Applied Nanoscience
·
2019
·Vol. 9
·期 8
·1991-2000
·
IF 3.198
Liu Zhi,Cao Rui,Wei Anfang,Zhao Jianghui,He Jihuan
Membrane fouling and poor flexibility plague membrane technology for further application in water treatment. Herein, we introduce a hierarchical superflexible/superhydrophilic poly (vinylidene fluoride-co-hexa-fluoropropylene) (PVDF-HFP)/CuO-nanosheet membrane, which is capable of separating Polystyrene (PS) microspheres (diameter large than 300 nm) with high separation efficiency (higher than 99.89%). Moreover, the resulting membrane maintained 98.10% water flux after 60 min, suggesting excellent anti-fouling property. The anti-fouling property is contributed by the membrane superhydrophilicity, a result of the extreme roughness of CuO-nanosheet and the hydrophilic nature of CuO. Furthermore, the membrane processes outstanding flexibility due to the PVDF-HFP nanofiber backbone, which widens its applicability in practical industrial employment. Therefore, such a membrane with anti-fouling, high separation efficiency, super flexibility, as well as acceptable water flux (2360 ± 50 Lm − 2 h − 1 , 0.3 bar) and good mechanical properties (stress at break 6.65 MPa and elongation at break 67.35%), makes the membrane a good candidate for practical water microfiltration.
研究领域:
材料科学
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环境工程
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水资源处理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jun-Heng Fu,Qigong Zhang,Minglei Yan,Wei Tang,Yun Zeng,Yuntao Cui,Mingkuan Zhang,Hongwei Deng,Hao Kang,Xinlong Sun,Liang Qiao,Hongzhang Wang,Yang Zhao
Passive radiative cooling which dissipates heat from surfaces by reflecting sunlight and emitting radiation towards outer space, has garnered growing attention as an eco-friendly cooling strategy with zero-energy consumption. However, few studies focus on low-cost and multifunctional composite film fabricated by a straightforward and environmentally friendly method that is crucial for their large-scale applications. Herein, we introduce a facile, efficient, and scalable approach to fabricate a hydrophobic and polymer-dielectric poly (vinylidene fluoride)-hexafluoropropylene (P(VDF-HFP)@PVA hydrogel Janus film (DPP), exhibiting exceptional radiative cooling and thermal management capabilities for diverse practical applications. With the introduction of ZnO, DPP showcases the optical capability with a solar reflectance of ≈93 % and an infrared emittance of ≈96 %, endowing it with remarkable radiative cooling performance. The synergistic integration of hydrogel phase change and radiation cooling capabilities offered by the P(VDF-HFP) layer enables the DPP to achieve a subambient cooling of 8.62 °C under direct sunlight. Moreover, when applied to the thermal management of electronic devices and fruit preservation due to the phase change property, the DPP effectively reduced surface temperatures by 10 °C and 15.5 °C respectively. Its simplicity and versatility suggest that it could be widely adopted for daytime passive radiation cooling, thereby expanding its practical applications across various fields.
研究领域:
材料科学
·
能源与环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bing Yang,Tingting Yu,Chenyu Yang,Weiwei Wu,Jizhou Jiang
In this work, composite films of molybdenum disulfide (MoS 2 ) with poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) were fabricated using aqueous phase transformation and hydrothermal methods, aiming at efficiently degrading tetracycline hydrochloride (TC). The findings revealed that the degradation efficiency of TC by MoS 2 @PVDF-HFP, when subjected to a combined photocatalysis process involving a simulated pressure electric field and aeration, reached a remarkable 96.11 % within 1 h-surpassing the performance observed under individual conditions. The changes in the electron density cloud on the films surface induced by the pressure electric field and the acceleration of electron transfer rate between contact interfaces were evident. Notably, the composite films exhibited a stable performance with a TC removal rate of 90.23 % after five cycles, including a relatively stable degree of mineralization. We employed Density Functional Theory (DFT) to investigate the changes in the state density of MoS 2 @PVDF-HFP under different conditions, such as compressive stress, tension, and no force. This further clarified the mechanism of piezoelectric coupling photocatalysis promoting induced charge transfer on the films surface. The research findings presented in this paper provide a promising avenue for the application of piezoelectric field-assisted photocatalysis in enhancing material performance.
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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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Shengdong Tao,Jian Li,Lihua Wang,Weiguo Huang,Minchao Zhang,Zhexi Chi,Shuohan Wang,Yongzhi Chen,Lei Shang
Development of an active filler with a large specific surface area, fast ion conductivity phase, special shape, and high electrochemical stability is a critical issue for prominent performance composite solid-state electrolytes (CSEs) in solid-state lithium-ion batteries. Here, we report large specific surface area and coral-like cubic Li7La3Zr2O12 (LLZO) that was synthesized via a metal–organic framework (MOF) at a low calcination temperature (1000 °C). As active fillers, the coral-like cubic LLZO and lithium oxalyldifluroborate (LiODFB) uniformly distributed in a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix provide an interconnected Li-ion transport channel in CSE, which manifests outstanding properties such as a favorable electrochemical stability window (of 4.85 V vs Li/Li+), high ionic conductivity (1.65 × 10–4 S cm–1, 20 °C), and superior interface compatibility with lithium metal. The assembled LiFePO4/CSE/Li and LiCoO2/CSE/Li cells convey predominate performance and initial specific capacities of 135.0 and 135.9 mA h g–1 at 0.5 C, with capacity retention values of 83.51% after 500 cycles and 93.90% after 200 cycles. The coral-like LLZO with a large specific area reduces polymer crystallinity and provides a large phase interface in CSE through interaction of LLZO with LiODFB and PVDF-HFP. The results suggest that coral-like LLZO prepared by MOFs is a promising filler in CSEs for solid-state lithium-ion batteries.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 38
·46737
·
IF 1.901
Xiangze Cheng,Huaiyang Jin,Chunhui Shen,Shanjun Gao,Jiang Wang,Xi Zhu
A polyphosphoric acid functionalized proton exchange membrane (PEM) was prepared by a ring opening reaction using the epoxycyclohexylethyltrimethoxysilane (EHTMS) and amino trimethylene phosphonic acid (ATMP) as raw materials and was modified by poly(vinylidene fluoride)–hexafluoro propylene (PVDF-HFP). The structure of the membranes was characterized by Fourier transform infrared and scanning electron microscopy. The X-ray photoelectron spectroscopy explores the content of the elements in the membrane related to the ion exchange capacity value. The membranes’ properties including water uptake, swelling ratio, proton conductivity, and hydrolysis stability were studied. Performance tests show that when ATMP/EHTMS = 1/5, conductivity of the PVDF-HFP modified PEMs increased from 0.83 × 10 −4 S cm −1 at 20 °C to 9.53 × 10 −3 S cm −1 at 160 °C, the swelling ratio of membranes decreased from 2.71% to 2.13%. The results indicate that the introduction of F atoms is beneficial to increase the proton conductivity and the dimensional stability. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46737.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Pingping Wu,Lin Li,Songtao Shao,Junchao Liu,Jingxia Wang
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF(HFP)) are famous materials for developing flexible sensors, their conductivity, wettability, and piezoelectricity are affected by solvents. However, challenges remain in constructing multi-signals sensor by integrating PEDOT:PSS and PVDF(HFP) through solvent induced strategy, and existing sensors lack the intelligent extraction of stimulus information and accurate recognition of multimodal applications. In this work, a bioinspired flexible sensor with strain-pressure-humidity triple-signals is constructed based on PEDOT:PSS-PVDF(HFP) film (P-P film) through the synchronous induction effect of dimethyl sulfoxide (DMSO). The P-P film with double-layer structure presents excellent conductivity (800 S/cm), piezoelectricity (output voltage, 0.13 V-0.17 V), and humidity sensitivity (response/recovery time, 1.15 s/0.42 s). This phenomenon is resulted from the conformational transition of PEDOT, β -phase content enhancement of PVDF(HFP), and removal of insulated PSS under induction effect of DMSO. The data analysis, mining, and classification are performed through machine learning, which contribute to the recognition rates for different change degree of strain, pressure, and humidity are 93.35 %, 94.59 %, and 99.95 %, respectively. Importantly, a high-precision recognition (97.46 %) for multimodal applications is achieved by intelligently extract the features of strain-pressure-humidity triple-signals. This work is beneficial for improving the performance of existing sensors and developing new high-performance materials with the assistance of machine learning.
研究领域:
材料科学
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人工智能
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生物仿生学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3390
·
IF 5.719
Xinghua Liang,Yujuan Ning,Linxiao Lan,Guanhua Yang,Minghua Li,Shufang Tang,Jianling Huang
The stability and wide temperature performance range of solid electrolytes are the keys to the development of high-energy density all-solid-state lithium-ion batteries. In this work, a PVDF-HFP-LiClO4-Li6.4La3Zr1.4Ta0.6O12(LLZTO) composite solid electrolyte was prepared using the solution pouring method. The PVDF-HFP-LiClO4-LLZTO composite solid electrolyte shows excellent electrochemical performance in the temperature range of 30 to 60 °C. By assembling this electrolyte into the battery, the LiFePO4/PVDF-HFP-LiClO4-LLZTO/Li battery shows outstanding electrochemical performance in the temperature range of 30 to 60 °C. The ionic conductivity of the composite electrolyte membrane at 30 °C and 60 °C is 5.5 × 10−5S cm−1and 1.0 × 10−5S cm−1, respectively. At a current density of 0.2 C, the LiFePO4/PVDF-HFP-LiClO4-LLZTO/Li battery shows a high initial specific discharge capacity of 133.3 and 167.2 mAh g−1at 30 °C and 60 °C, respectively. After 50 cycles, the reversible electrochemical capacity of the battery is 121.5 and 154.6 mAh g−1at 30 °C and 60 °C; the corresponding capacity retention rates are 91.2% and 92.5%, respectively. Therefore, this work provides an effective strategy for the design and preparation of solid-state lithium-ion batteries.Keywords:lithium-ion battery;solid-state electrolyte;composite;electrochemical performance
研究领域:
材料科学
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电化学
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电池技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hu Wang,Jiangchao Chen,Pengfei Pang,Yiran Bai,Zhiqiang Zheng,Tao Huang,Kunpeng Jiang,Yunyun Zhao,Guisheng Zhu,Huarui Xu
The development of lithium-metal batteries (LMBs) with high energy density and safety is considered a top priority for the next generation of rechargeable batteries. However, the mitigation of the inevitable reaction between lithium and the liquid electrolyte (LE), as well as the subsequent formation of Li dendrites, poses a crucial challenge that needs to be addressed. Upgrading traditional LEs serves as a pivotal strategy in achieving this objective. Here, we report a ZIF-8@SiO 2 /PVDF-HFP (ZSPH) quasi-solid electrolyte (QSE) with ultra-multistage pore crosslinked network structure. The interconnected micro-stage pore structure in a honeycomb-like morphology of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) and the rich multistage pore structure of nanoscale SiO 2 “armored” zeolite imidazolium ester backbone-8 (ZIF-8@SiO 2 ) collectively establish a multi-stage ion transport channel. This unique structure facilitates appreciable ionic conductivity (2.21 × 10 −3 S cm −1 at 30 °C) and provides a wide and stable electrochemical window (approximately 5.0 V). The Li/ZSPH9-LiPF 6 /Li quasi-solid-state cell demonstrates an impressive longevity of over 1800 h at a current density of 0.2 mA cm −2 . The high compatibility of the interface between electrode and ZSPH QSE and effective inhibition of Li dendrites growth create synergistic effects, which make it possible to realize high energy density and safe LMBs.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Kai Fu,Ping Huang,Shunjian Xu,Lei Liu,Xuewen Huang,Jun Luo,Yulin Li,Huilan Yu,Haiyan Fu,Hui Ou
Incorporating porous structures into flexible piezoelectric materials has proven to be an effective strategy to enhance the output performance, but the fabrication processes are often intricate or environmentally harmful. In this study, natural sucrose with substantial hydroxyl groups was firstly introduced into polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) as a phase formation inducer, and subsequently removed by the dissolution of water as a pore formation agent, yielding a regular porous structure. Furthermore, porosity of the PVDF-HFP film could be simply modulated by adjusting the mass ratio of sucrose to PVDF-HFP. At low porosity levels, the dielectric constant of PVDF-HFP decreased with the increase of porosity, reaching the minimum at the critical threshold porosity of 38.8 %. Owing to the increased β-phase content and the decreased dielectric constant, the sensitivity of the porous PVDF-HFP film based piezoelectric sensor was tripled to 117 mV/N, which held promise for detecting tactile and slip signals in mechanical arms.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 9
·e202304054
·
IF 1.9
Caihong Xue,Xianlan Wang,Guijun Yang,Hao Yang,Hui Nan,Guocai Ma,Shiai Xu
Graphical A larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) are successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and ionic conductivity of separator can be improved through the carboxylated HCN. The LFP || Li half-cell of the separator has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is a standard electrolyte membrane and binder material for lithium-ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) were successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and electrolyte absorption of PVDF-HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF-HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH-HCN at 25 °C is 0.52 S cm −1 , 4.7 times higher than the initial PVDF-HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium-ion batteries half-cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high-performance LIBs.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
Membranes
·
2023
·Vol. 13
·期 10
·807
·
IF 4.2
Yixia Zhao,Zehao Zhang,Yan Zhang,Yuting Huang,Yanfei Chen,Bofei Chen,Weimin Kang,Jingge Ju
Recently, the multi-level interwoven structured micro/nano fiber membranes with coarse and fine overlaps have attracted lots of attention due to their advantages of high surface roughness, high porosity, good mechanical strength, etc., but their simple and direct preparation methods still need to be developed. Herein, the multi-level structured micro/nano fiber membranes were prepared novelly and directly by a one-step electrospinning technique based on the principle of micro-phase separation caused by polymer incompatibility using polystyrene (PS) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as raw materials. It was found that different spinning fluid parameters and various spinning process parameters will have a significant impact on its morphology and structures. Under certain conditions (the concentration of spinning solution is 18 wt%, the mass ratio of PS to PVDF-HFP is 1:7, the spinning voltage is 30 kV, and the spinning receiving distance is 18 cm), the PS/PVDF-HFP membrane with optimal multi-level structured micro/nano fiber membranes could be obtained, which present an average pore size of 4.38 ± 0.10 μm, a porosity of 78.9 ± 3.5%, and a water contact angle of 145.84 ± 1.70°. The formation mechanism of micro/nano fiber interwoven structures was proposed through conductivity and viscosity tests. In addition, it was initially used as a separation membrane material in membrane distillation, and its performance was preliminarily explored. This paper provides a theoretical and experimental basis for the research and development of an efficient and feasible method for the preparation of multi-level micro/nano fiber membranes.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jiangchao Chen,Hu Wang,Yiran Bai,Pengfei Pang,Zhiqiang Zheng,Huarui Xu,Yunyun Zhao,Kunpeng Jiang,Guisheng Zhu
As the candidate for electrolyte in lithium metal batteries , quasi-solid electrolytes have been affected by the growth of lithium dendrites and the continuous reaction between lithium and electrolyte. Herein, we introduce a quasi-solid electrolyte, ZIF-67@ZIF-8/PVDF-HFP (PHMx), with multi-stage ion transport channels. Additionally, we have developed Zeolitic Imidazolate Frameworks (ZIFs) materials that possess a “cage” structure, which is defined as dual-MC nanoparticles . PVDF-HFP in PHMx serves as mechanical backbone, with dual-MC nanoparticles densely and uniformly distributed within the PVDF-HFP. The synergistic effect of the microporous structure of the PVDF-HFP and that of the dual-MC nanoparticles is utilized to construct multi-stage ion transport channels. PHM9 achieves uniform Li + deposition and inhibits the continuous reaction between lithium and electrolyte. Therefore, PHM9, not only achieves high ionic conductivity of 3.2 × 10 −3 S cm −1 but also remains stable for 1600 h during Lithium-symmetric cycling. Lithium metal battery, assembled with LiFePO 4 as the cathode material , exhibited stable cycling for 400 cycles at a rate of 0.2 C, demonstrating a capacity retention rate of 86.6 %. Similarly, the lithium metal battery utilizing LiCoO 2 as the cathode material demonstrated stable cycling for 200 cycles at a rate of 0.2 C, exhibiting an impressive capacity retention rate of 96.7 %.
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）