Nanomaterials
·
2019
·Vol. 9
·期 4
·650
·
IF 4.034
Xing Li,Yongshun Bai,Mingshan Wang,Guoliang Wang,Yan Ma,Yun Huang,Jianming Zheng
Silicon is the one of the most promising anode material alternatives for next-generation lithium-ion batteries. However, the low electronic conductivity, unstable formation of solid electrolyte interphase, and the extremely high volume expansion (up to 300%) which results in pulverization of Si and rapid fading of its capacity have been identified as primary reasons for hindering its application. In this work, we put forward to introduce dual carbonaceous materials synergetic protection to overcome the drawbacks of the silicon anode. The silicon nanoparticle was coated by pyrolysed carbon, and meanwhile anchored on the surface of reduced graphene oxide, to form a self-standing film composite (C@Si/rGO). The C@Si/rGO film electrode displays high flexibility and an ordered porous structure, which could not only buffer the Si nanoparticle expansion during lithiation/delithiation processes, but also provides the channels for fast electron transfer and lithium ion transport. Therefore, the self-standing C@Si/rGO film electrode shows a high reversible capacity of 1002 mAh g−1over 100 cycles and exhibits much better rate capability, validating it as a promising anode for constructing high performance lithium-ion batteries.Keywords:silicon;carbon coating;reduced graphene oxide;self-standing film;anode
研究领域:
材料科学
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能源存储
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu Jiang,Rong Yang,Chaojiang Fan,Xin Dong,Hongyu Shang,Lei Mao,Bailing Jiang,Yinglin Yan
As one of the most important prerequisites for the practical application of lithium-sulfur (Li-S) batteries, the efficient utilization of active materials still meets the challenge to activate the dissolved polysulfide between the cathode side and the separator. The MXene has metallic centers and rich surface functions to anchor polysulfides, which prevent the shuttle of polysulfides, is widely used in Li-S batteries. However, the self-stacking defects of MXene hinder its chemisorption and catalytic of polysulfides. Here, a plain, scalable additive plug-in scheme was designed for MXene, and the self-supporting film obtained by dual-intercalation supplied an interlayer for Li-S batteries. The macromolecular cetyltrimethylammonium bromide is used to open the layer distance of MXene and expose the catalytic sites, and the nanometer carbon nanotubes are employed as the second insertion to distribute the conductive carbon networks on the MXene nanosheets to physically confine the polysulfides. The functional interlayer carries adsorption and catalytic activities toward polysulfides conversion. Therefore, the Li-S batteries with the interlayer had an initial discharge specific capacity of 1491.8 mA h g −1 at 0.1 C, and an ultra-low-capacity decay of 0.038% per cycle after 500 cycles at 1 C. This work provides an effective strategy on MXene to construct functional intermediate layer for Li-S batteries to hinder the shuttling effect and catalyze the redox conversion of the polysulfides.
研究领域:
材料科学
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能源存储技术
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Shouzhi Yan,Dongdong Shen,Md All Amin Newton,Suiyuan Zhu,Binjie Xin
Self-supported nanofiber membranes were fabricated by the rhombus-patterned collector in the electrospinning process in this work. The rhombus nanofiber networks were used to retain the mechanical flexibility of the device and stable responses such as bending and winding deformation. A resistive humidity sensor was developed by applying hydrophilic PANI with varying contents onto nanofiber surfaces through in situ polymerization, serving as electrodes. In this context, the self-supported membranes serve dual roles as both the sensing material and the substrate for the sensor. A comprehensive assessment was conducted to analyze how variations in relative humidity affect the sensing characteristics of the acquired sensors. By facilely regulating the ratio of dopant and oxidant concentration to monomer concentration in the polymerization process, the response of the sensors was increased from 49% to 83% with increasing relative humidity from 13% to 93%, good linearity (R 2 = 0.97) and a short response/recovery times (33/88 s). The prepared sensors exhibited appreciable mechanical properties and showed outstanding stability after 1000 cycles of bending and the resistances only slightly increased by 2.5%. Moreover, the sensor can monitor both human respiration and non-contact skin humidity. Its exceptional performance makes it easily integrable into textiles for the creation of wearable electronics.
研究领域:
材料科学
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传感器技术
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生物医学工程
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 39
·期 2
·181-188
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IF 3.154
Cao Jiang-Yong-Quan,Chen Si-Chong,Zhang Jie,Xie Yang-Yang,Wang Yu-Zhong
Due to the important role of oil source in our life, the separation of water-in-oil emulsion is urgent and necessary. Membrane seperation technology has been an efficient and widely used method in separating oil-water separation. Herein, we report a versatile approach to fabricate surface carbonized membranes with self-standing property from biomass-derived precursor by synergistic charring of phytic acid, arginine and filter paper. The obtained membrane exhibited superhydrophobicity in oil, excellent fouling resistance, and self-supporting ability. The membrane can be cycle-used at least 12 times with high permeation flux (up to 1380 L·m −2 ·h −1 ) and separation efficiency (up to 99.4%).
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yi Cao,Peiyuan Tang,Yue Han,Wenfeng Qiu
In this study, we succeed to synthesize the lanthanum titanate (LTO) flexible self-supporting film, and the flexible electrode based on the self-supporting film as active material were also provided to verify the electrochemical energy storage performance. The self-supporting film with both excellent flexibility and outstanding crystalline structure has been prepared by electrospinning combined with calcination method. To further optimize calcination processing, the microstructure, morphological characteristics and lattice structure of the self-supporting films can be explored by using SEM、TG、XRD and FT-IR. What’s more, the electrochemical properties of the flexible electrode prepared by LTO self-supporting film have been determined in various solutions. Comparing with the other aqueous, the highest areal capacitance of 806.2 mF cm −2 at 2 mA cm −2 was got form 1 M Na 2 SO 4 aqueous electrolyte. Moreover, the symmetrical LTO//LTO flexible device fabricated by two LTO electrodes has a maximum areal capacitance of 149.2 mF cm −2 at a current density of 2 mA cm −2 with a high cell voltage of 2.1 V. As the result of that, this device exhibits a high energy density of 91.4 μWh·cm −2 at a low power density of 2.1 mW cm −2 with outstanding cycling life and excellent bending stability. Therefore, the LTO self-supporting film can be considered as a prospective material for wearable energy storage device.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 8
·1844
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IF 3.2
Shuling Shen,Ji Wang,Yaru Li,Xinjuan Liu,Zhihong Tang,Huixin Xiu,Jing Li,Guanglei Zhou
Graphene quantum dots (GQDs) show significant promise as antibacterial agents, but their application is hindered by several limitations, including potential cytotoxicity at high concentrations, as well as concerns regarding aggregation and reusability. In this study, sodium titanate (NTO) ultralong nanotubes were utilized as both a photocatalyst and support for GQDs. The NTO/GQDs heterojunction was formed by embedding GQDs nanoplates onto the walls of NTO nanotubes. This integration significantly improved the visible light absorption and enhanced the separation and transfer of electron–hole pairs, leading to an efficient photocatalytic antibacterial process. The NTO/GQD-8 self-supporting membrane composed of these ultralong nanotubes demonstrated outstanding antibacterial efficiency (99.99%) againstE. coliand exhibited remarkable cycling stability. Radical scavenging experiments revealed that ∙OH and e−were the primary reactive species driving the photocatalytic antibacterial process. Notably, NTO and NTO/GQDs-8 exhibited distinct antibacterial outcomes. After photocatalytic treatment with NTO/GQDs-8,E. colicells were completely fragmented, with no intact cell structures remaining due to the synergy effect of GQDs’ physical cutting during photocatalytic treatment.
研究领域:
材料科学
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微生物学
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环境科学
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DOI
PubMed
高影响因子
Carbon Capture Science & Technology
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2025
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IF 10.5
Dudu Li,Zhifang He,Ying Chen,Zelong Xu,Zibo Yang,Hao Zhang,Zhihua Qiao
Carbon nanotubes (CNTs), known for their elevated specific surface area, exemplary mechanical properties and thermal stability, are regarded as optimal reinforcing fillers for the fabrication of mixed matrix membranes (MMMs). In this study, self-supported MMMs were prepared using melted zeolitic imidazolate framework (ZIF), denoted ZIF-62 glass, as the continuous phase and multi-walled CNTs (MWCNTs) particles as the dispersed phase. The resulting membranes were thoroughly characterized, and the effect of different incorporation amounts of MWCNTs on the gas separation performance was investigated. It is noteworthy that at an incorporation amount of 4 wt. % MWCNTs, the ideal selectivity of prepared self-supported ( a g ZIF-62) 0.96 (MWCNTs) 0.04 MMM for CO 2 /N 2 and CH 4 /N 2 was 31.2 and 8.6 respectively, exceeding the 2019 Robeson upper bound. The results demonstrated that MWCNTs have excellent gas transport properties and significantly enhance the separation performance. Furthermore, the self-supported ( a g ZIF-62) 0.96 (MWCNTs) 0.04 MMM also exhibited excellent mechanical properties and pressure resistance, making them highly promising candidates for advanced gas separation applications. This study not only highlights the effectiveness of MWCNTs as functional fillers in MMMs but also presents a novel approach for designing high-performance gas separation membranes.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
高影响因子
ACS Omega
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2020
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IF 2.87
Yi Cao,Peiyuan Tang,Wenfeng Qiu,Tong Zhao
Flexible all-solid-state supercapacitors have drawn more attention owing to the rapid growth of wearable electronic equipments. Herein, we have succeeded in synthesizing a series of Y-doped lanthanum titanate flexible self-supporting films (LSF-x, 0.1 ≤ x ≤ 0.5) and investigating the change of microstructures, morphological characteristics, and lattice structures of these films affected by different Y-doping contents. To further determine the optimum Y-doping content, we have explored the electrochemical properties of working electrodes prepared by LSF-x (0.1 ≤ x ≤ 0.5) samples as the main active material. As the LSF-0.2 electrode has the best areal capacitance of 1.3 F·cm–2 at 2 mA·cm–2, we use the LSF-0.2 electrodes and PVA–Na2SO4 gel to fabricate a flexible all-solid-state supercapacitor device. This device has a high areal capacitance of 255.9 mF·cm–2 at a current density of 2 mA·cm–2 with a high cell voltage of 2.1 V, while the corresponding energy density is 156.8 μWh·cm–2 with a power density of 2.1 mW·cm–2. Moreover, it also shows a long cycling life and outstanding flexibility. Therefore, the LSF-0.2 sample can be used as an excellent energy-storage material for a wearable electronic device.
研究领域:
材料科学
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能源技术
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纳米科技
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 111
·109992-110000
·
IF 3.289
Zhiyong Zhou,Ke Cui,Yu Mao,Wenshuai Chai,Nian Wang,Zhongqi Ren
Enantioseparation of chiral compounds is important for pharmaceutical production. Chiral resolution of racemic tryptophan has attracted increasing attention. Traditional separation methods have the disadvantages of being high cost, energy intensive and environmentally unfriendly. Membrane permeation seems promising for application in the enantioseparation of racemic tryptophan with the advantages of energy efficiency and no additives. However, lots of organic compounds are commonly used for the preparation of various membranes for enantioseparation of racemic tryptophan. Therefore, we prepared a molecularly imprinted self-supported membrane (MISM) using a green and clean method with natural polymer sodium alginate (SA) as the functional polymer, water as the solvent and CaCl2 as the crosslinking agent. The crosslinking by CaCl2 was confirmed by attenuated total reflection Fourier transform infrared (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. The surface and internal structures of the MISM and non-imprinted self-supported membrane (NISM) were observed by atomic force microscope (AFM) and scanning electron microscope (SEM). The addition of a template molecule can significantly improve the MISM surface roughness. The compact structures of MISM and NISM were confirmed by the cross-sectional images. The thermo stability of MISM was studied. In addition, the effects of pH and crosslinking time on the swelling behavior of MISM were investigated. A high concentration of OH− in alkali solution can remarkably weaken the electrostatic interaction between Ca2+ and COO−. The effects of preparation conditions, permeation conditions and concentration polarization on the pressure-driven permeation performance of MISM were investigated. Ultrahigh enantioseparation performance in 99% ee of the permeation solution can be obtained under mild conditions. Reducing the concentration polarization by increasing the environmental temperature and continuous stirring is beneficial to obtaining ultrahigh ee. Comparison with previous studies on pressure-driven permeation performance indicates that the proposed green and clean preparation method for a molecularly imprinted self-supported membrane is not only environmentally friendly but also efficient in obtaining ultrahigh ee.
研究领域:
生物化学
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环境科学
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制药工程
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DOI
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Rongjie Yang,Shanshan Liu,Qi Sun,Qiaobo Liao,Kai Xi,Bin Su
Covalent organic framework (COF) membranes with tailored functionalities hold great promise in diverse applications, but the key to realize their full advantages of highly ordered pore structures is the development of membrane fabrication approaches. In this work, we report a potential difference-modulated biphasic strategy to fabricate large-area, self-standing COF membranes under ambient conditions. The fabrication was conducted at the polarized water/1,2-dichloroethane (water/DCE) interface, where HCl was dissolved in water as a catalyst and monomers (both amine and aldehyde) were added to DCE. The external polarization of the water/DCE interface by cyclic voltammetry can continuously pump H+ from water to DCE to boost the Schiff base reaction of monomers and the growth of COF membranes. Moreover, the growth process can be real-time-monitored by interfacial double-layer capacitance measurement, and the permeability of COF membranes can be in situ-examined by heterogeneous ion transfer voltammetry. Given that the potential difference across the water/DCE interface can be also facilely modulated by dissolving proper electrolyte ions in two phases, the fabrication of large-area COF membranes is made possible in beakers. Using this strategy and different monomers, three types of centimeter-scale, free-standing COF membranes with tunable pore size and surface functionality were prepared, and their defect-free structure was proved by the molecular permeance and ultrafiltration test. We believe that this biphasic strategy offers a controllable and scalable way to fabricate COF membranes and sheds light on development of novel self-supporting membranes with unique functions.
研究领域:
材料科学
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化学工程
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膜技术
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DOI
PubMed
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 10
·3799-3809
·
IF 8.1
Xu He,Li Wanying,Huang Ling,Zeng Danli,Zhang Yufeng,Sun Yubao,Cheng Hansong
Exploring self-supporting polymer electrolyte membranes that exhibit both high ionic conductivity and cation transference poses a challenge for lithium metal secondary batteries. In this research, we utilized poly(4,4′-(diphenyl ether)-5,5′-bibenzimidazole) (O-PBI) and grafted it with lithium propanesulfonyl(trifluoromethyl sulfonyl)imide (PBI- g -LiPSI) through a nucleophilic substitution reaction involving sodium 3-iodopropanesulfonyl(trifluoromethyl sulfonyl)imide (NaIPSI) and pre-activated O-PBI with lithium hydride. This process was followed by a lithium-ion exchange. The excellent leaving ability of the iodine substituent in NaIPSI allowed for a grafting ratio close to 100%, resulting in the highest possible lithium content. Moreover, the strong π−π interaction among the aromatic polybenzimidazole facilitated the formation of a self-supporting polymer electrolyte membrane, even when doped with zwitterionic 1-propanesulfonyl (trifluoromethyl sulfonyl)imide-3-methylimidazolium (MeImPSI). The ionic conductivities and 7 Li nuclear magnetic resonance chemical shifts of MeImPSI-doped PBI- g -LiPSIs showed a linear increase with the doping mass fraction of zwitterion. This finding confirmed that the zwitterion can act as a dipole, reducing the electrostatic attraction between the lithium cation and immobilized bis(sulfonyl)imide anion. Among different doping ratios, a 25-wt% MeImPSI-doped PBI- g -LiPSI exhibited the highest ionic conductivity of 0.68 mS cm −1 at room temperature, along with a lithium transference number of 0.95. To assess the performance of the electrolyte as well as separator, a lithium symmetric cell was assembed using the 25-wt% MeImPSI-doped PBI- g -LiPSI. The cell exhibited stable performance during galvanostatic cycling at ±0.5 mA cm −2 with a charge-discharge capacity of 2 mA h cm −2 , for an impressive duration of 2100 h. Additionally, we successfully demonstrated the application of single-ion conducting lithium metal secondary batteries. The film-forming property of PBI, combined with the enhanced ionic mobility provided by the zwitterion contributed to the overall excellent performance of the single-ion conducting polymer electrolyte system.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 14
·145701
·
IF 2.9
Shuyan Yu,Huiying Zhang,Yan Zhou,Congju Li
Due to the misuse and overuse of the antibiotic tetracycline (TC), as well as its refractory degradability, it has become a stubborn environmental contaminant. In this study, a self-standing polyacrylonitrile-based ZIF-67@CNT/ACF aligned anodic membrane was fabricated by innovatively incorporating ZIF-67@CNT nanoparticles into an aligned carbon nanofiber (ACF) membrane to treat the TC. The flow-through nanoporous construction of the ZIF-67@CNT/ACF membrane reactor can compress the diffusion boundary layer on the electrode surface to enhance mass transfer under microscopic laminar flow, which can further enhance the degradation rate. In addition, the enhanced degradation performance also benefited from the significant electrooxidation capacity of the ZIF-67@CNT/ACF membrane. At the optimal electrocatalytic condition of 3.0 V applied potential and pH 6, the degradation rate reached 81% in 1 h for an initial TC concentration of 10 mg l−1. The refractory and highly toxic TC was electrochemically degraded into small non-toxic molecules. Our results indicate that electrocatalytic TC degradation can be enhanced by ZIF-67@CNT/ACF membrane.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）