MATERIALS LETTERS
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2025
·
IF 2.7
Yufang Chen,Lanlan Zuo,Hang Yu,Wenjin Song,Jinhui Wang,Xianxian Shi,Peitao Xiao,Di Lu
Electrospun poly (vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) fibrous separators with controlled crystalline orientation were successfully developed for lithium metal batteries (LMBs). The electrospun separator exhibits a well-aligned fibrous network and predominant β-phase crystallization, demonstrating significantly enhanced ionic conductivity (0.63 mS cm −1 ) and superior electrolyte wettability compared to conventional NIPS-derived separators. The unique architecture enables homogeneous lithium deposition and extends cycling stability to 700 h in Li||Li cells, while maintaining excellent rate capability with 136.3 mAh g −1 at 2C in L cells. This work provides valuable insights into designing advanced polymer separators through microstructure and crystalline phase control for high-performance energy storage applications.
研究领域:
材料科学
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电化学
·
能源存储
·
高分子物理
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纳米纤维技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Penghao Hu,Lili Yan,Chaoxian Zhao,Yangyang Zhang,Jin Niu
PVDF-based nanocomposite films are promising in fabrication flexible piezoelectric nanogenerators for self-powered portable devices. In this work, a double-layered heterostructure was designed and the PVDF nanocomposite films contained with barium titanate nanoparticles were prepared by solution spin coating . The nanofillers were concentrated distributed in one layer of half the film, and the remaining half was neat PVDF layer. The double-layered BT/PVDF films were characterized comparatively with their counterpart of single-layer films. Although containing with less content of BT nanoparticles and lower proportion of β-phase in polymer, the piezoelectric nanogenerator (PENG) devices fabricated by double-layered films represent higher piezoelectric outputs in mechanical-to-electric conversion measurement. The charges accumulated at the additional interlayer interface between BT/PVDF layer and PVDF layer contributes much to enhancing electric capacity of the film. Benefited from good interfacial adhesion and better flexibility, the mechanical property and cyclic endurance are also improved. The double-layer film contained with 20 vol fractions (vol%) BTNPs represent excellent comprehensive performance of 6.7 V in output voltage, 2.4 μA in output current, and good stability changed within 3% in more than one thousand circles. The double-layer constructure is promising in nanocomposite films to develop PENGs for self-powered devices.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
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2024
·
IF 1.2
Tiansheng Gao,Wenzhong Ma,Xiangyuan Song,Jing Zhong,Haicun Yang,Hideto Matsuyama
The application of carbon nanotubes (CNTs) in water treatment membranes can increase the permeability and selectivity of the membranes. However, traditional CNTs are usually affected by van der Waals forces, which makes them prone to agglomerate in polymer membranes, and their non-directional arrangement in the membranes limits their transport efficiency as water channels in the membranes. In this paper, a reversible addition-fragmentation chain transfer (RAFT) polymerization method was used to synthesize propargyl methacrylate - random copolymerization - poly (ethylene glycol) methacrylate - block - polymethyl methacrylate [P(PgMA-r-PEGMA) -b-PMMA]. The P(PgMA-r-PEGMA)-b-PMMA grafting rate was 60.4% on the surface of magnetic sulfhydryl functionalized carbon nanotubes (mCNTs-SH) by click-reaction grafting. Poly (vinylidene fluoride) (PVDF)/CNTs composite ultrafiltration membranes were prepared using vapor-induced phase separation (VIPS) combined with magnetic field arraying. When the mCNTs-g-P(PgMA-r-PEGMA)-b-PMMA were vertically aligned in the PVDF membrane through a magnetic field, the effective construction of the vertical nanochannels was realized, and an increased purified water flux from 25.6 LMH to 35.8 LMH, with the composite ultrafiltration membranes was obtained. In addition, the membranes also showed excellent hydrophilicity, mechanical properties, and polyethylene glycol 1200 (PEG1200) rejection. The water contact angle was reduced from 105° to 79°, the rejection of PEG1200 was increased from 44% to 91% of the 0.5 g/L PEG aqueous solutions, and excellent mechanical properties (tensile strengthes up to 9.3 MPa) were achieved. By designing the interface structure of the CNTs and studying the orientation of the CNTs in PVDF membranes, this work provides a new research idea for the field of water treatment ultrafiltration membranes.
研究领域:
材料科学
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化学工程
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高分子科学
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纳米技术
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环境工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Zhongxu Li,Shengzhao Zhang,Zhao Jiang,Dan Cai,Changdong Gu,Jiangping Tu
A novel cheap eutectogel (ETG) membrane based on the deep eutectic solvent (DES) immobilized poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) is proposed as a solid electrolyte for safe lithium metal batteries in this study. The composition of DES is optimized, which is prepared by mixing the N-methylacetamide (NMAC) and the lithium bis [(trifluoromethyl)sulfonyl]imid (LiTFSI) with a molar ratio of 4:1. The eutectogel is formed by incorporating 70 wt% DES into the PVDF-HFP, which is non-flammable and shows excellent mechanical properties. This ETG membrane electrolyte with a thickness about 25 μm possess a high ionic conductivity (3.05 × 10 −4 S cm −1 ) at room temperature and a wide electrochemical stability window (~5 V). The Li//ETG//LiFePO 4 full cells deliver an acceptable discharge capacity of ~133.9 mAh g −1 at 0.1C and room temperature after 100 charge-discharge cycles. The ETG membrane electrolyte can also endow the Li//ETG//LiFePO 4 pouch cell with flexibility and withstanding abuse operations, like nail penetration and cutting. We expect that the flexible and non-flammable eutectogel membrane will have implications for the use of DES based ionic liquids in the synthesis of advanced solid-state electrolytes for safer lithium batteries .
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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高分子物理
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电池技术
✓ 已验证
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 8
·965
·
IF 2.8
Wei Zhang,Xuran Zhu,Baoan Li,Boyang Hu,Leyu Shen,Yanzong Meng,Haifeng Gao
Commercial hydrophobic membranes encounter severe problems such as membrane wetting and membrane fouling under extreme conditions, which affect membrane separation performance. To enhance the anti-fouling abilities of hydrophobic membranes, a composite membrane with omniphobic characteristics was fabricated successfully in this paper. Titanium dioxide (TiO2) nanoparticles were in-situ grown via the hydrothermal synthesis method, and then fluorosilane with low surface energy was grafted on polyvinylidene fluoride (PVDF) membranes. Subsequently, the morphologies, chemical compositions, wetting properties and structural parameters of composite membranes were characterized systematically. Various contaminants were added to the feed to investigate the anti-fouling and anti-wetting performances of the composite membrane in membrane distillation tests. The results showed that butyl titanate was first hydrolyzed to form titanium hydroxide (Ti(OH)4) and then it was dehydrated to form TiO2in the hydrothermal environment. TiO2crystals continued to grow and formed rough morphology with micro-nano synergistic distribution, which is similar to a “sunflower” disk composed of cubic clusters and nanopillars. Meanwhile, fluorosilane successfully was grafted onto TiO2. The contact angles of deionized water, 0.4 mM sodium dodecyl sulfate (SDS) solution and 0.2%v/vmineral oil emulsion on the composite membrane surface were 167.3°, 162.0° and 158.5°, respectively, endowing the composite membrane with excellent omniphobic features. In direct contact membrane distillation (DCMD) tests, the composite membrane exhibited a relatively stable membrane permeate flux, and the salt rejection rate almost reached 100%. The mixture, consisting of inorganic salts, organic substances, surfactants and oil emulsions, was used as feed. In contrast, the commercial PVDF membrane flux decreased drastically and even dropped to 0 due to the membrane fouling and wetting. As for the pristine PVDF membrane, the membrane surface was covered with pollutants and membrane pores were blocked. Therefore, it was proved that the omniphobic composite membrane possesses outstanding anti-fouling and anti-wetting performance.
研究领域:
膜科学
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材料工程
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表面化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Bo Sun,Xiaona Pan,Yu Tian,Wenlong Bi,Menglin Feng,Fenwu Liu,Qingjie Hou
Microbial fuel cells (MFCs) represent a promising clean energy technology with significant application potential. However, their implementation is constrained by the limitations of current membrane materials. Polyvinylidene fluoride-hexafluoropropylene (PVDF-co-HFP) is a material that has garnered interest in the field of electrochemical systems because of its facile moldability into various shapes and sizes of membranes, positioning it as a highly promising alternative to high-cost commercial membranes. Nevertheless, enhancing its electrochemical characterization remains a pivotal challenge to be surmounted for its broad adoption. In this study, an efficient PVDF-co-HFP membrane, augmented with PP13-TFSI ionic liquid and sulfonation (Membrane P-I&S), was successfully synthesized, and its potential as an ion exchange membrane in MFCs was evaluated. The findings indicated that chlorosulfonic acid considerably enhances the hydrophilicity and proton transport properties of PVDF-co-HFP, with the ionic liquid posited as an effective means to augment the sulfonation effect. An MFCs incorporating Membrane P-I&S demonstrated a remarkable current production capacity and power density, exceeding those of the unmodified membrane by more than two and threefold, respectively. In addition, the MFCs based on Membrane P-I&S displayed prolonged cycling stability with a notably porous architecture and enhanced biofouling resistance. This study validates the development of a high-efficiency, cost-effective, and environmentally friendly membrane fabrication approach for application in bioelectrochemical systems. This will help promote the application of MFCs in the field of wastewater treatment and resource recovery.
研究领域:
环境科学
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生物电化学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zhao-Lei Huo,Jia-Yu Qiao,Le-Xi Zhang,Yao-Wen Yue,Qi-Da Qiu,Zhi-Jiang Hou,Jing Yin,Li-Jian Bie
Nowadays, attractive progress has been made on flexible humidity sensors for multifunctional applications, yet most of them still suffer from intrinsic instability due to the device structure based on flexible substrates. Herein, high-performance flexible humidity sensors were constructed using alkali metal halide doped polyvinylpyrrolidone (PVP)/polyvinylidene fluoride (PVDF) freestanding films. These films are prepared via a versatile thermally induced phase separation procedure with a network-like porous structure. After doping with metal salts of MCl (M = Li, Na, K), the humidity sensing performance is highly improved, among which the LiCl@PVP/PVDF film is the optimized one. In the relative humidity range of 11–97% at room temperature, the LiCl@PVP/PVDF sensor exhibits high response (2.3 × 103), fast response (10 s), small hysteresis (0.41%), and excellent repeatability. Notably, the LiCl@PVP/PVDF film is featured as fully self-supporting without the assistance of any substrate, readily tailorable that can be cut into different shapes, as well as highly flexible that can be bent to certain angles, and meanwhile almost maintains its response without significant decrease. Furthermore, the excellent performance enables the LiCl@PVP/PVDF sensor to demonstrate great potential in real-time noncontact diaper and finger detection. This contribution provides a practical humidity sensing candidate for moisture monitoring and gives insights into the fields of humidity sensors and flexible electronics.
研究领域:
材料科学
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传感器技术
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 4
·929-935
·
IF 2.119
Li Weibiao,Li Xiaozhe,Xie Xiaohua,Yuan Anbao,Xia Baojia
A thin composite separator with polyethylene terephthalate nonwoven membrane as the structural support and polyvinylidene fluoride-hexafluoropropylene as the coating layer for lithium-ion batteries was prepared by a simple dip-coating process. The effect of different drying temperatures on the performance of the composite separator was investigated. The results indicate that 80 °C is the optimal drying temperature, preventing leakage current problems and providing a well-developed porous structure. The drying of the composite separator at 80 °C provides a superior thermal stability, better wettability with electrolyte, higher electrolyte uptake, and ionic conductivity compared to commercially available polypropylene (PP) separator. Furthermore, the electrochemical performance consisting of electrochemical stability, self-discharge, cycle performance, rate performance of the composite separator, and PP were determined. The drying of the composite separator at 80 °C shows almost the same oxidation stability and self-discharge performance, but a better cycling and rate performance than the PP separator.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子材料
·
电池技术
✓ 已验证
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 18
·2300650
·
IF 15.1
You Xue,Tao Yang,Yapeng Zheng,Kang Wang,Enhui Wang,Hongyang Wang,Laipan Zhu,Zhentao Du,Hailong Wang,Kuo-Chih Chou,Xinmei Hou
Piezoelectric nanogenerator (PENG) for practical application is constrained by low output and difficult polarization. In this work, a kind of flexible PENG with high output and self-polarization is fabricated by constructing CsPbBr 3 –Ti 3 C 2 T x heterojunctions in PVDF fiber. The polarized charges rapidly migrate to the electrodes from the Ti 3 C 2 T x nanosheets by forming heterojunctions, achieving the maximum utilization of polarized charges and leading to enhanced piezoelectric output macroscopically. Optimally, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits an excellent voltage output of 160 V under self-polarization conditions, which is higher than other self-polarized PENG previously. Further, the working principle and self-polarization mechanism are uncovered by calculating the interfacial charge and electric field using first-principles calculation. In addition, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits better water and thermal stability attributed to the protection of PVDF. It is also evaluated in practice by harvesting the energy from human palm taps and successfully lighting up 150 LEDs and an electronic watch. This work presents a new idea of design for high-performance self-polarization PENG.
研究领域:
材料科学
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纳米技术
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能量收集
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
·
IF 8
Xianhua Liu,Miao Liu,Yexin Dai,Jinran Cui,Asad Jamil,Wanxin Liu,Jiaxuan Li,Jiao Wang
Constructing a photocatalytic membrane and photo-Fenton reaction coupling system is a novel strategy to enhance the photocatalytic activity of the membrane and eliminate the problem of membrane contamination. Herein, a g-C 3 N 4 /Bi 2 MoO 6 /PVDF photocatalytic membrane was prepared using a tannic acid-assisted in-situ deposition method. The membrane was characterized by three advantages of photocatalytic, self-cleaning, and antibacterial properties. Under the photo-Fenton-like conditions, the membrane had superior photodegradation efficiency of 90.7% for tetracycline, one of the main antibiotic contaminants in the China's aquatic system. Moreover, the membrane had excellent photo-Fenton self-cleaning ability, its flux recovery rate was up to 96%–98% after the self-cleaning process. Photoluminescence spectra, diffuse UV–visible spectrum, transient photocurrent responses, and electrochemical AC impedance spectrum results show that the heterojunction structure formed by g-C 3 N 4 and Bi 2 MoO 6 could improve the separation efficiency of photogenerated electrons-hole pairs. Electron spin resonance spectroscopy confirmed the photo-electrons facilitated the formation of hydroxyl radical (·OH) in the existence of H 2 O 2 , which enhanced tetracycline degradation. Moreover, the superior photo-Fenton self-cleaning performance, which mainly relied on the active free radicals produced by the photo-Fenton-like membrane to remove dirt on the membrane surface or in the membrane pore channel. Our results may shed new light on the development of promising photocatalytic membrane systems by coupling with photo-Fenton-like processes, and facilitate their applications for wastewater treatment .
研究领域:
环境科学
·
材料科学
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Yahui Shi,Jinhui Huang,Guangming Zeng,Wenjian Cheng,Jianglin Hu,Lixiu Shi,Kaixin Yi
Photocatalytic membranes (PMs), coupling of membrane filtration and photocatalysis , have exhibited the potential for application in the wastewater treatment . In this study, we firstly adopted the supramolecular aggregates of melamine (M), cyanuric acid (C), and urea (U) in specific dimethyl sulfoxide (DMSO) as precursors to prepare carbon nitride MCU-C 3 N 4 with high photocatalytic performance, and a kind of novel-designed photocatalytic membrane was prepared via filtrating the mixture of graphene oxide (GO) nanosheets and MCU-C 3 N 4 on PVDF membrane supports, and then crosslinked using glutaraldehyde (GA) to construct a steady coating on the GO/MCU-C 3 N 4 /PVDF membrane. GO/MCU-C 3 N 4 /PVDF composite membrane exhibited higher permeation flux than that of GO/PVDF membrane and exhibited excellent separation performance for oil-in-water emulsion. A visible light-driven self-cleaning four-stage filtration by a self-built dead-end filtration system was carried out to evaluate membrane antifouling property, and GO/MCU-C 3 N 4 /PVDF membrane (M2) possessed higher flux recovery ratio (FRR) (∼92.36%) and lower irreversible fouling resistance (R ir ) ratio (∼8%) under 30min visible-light irradiation, maintaining relatively higher FRR (>72%) during 4 cycling of four-stage filtrating experiments. GO/MCU-C 3 N 4 /PVDF PMs are equipped with high permeation flux, separation performance, anti-fouling property and stability, indicating potential application in water treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qian Wang,Xinglin Li,Shasha Guo,Hengyang Mao,Xiaoshan Meng,Taoli Huhe,Zhengzhong Zhou
Industrial wastewater is complex, containing a significant amount of heavy metals and organics, which needs complicated traditional treatment processes. Ultrafiltration (UF) membranes process can remove various organic pollutants, but exhibit no removal capacity for heavy metal. In this work, we directly blended tannic acid (TA) with polyvinylidene fluoride (PVDF) to fabricate membranes, based on the chelating ability. TA not only improves heavy metal adsorption properties to the membrane but also enhances its acid resistance. The PVDF/TA membrane maintained over 99 % remove rate to Fe 3+ in five adsorption–desorption tests and also exhibited effective rejection of bovine serum albumin after the cycling test. The PVDF/TA membrane achieved efficient treating processing of oil and Fe 3+ mixed solutions, with 100 % rejection for oil and over 99 % for Fe 3+ . In this study, the PVDF/TA membranes presented tremendous potential for application in complex wastewater treatment.
研究领域:
环境工程
·
材料科学
·
水处理
✓ 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）