SYNTHETIC METALS
·
2018
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IF 2.526
Shuo Yang,Xuan Li,Huijun Li,Pei Yao
A polypyrrole/montmorillonite-polyvinylidenedifluoride/polymethyl methacrylate (PPy/MMT-PVDF/PMMA) composite film was prepared by a solvent casting technique. The surface morphology and cross-sectional structure of the 12 wt.% PPy/MMT-PVDF/PMMA composite film exhibited porosity with high specific surface area and good adsorption capacity. The 12 wt.% PPy/MMT-PVDF/PMMA composite film shows good electrolyte uptake (241%) and electrochemical stability. The ionic conductivity of the 12 wt.% PPy/MMT-PVDF/PMMA composite film with LiPF 6 organic electrolyte reaches 2.45 × 10 −3 S cm −1 at 20 °C. The Li/LiNi 1/3 Co 1/3 Mn 1/3 O 2 cell assembled with the 12 wt.% PPy/MMT-PVDF/PMMA composite film and LiPF 6 organic electrolyte exhibits good capacity retention and cycling performance at 1 C and 60 °C. At the same time, the nucleophilic substitution reacts with the PPy/MMT-PVDF/PMMA composite film and HF from hydrolysis by trace moisture of LiPF 6 in the electrolyte solution, which can inhibit the disproportionation of Mn 3+ in the LiNi 1/3 Co 1/3 Mn 1/3 O 2 electrode material and decrease the internal resistance of the cell at high temperature. In conclusion, the PPy/MMT-PVDF/PMMA composite film can be employed in Li-ion batteries.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 2
·022504
·
IF 4.316
Shahid Khan,Chaoyan Fang,Yecheng Ma,Mahmood ul Haq,Mohammad Nisar,Gang Xu,Yong Liu,Gaorong Han
The aim of the study was to determine the effect of inorganic core-shell SiO2 nanoparticles modified with polymethyl methacrylate (PMMA) layer, on the optical and electrochemical properties of poly vinylidenefluoride-co-hexafluoropropylene (PVDF-HFP) gel polymer electrolyte (GPE). The core-shell SiO2 nanoparticles were first modified with PMMA to improve its dispersibility and compatibility in the polymer matrix. The morphology and structural properties of the core-shell SiO2 nanoparticles before and after modification were characterized by XRD, FTIR and SEM analysis. Then the modified SiO2 nanoparticles were used to prepare the composite GPE, composed of chemically modified core-shell structured SiO2-PMMA and PVDF-HFP polymer matrix. The transformation of nano-silica to SiO2-PMMA nanoparticles shows the better compatibility of PMMA and PVDF-HFP that favours the silica to be well dispersed in the organic matrix and significantly improve the doping effect. Various concentrations of modified SiO2-PMMA were used to dope PVDF-HFP GPEs. The results indicate that the 10% doping shows the highest ionic conductivity i.e. 2.22 × 10−3 s cm−1. In addition, the composite GPEs show the high transmittance and good thermal stability; therefore it can add important insight into developing high-performance materials for electrochromic devices.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Mingming Cui,Hong Sun,Zhichao Xue,Qiang Li,Tianyu Zhang,Qunying Kang
Using gel polymer electrolytes (GPEs) instead of liquid electrolytes is a sensible and effective strategy for safety reasons. A GPE membrane was prepared by UV-curing using poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the polymer substrate material and an optimized ratio. The GPE membrane exhibited good flexibility and a higher ionic conductivity (σ = 0.63 mS cm–1). The RuO2@C/GPE/Li (abbreviated as S-GPE) battery is employed to demonstrate the electrochemical performance of GPE. The battery exhibits an Rct of 255.9 Ω, accompanied by a lack of cycle stability, with a cycle life of only 110 h. The results indicate that it is challenging to enhance the battery’s overall performance by solely improving the internal transfer performance of the electrolyte and ignoring the high interface impedance caused by the “solid–solid” contact at the electrolyte–electrode interface. Based on these findings, a straightforward one-step method is adopted to combine GPE with the air cathode by in situ photopolymerization and assemble it into RuO2@C-GPE/Li (abbreviated as I-GPE) battery used to demonstrate the electrochemical performance of the integrated GPE. The Rct value of the battery is 89.66 Ω, with a notable improvement in cycle stability. The battery’s cycle life is 940 h, which is 8.5 times that of the sandwich structure lithium–oxygen battery. The results indicate that preparing an integrated GPE by in situ photopolymerization of the electrolyte electrode is a straightforward and effective method to improve poor interfacial compatibility and can provide a theoretical basis for subsequent in-depth research.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Haoran Pei,Jingjing Jing,Yinghong Chen,Jiajun Guo,Ning Chen
The high-performance piezoelectric nanogenerator (PENG) with good flexibility, tunability and sensitivity is desirable for the next-generation of wearable electronics . However, the 3D printing of unique architectures and arbitrary shapes could endow the conformal electronic sensors with excellent flexibility and functionality. In this work, the self-poled PENG were successfully fabricated by incorporating the oriented ionic salt-montmorillonite (IS-MMT) co-fillers into poly (vinylidene fluoride) (PVDF) matrix and then performing 3D printing . This hence could give the 3D printed PENG the locked interfacial piezoelectric polarization. More importantly, the self-adaptive conformal PENG based on auxetic metamaterial has also been developed, which is beyond the practicability of the traditional 2D PENG. The effect of various architectures of the metamaterial on the mechanical and piezoelectric responses was particularly discussed. The tailoring of the 3D printed cell with metamaterial of serpentine geometries shows the appealing advantages of high sensitivity to structure variation, thus being beneficial for easier regulation of piezoelectric output. When mounted on the joints as a wearable healthcare monitoring device, this 3D printed PENG could accurately detect the movement of muscles, demonstrating its potential in motion tracking and sign-language interpretation. Obviously, this work could provide a new idea for design and fabrication of programmable wearable electronics.
研究领域:
材料科学
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纳米技术
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生物医学工程
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柔性电子
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Sainan Hu,Zhixiang Fu,Yongchao Chen,Chuyu Zhou,Zhengdong Fei
A novel polyvinylidene fluoride/bis(trimethoxysilylpropyl)amine (PVDF/BTMSPA) asymmetric composite membrane was fabricated through a one-step vapor-induced phase separation (VIPS) process. The hydrophilic BTMSPA monomers preferentially migrated to the membrane surface during VIPS, where they underwent hydrolysis and condensation to form a dense skin layer, while the hydrophobic PVDF matrix solidified into a porous support layer. By varying the VIPS duration, the skin layer structure could be tuned from porous to dense. At a VIPS time of 0.5 h, a spontaneously formed dense-skinned PVDF/BTMSPA composite membrane was achieved. The membrane demonstrated preferential adsorption of n-butanol over water, exhibiting optimal separation performance for a 4 wt% n-butanol/water mixture at 70 °C, with a flux of 1980 g/m 2 ·h and a separation factor of 63.65. This work not only provides a facile and efficient VIPS-based strategy for fabricating asymmetric composite membranes but also highlights the potential of PVDF/BTMSPA membranes for n-butanol/water separation applications.
研究领域:
材料科学
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分离技术
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 52
·34107-34116
·
IF 4.036
Chuanfeng Zang,Hao Chen,Xiangye Han,Wei Zhang,Junfang Wu,Fanghua Liang,Jiamu Dai,Hongchao Liu,Guangyu Zhang,Ke-Qin Zhang,Mingzheng Ge
PVDF/ZnO/CuS photocatalysts with ZnO/CuS heterojunctions were synthesized via electrospinning, hydrothermal, and ion-exchange techniques. As matrix materials, electrospun PVDF nanofibers are easy to be recycled and reused. ZnO nanorods anchored on PVDF nanofiber with high specific surface area provide abundant active reaction sites for photocatalysis. While the loaded CuS nanoparticles as a photosensitizer compensate the low quantum efficiency of ZnO and improve the visible-light photocatalytic efficiency. As a result, the PVDF/ZnO/CuS composited photocatalyst exhibits outstanding photocatalytic performance in exposure to UV and visible light owing to the suppressed recombination of electron–hole pairs and widened visible light absorption range. The kinetic constants of PVDF/ZnO/CuS nanocomposites under UV irradiation (9.01 × 10−3 min−1) and visible light (6.53 × 10−3 min−1) irradiation were 3.66 and 2.53 times higher than that of PVDF/ZnO (2.46 × 10−3 min−1 & 2.58 × 10−3 min−1), respectively. Furthermore, PVDF/ZnO/CuS nanocomposites demonstrate excellent robustness in terms of recycling and reuse, which is advantageous in practical applications.
研究领域:
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
·
2021
·
IF 7.312
Hengyang Mao,Shouyong Zhou,Shuo Shi,Ailian Xue,Meisheng Li,Jianjian Cai,Yijiang Zhao,Weihong Xing
Membrane technology can minimize spread of viruses in the environment during pandemics, however, its efficiency is highly limited by biofouling. In the current study, a composite membrane composed of commercial membrane material, poly(vinylidene fluoride) (PVDF), and thermo-responsive attapulgite (t-ATP) was developed. The t-ATP was synthesized by surface modification of attapulgite (ATP) nanofiber with poly( N -isopropylacrylamide) (PNIPAM). t-ATP acted as a nucleating seed to expedite crystallization of PVDF and as a hydrophilic modifier to enhance the wetting performance of membrane. The tensile strength, elongation, and permeance of membrane increased with increase in t-ATP content without compromising pore structure. PNIPAM chains in t-ATP were swollen or shrunken with the change in temperature, thus releasing adhesion between membrane and biofoulants. The modified membrane exhibited superior biofouling resistance performance compared with the pristine PVDF membrane owing to the hydrophilic property of t-ATP and the stretchable chains on its surface. Notably, 89% of biofouling on membrane surface was easily removed through a simple temperature-change coupling ultrasonic cleaning process. High performance of the PVDF/t-ATP membrane indicates its potential application for high-efficient biological wastewater treatment.
研究领域:
环境科学
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
Functional Materials Letters
·
2020
·
IF 2
Zhong Yang,Jing Wang,Long He,Chaoyong Deng,Kongjun Zhu
Flexible dielectric capacitors are becoming shining stars in modern electronic devices. Ceramic particles with large dielectric constants and benign compatibility are attractive candidates to enhance the energy storage density of pristine polymer capacitors while guaranteeing their flexibility. In this work, double-shell structure of Al 2 O 3 (AO) and dopamine (PDA) were successively coated on the Nd-doped BaTiO 3 (NBT) particles and then introduced into the Poly(vinylidene fluoride) (PVDF) matrix. Obvious enhancement in dielectric constants was observed while the dielectric loss remained nearly constant. For the composite films with 1–4 vol.% NBT@AO@PDA NPs, the maximum energy density of 9.1 J/cm 3 and energy efficiency of 65% was achieved at 430 MV/m in the sample with 1 vol.% filling ratio, which are 1.4 and 1.3 times larger than those of pristine PVDF at 450 MV/m. The finite element simulation reveals the effective relief of the electric field concentration in the composite film induced by the AO and PDA layers. The greater improvement in the energy storage performance could be anticipated if the dispersity of NBT@AO@PDA NPs was further improved.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 9
·2980-2990
·
IF 2.392
Wang Zhen-yu,Li Cong,Huang Ying-de,He Zhen-jiang,Yan Cheng,Mao Jing,Dai Ke-hua,Zheng Jun-chao
With increasing demand on energy density of lithium-ion battery, wide electrochemical window and safety performance are the crucial request for next generation electrolyte. Gel-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window problems. However, low ionic conductivity and poor physical performance prohibit its further application. Herein, a fast-ionic conductor (Li 2.64 (Sc 0.9 Ti 0.1 ) 2 (PO 4 ) 3 ) (LSTP) was added into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) base gel-electrolyte to enhance mechanical properties and ionic conductivity. Evidences reveal that LSTP was able to weaken interforce between polymer chains, which increased the ionic conductibility and decreased interface resistance during the cycling significantly. The obtained LiFePO 4 /hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity (145 mA·h/g at 1 C , 95 mA·h/g at 3 C , 28 °C) which presented a potential that can be comparable with commercialized liquid electrolyte system.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ling Ling,Min Xiao,Dongmei Han,Shan Ren,Shuanjin Wang,Yuezhong Meng
Porous composite membrane of polyvinylidene fluoride (PVDF)/sulfonic silica with high vanadium ions selectivity was fabricated for vanadium redox flow battery (VRFB) application. The porous PVDF membranes were first prepared as matrix via phase transfer method, followed by introducing sulfonic silica into the matrix via sol-gel process. The sulfonic silica filled in the pores can not only provide proton transfer carriers but also suppress the permeation of vanadium ions through the membrane. Moreover, the organic/inorganic composite can enhance the durability of the membrane. The morphologies of composite membranes (PVDF/SiO 2 –SO 3 H) were characterized by SEM technique. Finally, the fabricated composite membrane shows one order of magnitude lower vanadium ion permeability (1.12✕10 −7 cm 2 min −1 ) and 3 times higher ion selectivity compared with Nafion 115 at room temperature. The single cell assembled using the as-prepared composite membrane gives a Coulombic efficiency of 90.3% and an energy efficiency of 75.6% at a current density of 60 mA cm −2 , which is comparable with Nafion 115 (89.7% and 78.2%, respectively). This strategy could provide a simple way to design and fabricate an organic/inorganic composite membrane with high durability for the application in VRFBs.
研究领域:
材料科学
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电化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·3965-3981
·
IF 2.779
Ahmed Arsalan,Jia Yunming,Deb Hridam,Arain Muhammad Fahad,Memon Hafeezullah,Pasha Khalid,Huang Yi,Fan Qinguo,Shao Jianzhong
The use of piezoelectric materials has been increased due to the growing demand for wearable devices. Herein, we report the development of new copolymer poly (vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE)-based reduced graphene oxide (rGO) and multiwalled carbon nanotubes (MCNTs) loaded electrospun (E-Spun) nanofibers. The rGO-MCNTs loaded PVDF-TrFE nanofibrous mat led to the fabrication of ultra-sensitive piezoelectric pressure sensors for potential wearable health monitoring applications. The doped PVDF-TrFE solution of different weight percentages of rGO-MCNTs as fillers was prepared and used to fabricate an e-spun nanofibrous mat. Complete characterization of resultant materials were carried through diverse instruments which reveals the successful integration of rGO-MCNTs (3.2%) as a dopant that improved the β-phase up to 92%. The DSC analysis further exposes the high thermal stability of the PVDF-TrFE nanofibers mat due to the enhanced crystallinity with the addition of nanofillers. The newly developed sensor’s overall output (based on sensitivity) was calculated under a variable applied pressure range of 0.25 ~ 300 cN at 50 HZ. Results show that the pressure sensor response has improved from 16.125 ~ 0.430 kPa −1 , corresponding to a higher sensitivity under static and dynamic forces in the applied pressure range. These results are of a fundamental study and open new prospects for the hybrid nanofibrous mat as alternative electrode material in the piezoelectric pressure sensor.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Yijun Fu,Yue Cheng,Chi Chen,Dawei Li,Wei Zhang
The effect of hydrothermal process on the morphology and piezoelectric performance of zinc oxide/polyvinylidene fluoride (ZnO@PVDF) composite nanofibers is rarely studied. In this work, highly aligned ZnO nanorods were epitaxially grown on the electrospun PVDF nanofibers to form ZnO@PVDF composite nanofibers with a pine-needle-like bionic structure. Nanofibers before and after hydrothermal reaction were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and piezoelectric analysis. Results demonstrated that hydrothermal reaction conditions, including mass ratio of ZnCl 2 to HMTA, ammonium hydroxide volume, hydrothermal reaction time and temperature should be carefully controlled and cooperated with each other to produce ZnO nanorods with ideal microstructure and piezoelectric performance. FTIR and XRD results confirmed the transformation of β phase in PVDF nanofibers from α phase in PVDF powder due to the elongation under strong electric field during electrospinning. Results of SEM and XRD certified the successful growth of ZnO nanorods with hexagonal wurtzite structure, which plays an important role in facilitating the percentage of β phase and the resulted piezoelectric capacity of ZnO@PVDF composite nanofibers. All of these characterizations suggest that the proposed pine-needle-like ZnO@PVDF composite nanofibers demonstrate promising potential in the wide application of electromechanical energy conversion.
研究领域:
材料科学
·
纳米技术
·
物理学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）