xia,Chen Wang
Nanofluidic membranes holds great potential for osmotic energy conversion. Creating high-efficiency ion-permselective membranes with well-fit channel structure continues to pose a persistent challenge. In this work, we design a novel dual asymmetric nanofluidic membrane with MXene and Nafion separately on the two sides of anodic aluminum oxide (AAO) for enhanced ion selective transport. Driven by osmosis, cations are initially separated by Nafion layer with rich negative charges, then followed by accelerated transport due to the interface potential abruptness between AAO channels and MXene layer. Following that, MXene layer acts as the second cation selective layer and further achieve ion charge separation. Benefiting from the dual ion selectivity and accelerated ions transfer, high cation transfer number of 0.95 can be realized using the present membrane. In addition, photo-thermal property of MXene could generate an additional thermal gradient under light irradiation, further promoting ions transfer. Taking advantages of the present two-sided asymmetric nanofluidic membrane, the output power could be up to 65.6 W m-2 at 500-fold NaCl salinity gradient, which is much higher than the majority of previously reported RED membranes (3.0~35.0 W m-2). The present work opens up a new strategy for constructing novel asymmetric nanofluidic devices for enhanced ion transport and osmotic energy harvesting.
研究领域:
材料科学
·
能源工程
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuan Wei,Mingjie Li,Linlin Li,Wanzhong Feng,Hongyue Wu
Supercapacitors, as advanced electronic devices and energy storage systems for the next generation of electric vehicles, have garnered significant attention owing to their myriad of beneficial attributes. Compared to bimetallic layered double hydroxides (LDH) materials, trimetallic LDH exhibits superior electronic conductivity, faster ion diffusion, and minimal volume variation when employed as supercapacitor electrodes. In this work, the novel NiCoCu-LDH/black phosphorus quantum dots (BPQD) are directly anchored to carbon cloth (CC) using a simple precipitation method combined with hydrothermal technology, along with electrostatic adsorption. Due to abundant active sites, enhanced electron transfer, and stable microstructure, the pseudocapacitance of the prepared CC@NiCoCu-LDH/BPQD is about 1810.6F g −1 (1 A/g). In addition, the assembled asymmetric supercapacitor CC@NiCoCu-LDH/BPQD//activated carbon demonstrates an exceptionally high energy density (202.2Wh kg −1 @800 W kg −1 ) at a satisfactory operating voltage of 1.6 V, along with an extended cycle life, maintaining about 81.4 % capacitance after 10,000 cycles.
研究领域:
材料科学
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能源存储
·
纳米技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Huimin Li,Shen Shen,Hongbo Wang,Jiajia Fu
The formation of dual-layer asymmetric porous structures in surfactant-based systems is significantly influenced by emulsions. Surfactants self-assemble to alter the conformational arrangement of polysaccharides, while gravity disrupts the initial uniformity of the established equilibrium droplet concentration gradient in the emulsion, thus achieving delamination. Specifically, high-speed rotation and non-instantaneous freezing allow the gelatin solution to form two different states of foam layers. The integrated dual-layer asymmetric porous structure, composed of polysaccharides and tannic acid, is constructed with gelatin as a skeleton and surfactant. This innovative approach eliminates the need to consider the toxicity of chemically synthesized surfactants and expands the concept of gelatin utilization. This intriguing structure exhibits a variety of desirable characteristics within 30 days ( e.g. , tailorable performance, ultrarapid antioxidant activity, efficient antibacterial activity, low differential blood clotting index, and good hemocompatibility and cytocompatibility), suggesting its potential as a valuable reference for applying hierarchical porous structures, thereby offering more formulation flexibility for biomaterials with adjustable properties.
研究领域:
生物材料学
·
生物医药工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Rui Wang,Mingjie Wei,Yong Wang
Covalent organic frameworks (COFs) has emerged as a highly promising platform material for the manufacturing of molecule-separating membranes. However, COF membranes are predominantly used in the separation of dyes from water or organic solvents and there are very few reports on COF-enabled membranes for desalination . In this work, the secondary growth approach based on unidirectional diffusion synthesis is developed to grow continuous thin films of a COF with an intrinsic pore size of 0.8 nm on macroporous substrates to prepare COF membranes for desalination. The amino-modified polymer microfiltration substrate is fixed in a diffusion cell to separate the oil phase containing the aldehyde precursor (1,3,5-triformylphloroglucinol, Tp) and the aqueous phase containing both the amino precursor (hydrazine, Hz) and the catalyst. Because of the immiscible bi-phase solutions and the high molar ratio of Hz to Tp, the unidirectional diffusion of Hz molecules in the pore channel of the substrate is achieved and the polycondensation between the two precursors occurs at the phase interface . The unidirectional diffusion synthesis is sequentially performed for two times and the secondary growth is essential to ensure the formation of a defect-free, continuous thin film of COF (TpHz) on the top surface of the substrate. Cladding COF coatings are also formed along the skeleton in the near-surface region of the substrate. Such an asymmetric structure ensures both a good permselectivity and a strong adhesion between the grown COF layers and the substrates. The continuous COF thin film grown on the substrates serves as the selective layer, and the COF membrane prepared under the optimized condition exhibits an appreciable Na 2 SO 4 rejection of 58.3% and a water permeance of 40.5 L∙m −2 ∙h −1 ∙MPa −1 which are ~ ten times higher than other membranes with similar rejections. This study not only demonstrates the potential of COFs in desalination but also showcases an efficient strategy to grow continuous thin films of COFs on porous substrates which are desired in diverse applications.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 13
·7907-7917
·
IF 10.733
Jing Yang,Hao-Nan Li,Zhi-Xiong Chen,Ai He,Qi-Zhi Zhong,Zhi-Kang Xu
Janus membranes (JMs) with opposite wettability have brought about new opportunities to tackle the challenging issues encountered in oil/water separation. However, these achievements suffer from empirical availability for the separation of oil-in-water emulsions, lacking a controllable way to tune the synergistic effect of asymmetric configurations, which is the “inner” driving force for practical performance. Herein, the role of the asymmetric configuration is theoretically and experimentally demonstrated in the Janus structural design, membrane fabrication, and separation performance for oil-in-water emulsions. These significant insights are particularly gained by analyzing Young–Laplace capillary pressures, measuring the adhesive forces between the oil and membrane surface, and monitoring the demulsification and oil transportation processes. Fluorescence imaging has been used to in situ visualize the separation process and then a mechanism is firstly proposed as demulsification followed by rapid unidirectional oil transportation for surfactant-stabilized oil-in-water emulsions. The two successive processes are strongly governed by the controllable asymmetric configuration of the JMs. An efficient oil separation can, therefore, be achieved from surfactant-stabilized oil-in-water emulsions with a wide size distribution (from nanometers to microns) by optimizing these two stages via tuning the hydrophilic/hydrophobic configuration and surface charge property of the JMs. Therefore, this work is expected to yield a design principle and guideline for developing JMs with applicability in the practical separation of oil-in-water emulsions.
研究领域:
材料科学
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环境工程
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界面化学
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产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200090
·
IF 9.14
Wenwen Bao,Senhe Huang,Diana Tranca,Boxu Feng,Feng Qiu,Fermín Rodríguez-Hernández,Changchun Ke,Sheng Han,Xiaodong Zhuang
Graphical Beauty in balanced asymmetry : An asymmetric Co II porphyrin ( as -PorCo) is constructed with a substituent of 2,6-dimethylbenzene to enhance the charge transfer capability from carbon nanotubes to as -PorCo, resulting in large partial current density of 8 mA cm −2 and high turnover frequency of 5656 h −1 at −0.7 V vs. reversible hydrogen electrode in aqueous solution. The present study provides the new insight into molecular design of catalysts for efficient electrochemical CO 2 reduction. The electrochemical reduction of carbon dioxide (CO 2 ) based on molecular catalysts has attracted more attention, owing to their well-defined active sites and rational structural design. Metal porphyrins (PorMs) have the extended π-conjugated backbone with different transition metals, endowing them with unique CO 2 reduction properties. However, few works focus on the investigation of symmetric architecture of PorMs as well as their aggregation behavior to CO 2 reduction. In this work, a series of Co II porphyrins (PorCos) with symmetric and asymmetric substituents were used as model of molecular catalysts for CO 2 reduction. Owing to the electron donating effect of 2,6-dimethylbenzene (DMB), bandgaps of the complexes became narrower with the increasing number of DMB. As electrocatalysts, all PorCos exhibited promising electrocatalytic CO 2 reduction performance. Among the three molecules, asymmetric Co II porphyrin ( as -PorCo) showed the lowest onset potential of −288 mV and faradaic efficiencies exceeding 93 % at −0.6 V vs. reversible hydrogen electrode, which is highly competitive among the reported state-of-art porphyrin-based electrocatalysts. The CO 2 reduction performance depended on π-π stacking between PorCo with carbon nanotubes (CNTs) and adjacent PorCos, which could be readily controlled by atomically positioned DMB in PorCo. Density functional theory calculations also suggested that the charge density between PorCo and CNT was highest due to the weak steric hindrance in as -PorCo, providing the new insight into molecular design of catalysts for efficient electrochemical CO 2 reduction.
研究领域:
催化化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Weijia Gong,Yanrui Wang,Haotian Zhang,Haochun Wang,Meng Zhang,Xiaobin Ma,Wenjun Cheng,Hailin Chang,Xiaobin Tang,Heng Liang
Rapid water permeability and precise solute–solute separation are both important for high-end nanofiltration (NF) membranes. Yet, current NF membranes suffer from high energy consumption or low efficiency because of a trade-off between membrane permeability and selectivity. An intricately designed polyamide (PA) separation layer can be used to construct high permeability-selectivity NF membranes. Inspired by the asymmetric structure between the surface and bottom layers of leaves, an innovative asymmetric leaf-like PA composite membrane with a highly ordered nanochannel bottom layer and loose PA surface layer structure was produced using alkali-induced MXene (AMXene) nanosheets. In this endeavor, small amorphous AMXene nanosheets were embedded in the bottom layer of the PA network via electrostatic attraction and hydrogen bonding to create short low-resistance 2D water transport nanochannels. These shorter nanochannels overcame the disadvantages of conventionally constructed nanofiltration membranes with long tortuous nanochannels comprising 2D nanosheets by reducing the transverse transmission resistance during NF. Furthermore, a loose ultrathin (18.48 nm) hydrophilic PA surface with low intrinsic resistance to water transport was obtained by limiting the diffusivity of interfacial-polymerized piperazine via the highly hydrophilic and electronegative AMXene nanosheets. Consequently, the water permeability of a thin-film nanocomposite membrane fabricated with 0.002 w/v% AMXene significantly increased by 1.63 times (17.48 L m -2 h −1 bar −1 ) over that of one prepared without the nanosheets owing to the reduction of transverse and normal energy barriers. Moreover, the asymmetric leaf-like PA composite membrane conferred a more homogeneous pore size distribution and more precise selectivity for targeted ion species of various sizes compared to conventional nanofiltration membranes. These findings provide new insights for manufacturing fast water-permeable NF membranes.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Wendi Guo,Zehui Sun,Meng-Jiao Xu,Kaizhi Wang,Mugeng Chen,Conglin Zhu,Heyong He,Yong-Mei Liu,Yong Cao
The efficient and environmentally friendly removal of halogen substituents from organic substances is crucial for reducing the ecological and health hazards posed by persistent halogenated compounds. In this regard, we introduce CoN3P1@NP-PC, a novel asymmetric CoN3P1 single-atom catalyst, which demonstrates outstanding efficiency in transfer hydrodehalogenation (HDH) using just two equivalents of HCOONH4 as a benign and effective reducing agent. This catalyst was synthesized through a simple post-implantation method, capitalizing the high porosity and large surface area of ZIF-8 precursors. Extensive characterization via a range of spectroscopic and microscopic techniques confirmed CoN3P1@NP-PC's superior atomic dispersion and asymmetric structural integrity, which was more favourable for HCOONH4 activation allowing facile generation of hydrogen radical along with electron transfer. In our comprehensive evaluation, CoN3P1@ NP-PC displayed outstanding versatility for transformation of a diverse array of halogenated substrates, efficiently processing compounds with varied functional groups and complex molecular structures. Notably, CoN3P1@NP-PC proved particularly effective in breaking down brominated flame retardants such as 2,4,6-tribromophenol and tetrabromobisphenol A, reinforcing its potential as a powerful tool for ecological restoration and pollution control.
研究领域:
催化化学
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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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Junjian Yu,Zhe Wang,Fei Wang,Shuai Han,Xiangwei Li
Mixed matrix membranes (MMMs) have been widely studied as the most promising gas separation membrane materials. However, the heterogeneous distribution of fillers within the membrane has not been fully explored. Herein, a series of asymmetric MMMs with selective, intermediate, and diffusion layers were constructed from top to bottom by gravity-induced deposition behavior of the fillers. MMMs exhibit extremely high CO2 separation performance for a particular asymmetric structure, changing the uniform permeability behavior of the gas. This also realizes the synergistic improvement of CO2 permeability and selectivity. In particular, the CO2 permeability of the UiO-H2O-27/Pebax-60 wt % MMM was up to 909.14 Barrer, which is 4.1 times higher than that of the homogeneous membrane (PCO2 = 223.64 Barrer). Compared to the pure Pebax membrane, the CO2 permeability of the optimized membrane increased 8.2 times (from 110.87 to 909.14 Barrer), and the CO2/N2 selectivity increased from 42.6 to 68, successfully surpassing the upper bound of 2019.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 2
·2200648
·
IF 5.006
Jia Zhou,Linna Dong,Xingfa Zeng,Liya Chen,Xiangrong Wei,Liyi Shi,Jifang Fu
Composite solid electrolytes are recommended to be the most promissing strategy for solid-state batteries because they combine the advantages of inorganic ceramics and polymers. However, the huge interfacial resistance between the inorganic ceramic and polymer results in low ionic conductivity, which is still the major impediment that limits their applications. Herein, a novel highly elastic and weakly coordinated ionic copolymer hybrid electrolyte with asymmetric structure based on surface-modified Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 by "in situ" polymerization is proposed to improve ionic conductivity and mechanical properties simultaneously. The all-solid hybrids electrolytes exhibit room-temperature ionic conductivity up to 2.61 × 10 −4 S cm −1 and lithium-ion transference number of 0.41. The hybrids electrolytes can be repeatedly stretching–releasing–stretching, showing a super stretchability with the elongation at break up to 496%. The Li symmetrical cells assembled with the hybrid electrolytes can continuously operate for 800 h at 0.1 mA cm −2 without discernable dendrites, indicating good interfacial compatibility between the hybrid electrolytes and lithium electrodes. The Li|LiFePO 4 batteries assembled with the hybrid electrolytes deliver an initial discharge specific capacity of 165.5 mAh g −1 with an initial coulombic efficiency of 94.8% and 154 mAh g −1 after 100 cycles at 0.1 C, and maintain 95.4% capacity retention after 100 cycles at 0.5 C.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Chenglei He,Lingjun Zeng,Bai Xue,Xingxing Zhang,Liya Yu,Lan Xie,Qiang Zheng
Along with the increasingly serious electromagnetic interference (EMI) pollution, it is in urgent need of exploiting high-performance EMI shielding materials. However, the conventional experimental methods always require a series of tedious preparation and characterization processes, resulting in the long period and high cost. Herein, a fully connected neural network (FCNN) was applied to aid in exploiting silver nanowires/waterborne polyurethan/multi-walled carbon nanotubes (AgNWs/WPU/MWCNTs) EMI shielding aerogels with asymmetric structures to optimize new material evolution and reduce experiment burden. Firstly, the special AgNWs/WPU/MWCNTs aerogels were fabricated with various MWCNTs content (0 wt%, 2 wt%, and 4 wt%) and AgNWs mass (10 mg, 20 mg, 30 mg, and 40 mg) via a combination of directional freezing and spraying procedures, leading to 12 distinct samples. AgNWs/WPU/MWCNTs aerogels hold excellent EMI shielding properties and absorption-dominant shielding mechanism. The experimental EMI shielding effectiveness (SE) data at different frequency were leveraged to establish, train, and test the FCNN model based on Adam optimizer (Adam-FCNN). It is worth noting that Adam-FCNN model predictions are in good accordance with the EMI SE of the physically measured samples, with the lowest root mean square error RMSE of 0.7899, the highest correlation coefficient (R) of 0.9895, and excellent computational efficiency and reliability. Moreover, Adam-FCNN can accurately prognosticate EMI SE of unobtained AgNWs/WPU/MWCNTs aerogels in mechanics-intuitions to reduce repeated preparation and characterizing conditions. Thereby, Adam-FCNN soft model approach opens significant potential for alleviating the experimental burden, accelerating the discovery of innovative materials, and exploring the complex mechanism.
研究领域:
材料科学
·
人工智能辅助材料设计
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Erqiang Yang,Yixin Wang,Tiegen Guo,Ge Chao,Xiaowei Zhou,Yuchen Zhang,Bin Hu,Zixin Lv,Huidong Qian,Kang Geng,Nanwen Li
Polybenzimidazole (PBI) membranes have attracted much attention for flow batteries due to their good chemical stability. However, the high area resistance (AR) of dense PBI limits its further development in VFBs. Herein, we design a sintering method to remove the phthalates with different molecular structures in the ternary system (PBI as polymer, N-methylpyrrolidone as solvent, and phthalates as non-solvent). Asymmetric PBI membranes with adjustable and disconnected pores, as well as ultrathin-dense layers, are prepared. This series of porous membranes shows excellent overall performance in VFBs. Among them, the porous NPBI-DBP-200 membrane (0.139 Ω cm 2 ) with DBP as the non-solvent exhibits a lower AR compared to the dense NPBI (0.489 Ω cm 2 ). At a current density of 200 mA cm −2 , the energy efficiency (EE) of a single cell assembled with the NPBI-DBP-200 membrane (EE = 78.26 %) has improved by 26.37 % compared to the dense NPBI membrane (EE = 61.93 %). In addition, the porous NPBI-DBP-200 membrane has excellent in-situ stability, and the single cell can operate stably for 1800 cycles at the current density of 120 mA cm −2 . This work presents a novel, easy-to-use technique for preparing high-performance porous PBI membranes with adjustable pore morphology.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）