RSC Advances
·
2016
·Vol. 6
·期 72
·68371-68378
·
IF 3.289
Zhen Liu,Shaojie Han,Chong Xu,Yuwen Luo,Na Peng,Chenyang Qin,Mingjiong Zhou,Wenqin Wang,Liwei Chen,Shigeto Okada
A novel polymer binder, synthesized via in situ thermal cross-linking of water-soluble polyvinyl alcohol (PVA) and poly(ethylene imine) (PEI) precursor, is applied as a functional network binder to enhance the electrochemical performance of a silicon anode. The Si anode with PVA–PEI binder exhibits high specific capacity (3072.9 mA h g−1) in the initial cycle, high initial coulombic efficiency of 83.8% and excellent long-term cycling stability (1063.1 mA h g−1 after 300 cycles). Furthermore, the Si anode containing PVA–PEI binder also exhibits excellent rate performance, reaching a high specific capacity of 1590 mA h g−1 even at high current density of 10 A g−1. These outstanding electrochemical properties are ascribed to the reversibly-deformable polymer network and the binder's strong adhesion to the silicon particles. This low-cost and eco-friendly polymer binder has great potential to be used for silicon anodes in next generation Li-ion batteries.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 3
·2314-2322
·
IF 3.006
Chen Ying,Cao Jilin,Wei Hengyong,Wu Zhengang,Wei Yingna,Wang Xuepei,Pei Yuan
Silver nanoparticles (Ag NPs) were decorated on the electrospun polyvinyl alcohol (PVA)/polyethyleneimine (PEI) nanofibers by electrostatic adsorption in order to prepare Ag@PVA/PEI SERS substrate. The morphology and chemical structure analysis show that the metal Ag NPs are decorated on the PVA/PEI nanofibers surface uniformly. The lowest distinguishable level of Rhodamine 6G (R6G) is 10 −6 M of Ag@PVA/PEI nanofibers SERS substrate. It exhibits remarkable enhancement effect (EF = 1.4 × 10 5 ), good reproducibility (RSD = 9.5%). By the investigations of Raman spectra analysis, the Ag@PVA/PEI nanofibers substrate presented high sensitivity in the detection of enrofloxacin. Therefore, it facilitates a simple, direct, in-situ method for enrofloxacin residue detection on an irregular prawn surface. Graphical abstract
研究领域:
材料科学
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分析化学
·
环境科学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 20
·2451-2461
·
IF 3.4
Jingda Huang,Shite Lin,Yipeng Liang,Enfu Wang,Yu Miao,Wenbiao Zhang,Kuichuan Sheng
It is still a serious challenge to construct a water-soluble polymer-based air filtration membrane with high efficiency and good mechanical properties by electrospinning. In the study, using polyvinyl alcohol (PVA) and polyacetylimide (PEI) as the main materials, both nanocellulosic crystal (CNC) and zinc oxide (ZnO) as the synergistic reinforcers and methyltrimethoxysilane (MTMS) as the hydrophobic modifier, the electrospun PVA/PEI/CNC/ZnO composite nanofibrous membrane with dual air filtration mechanisms was established. One of the mechanisms was the interception of the three-dimensional network structure built by the composite nanofibrous membrane, the other was the electrostatic adsorption provided by CNC. Based on the dual air filtration mechanisms, the filtration efficiency of particulate matter 2.5 (PM2.5) reached 98.20%. Moreover, the composite nanofibrous membrane displayed a good thermal stability and could still maintain more than the filtration efficiency of 83% and low-pressure drop after treatment at 200 °C for 1 h. Moreover, the composite nanofibrous membrane could still maintain the filtration efficiency (97.3%) and low-pressure drop (110.7 Pa) after five washing cycles after filtration, reflecting good reusability. Interestingly, the PVA/PEI/CNC/ZnO composite nanofibrous membrane was simple to produce and demonstrated excellent filtration efficiency, as well as excellent thermal stability, which could be an effective barrier against PM2.5 invasion. Graphical
研究领域:
材料科学
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环境科学
·
纳米技术
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产品关联
DOI
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 2
·794-804
·
IF 2.562
Han Zhu,Ming Zhang,ShengYing Cai,YingTing Cai,Pan Wang,ShiYong Bao,MeiLing Zou,MingLiang Du
A facile approach for the synthesis of uniform, small size and well-dispersed rhodium nanoparticles (RhNPs) on cross-linked polyvinyl alcohol–polyethyleneimine (PVA–PEI) nanofibers has been demonstrated. Various methods were firstly employed to cross-link PVA nanofibers and the cross-linked PVA–PEI nanofibers exhibited good water stability and porous structures after immersing in water for 72 h. Because of the strong chelate effects among the amine groups, hydroxyl groups and Rh3+ ions, uniform RhNPs with an average diameter of about 2.5 ± 0.2 nm can evenly and densely grow throughout the PVA–PEI nanofibers via an in situ reduction. Meanwhile, the better dispersion and smaller size of the RhNPs grown on the nanofibers in comparison with the pre-synthesized RhNPs directly deposited on the nanofibers exhibit the advantages of in situ reduction for size and dispersion control. The successful fabrication of the RhNPs/(PVA–PEI) nanofibers with various densities of well-dispersed RhNPs demonstrates that the strong chelate effects and stabilization of the PVA–PEI nanofibers also play an essential role in the size and dispersion control of RhNPs. The crystal structures, chemical bonding and interactions of the prepared nanofibers were verified using XPS and FTIR spectra and XRD patterns. These novel nanomaterials were fabricated as non-enzymatic electrochemical sensors and exhibit highly electrocatalytic activity towards H2O2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2013
·Vol. 46
·期 34
·345303
·
IF 2.528
Pan Wang,Han Zhu,Shiyong Bao,MingLiang Du,Ming Zhang
Two strategies are demonstrated to fabricate AgNPs/PVA and AgNPs/(PVA/PEI) nanofibre hybrids. In the first approach, we synthesized AgNPs in poly(vinylalcohol) (PVA) solution and then electrospun the AgNPs/PVA solution into the AgNPs/PVA nanofibres. In the other one, the polyethylenimine (PEI) was introduced to improve the water-stability of PVA and then the AgNPs were immobilized on electrospun PVA/PEI nanofibres to fabricate the AgNPs/(PVA/PEI) nanofibres. Field-emission scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectroscopy and x-ray photoelectron spectroscopy (XPS) were utilized to investigate the morphology and the growth mechanism of the hybrids. The investigations demonstrate that both of the obtained AgNPs/PVA hybrids and AgNPs/(PVA/PEI) hybrids exhibit good water-stability and good antibacterial activity against E. coli and S. aureus.
研究领域:
材料科学
·
微生物学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 12
·1-15
·
IF 2.6
Wang Ziyu,Shi Gege,He Yanyang,Wu Ranran,Hu Yufang,Wang Sui,Mao Jie
Annealing is a heat treatment process for materials. In this study, a conductive hydrogel was synthesized by a one-pot method using three raw materials: polyvinyl alcohol(PVA), carboxylated carbon nanotubes(Multi-Walled Carbon Nanotubes-COOH, MWCNTs-COOH) and polyethyleneimine (PEI). Based on the traditional freeze-thaw method for the preparation of PVA-based hydrogels, the annealing treatment was further added here to enhance the mechanical properties and fatigue resistance of the hydrogels. The synthesized conductive hydrogels were annealed in oven at different temperatures for a certain time, and the optimized experimental conditions and results were: the mechanical properties of the conductive hydrogel were best improved under the condition of 100 ℃-20 min, with the ultimate stress of 30.8 MPa and toughness as high as 779.58 MJ/m 3 . A high-strength, fatigue-resistant conductive hydrogel was successfully prepared, and its mechanical properties far exceeded those of other conductive hydrogels. Through a series of tests such as X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), it was found that annealing promotes the orderly arrangement of PVA chains and crystallization through high temperatures, so as to enhance the mechanical properties of hydrogels. As a relatively simple and inexpensive annealing post-treatment technique, it is expected to be more widely used in improving the mechanical properties of hydrogels.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 8
·1955
·
IF 3.623
Chan Wang,Kuan Hu,Ying Liu,Ming-Rong Zhang,Zhiwei Wang,Zhou Li
All-solid-state supercapacitors have gained increasing attention as wearable energy storage devices, partially due to their flexible, safe, and lightweight natures. However, their electrochemical performances are largely hampered by the low flexibility and durability of current polyvinyl alcohol (PVA) based electrolytes. Herein, a novel polyvinyl alcohol-polyethyleneimine (PVA-PEI) based, conductive and elastic hydrogel was devised as an all-in-one electrolyte platform for wearable supercapacitor (WSC). For proof-of-concept, we assembled all-solid-state supercapacitors based on boron nitride nanosheets (BNNS) intercalated graphene electrodes and PVA-PEI based gel electrolyte. Furthermore, by varying the electrolyte ions, we observed synergistic effects between the hydrogel and the electrode materials when KOH was used as electrolyte ions, as the Graphene/BNNS@PVA-PEI-KOH WSCs exhibited a significantly improved areal capacitance of 0.35 F/cm2and a smaller ESR of 6.02 ohm/cm2. Moreover, due to the high flexibility and durability of the PVA-PEI hydrogel electrolyte, the developed WSCs behave excellent flexibility and cycling stability under different bending states and after 5000 cycles. Therefore, the conductive, yet elastic, PVA-PEI hydrogel represents an attractive electrolyte platform for WSC, and the Graphene/BNNS@PVA-PEI-KOH WSCs shows broad potentials in powering wearable electronic devices.Keywords:hydrogel electrolyte;flexible supercapacitor;graphene;boron nitride nanosheets
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 4
·1-12
·
IF 2.7
Huang Jingda,Wang Yi,Cai Yuxin,Liang Yipeng,Lin Shite,Wang Enfu,Zhong Jinhuan,Zhang Wenbiao,Sheng Kuichuan
It is still a challenge to prepare a water- and polymer-based electrospun air filter film with high efficiency filtration, low pressure drop, and good mechanical properties. To address this issue, polyvinyl alcohol (PVA) was employed as the main material, mixing polyethyleneimine (PEI), bamboo-based activated carbon (BAC) and cellulose nanocrystal (CNC) to construct the air filter film by electrostatic electrospinning. In this system, the negatively charged BAC and CNC are fixed in the system through bonding with the positively charged PEI, showing a double adsorption effect. One is the mechanical filtration of the porous network structure constructed by PVA@PEI electrospun nanofibers, and the other is the electrostatic adsorption of PM2.5 on the surface of BAC and CNC. It is significant that the resulting composite air filter displays a high filtration efficiency of 95.86%, a pressure drop of only 59 Pa, and good thermal stability. Moreover, the introduced methyltrimethoxysilane (MTMS) endows it with good water-resistance. Given these excellent performances, this system can provide theoretical and technical references for the development of water- and polymer-based electrospun air filter film.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujiao Zou,Chenyu Li,Ni Li,Yili Zhao
Silver nanoparticles (Ag NPs)-based nanomaterials are effective catalysts for a wide range of reactions. The recyclability and efficient catalytic properties of Ag-based nanocatalysts have been the focus of significant research interest. Herein, to address these challenges, we incorporated Fe 3 O 4 nanoparticles (NPs) into a polyvinyl alcohol/polyethyleneimine (PVA/PEI) solution to fabricate PVA/PEI@Fe 3 O 4 nanofibrous mats via electrospinning. Subsequently, the magnetic nanofibrous mats were homogenized to produce short magnetic nanofibers, which can be easily separated from the solution using a magnet. These short PVA/PEI@Fe 3 O 4 nanofibers were then immersed in an aqueous solution of AgNO 3 to adsorb and reduce Ag ions, resulting in the formation of Ag NPs with an average diameter of approximately 15 nm, uniformly dispersed on the nanofiber surface. The resulting short PVA/PEI@Fe 3 O 4 /Ag nanofibers exhibit excellent catalytic activity for the reduction of 4-NP, achieving a high conversion rate of 97.0 %. Furthermore, they demonstrated remarkable recyclability, maintaining high catalytic activity throughout six consecutive cycles. The short magnetic nanofibers proposed in this study are anticipated to facilitate the practical application of electrospun nanofibers in the catalytic removal of pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Hai-Xin Du,Min-Qi Wang,Zhou-Rui Wang,Fei-Peng Du,Sheng-Gao Wang,Zhe Chen,Ping Fu
Moisture-electric generation (MEG) hydrogels are emerging as a promising candidate for lightweight self-powered electronics by scavenging energy from atmospheric water vapor. Nevertheless, the simultaneous optimization of mechanical durability and electrical output performance remains a critical bottleneck for their practical applications. Herein, a porous poly(vinyl alcohol)/polyethylenimine/lithium chloride (PVA/PEI/LiCl) composite hydrogel is fabricated through a facile freeze–thaw strategy. The PEI-tailored three-dimensional porous structure boosts moisture adsorption and ion transport efficiency, while the dense hydrogen-bond network between PVA and PEI endows the hydrogel with superior structural stability and tensile flexibility. Moreover, the synergistic effect of PEI-induced electric double-layer behavior and LiCl-based ionic system substantially enhances ionic conduction and moisture-electric conversion capability. The optimized composite hydrogel achieves a tensile strength of 4.32 MPa and a breaking elongation of 473 %. Under 99 % relative humidity, the hydrogel exhibits a water uptake capacity of 149 % within 12 h and a high ionic conductivity of 1.19 S m −1 . The assembled MEG device yields an open-circuit voltage of ∼ 1.0 V, a short-circuit current of 713 μA, and a peak power density of 104 μW·cm −2 , alongside long-term operational stability for over 5 h without obvious performance attenuation. Furthermore, series-connected MEG devices can steadily drive commercial LEDs and digital watch. This work proposes a synergistic structural and ionic regulation strategy to synchronously improve the mechanical robustness and moisture-electric performance of hydrogels, providing a feasible avenue for the design of high-performance MEG materials and advanced self-powered electronic systems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 4
·140
·
IF 3.5
Wang Ziyu,Wu Ranran,He Yanyang,Hu Yufang,Wang Sui,Mao Jie
Addressing the critical challenge of balancing mechanical robustness and electrical conductivity in hydrogels for wearable sensors, this study proposes a synergistic processing strategy that integrates freeze-thaw cycling, thermal annealing, and the Hofmeister effect-induced salting. A ternary composite hydrogel was prepared with polyvinyl alcohol (PVA) as the matrix, polyethyleneimine (PEI) to enhance crosslinking and biocompatibility, and carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) to improve conductivity. The optimized freeze-thawing-annealing (100 °C, 20 min) and salting-out (1.5 M NaCl) process resulted in a densely cross-linked network featuring significantly enhanced crystallinity and a homogeneous, pore-free microstructure. This hierarchical structure confers upon the hydrogel outstanding mechanical properties: tensile strength of 4.15 MPa, toughness of 17.73 MJ/m 3 , elastic modulus of 2.84 MPa, and a high fatigue threshold of 117.4 J/m 2 . Simultaneously, the electrical conductivity of the hydrogel reached 0.449 S/m. The hydrogel demonstrated excellent strain/pressure sensing capabilities, featuring tunable gauge factors (GF = 0.87–2.12 within the 0-100% strain range) and pressure sensitivity (0.145 kPa -1 below 2 kPa). The practical applicability of the hydrogel was verified by reliably monitoring various human motions in real-time. This research offers a scalable and effective material design strategy for next-generation flexible electronics.
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Yujiao Zou,Bo Ge,Yanhui Hu,Yulu Yang,Ni Li,Yili Zhao
The high catalytic performance induced by the photothermal conversion effect holds immense potential in environmental purification, attracting widespread attention. Herein, the synthesis of PVA/PEI/Au nanofibers was successfully achieved, and they were applied as plasmonic photothermal catalysts to facilitate the reduction of 4-nitrophenol (4-NP). The photothermal performance of nanofibers loaded with different concentrations of Au nanostars (NSs) was compared under near-infrared (NIR) laser irradiation. Remarkably, at low laser power densities under NIR irradiation, the PVA/PEI/Au nanofibers catalyzed the reduction of 4-NP, resulting in a 1.5-fold increase in reaction rate and achieving a 98% conversion efficiency within 8 min. Additionally, the nanofibers demonstrated excellent recyclability, maintaining a conversion efficiency exceeding 97% over six consecutive cycles. The PVA/PEI/Au nanofibers hold significant promise for the practical application of electrospun nanofibers in the photothermal degradation of environmental pollutants.
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产品关联
DOI
高影响因子
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