SENSORS
·
2020
·Vol. 20
·期 2
·506
·
IF 3.275
Zhuangzhi Sun,Lu Yang,Sicheng Liu,Jintao Zhao,Zhiwei Hu,Wenlong Song
In this paper, a kind of green triboelectric nano-generator based on natural degradable cellulose is proposed. Different kinds of regenerated cellulose composite layers are prepared by a blending doping method, and then assembled with poly(tetrafluoroethylene) (PTFE) thin films to form tribioelectric nanogenerator (TENG). The results show that the open circuit output voltage and the short circuit output current using a pure cellulose membrane is 7.925 V and 1.095 μA. After adding a certain amount of polyamide (PA6)/polyvinylidene fluoride (PVDF)/barium titanate (BaTiO3), the open circuit output voltage peak and the peak short circuit output current increases by 254.43% (to 20.155 V) and 548.04% (to 6.001 μA). The surface morphology, elemental composition and functional group of different cellulose layers are characterized by Scanning Electronic Microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and tested by the electrochemical analyze. Moreover, after multiple assembly and rectification processing, the electrical output performance shows that the peak value of open-circuit output voltage and the peak value of short circuit output current increases by 132.06% and 116.13%. Within 500 s of the charge-discharge test, the single peak charge reached 3.114 V, and the two peak charges reached 3.840 V. The results demonstrate that the nano-generator based on cellulose showed good stability and reliability, and the application and development of natural biomaterials represented by cellulose are greatly promoted in miniature electronic sensing area.Keywords:nano-generator;cellulose;piezoelectric polymers;nanoparticles;performance
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Heng-Chen Liu,Hui-Xian Wang,Yu Yang,Zhao-Yong Ye,Keisuke Kuroda,Li-an Hou
A non-toxic and applicable surface-modified polyvinylidene fluoride (PVDF) membrane consisting of Prussian blue (PB) and aminating silica (A-SiO 2 ) nanoparticles was fabricated for the selective removal of trace radionuclide cesium (Cs) from water. The modified membrane denoted as PB/A-SiO 2 /PVDF exhibited high selective removal of cesium with a high permeate flux of more than 800 L/h∙bar∙m 2 in a wide pH range from 3 to 9. The adsorption experiments showed that the Langmuir isotherm model and the pseudo-second order model fitted well with the experimental results. The maximum adsorption capacity was 10.95 mg-Cs/g-membrane (i.e. 78.21 mg-Cs/g-PB sorbent on membrane) for the membrane at an initial Cs concentration of 50 mg/L. Based on the high Cs adsorption capacity of PB, the membrane could remove more than 97.5% Cs in the presence of the coexisting ions and organic matter for more than 10 h. The filtrated membrane could be effectively regenerated by NH 4 Cl, H 2 O 2 and HNO 3 solution with negligible decrease in removal efficiency after repeated use. With the high membrane flux and selective removal efficiency, the fabricated membrane can be potentially applied in Cs contaminated water treatment.
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JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Guoliang Liu,Wen-Chin Tsen,Shin-Cheng Jang,Fuqiang Hu,Fei Zhong,Bingqing Zhang,Jie Wang,Hai Liu,Guangjin Wang,Sheng Wen,Chunli Gong
In order to obtain a dual-functional nanofiber framework that could simultaneously serve as an ultra-strong reinforcing substrate and a fast ion transport medium, herein, silica coated poly(vinylidene fluoride) (SiO 2 @PVDF) electrospun nanofiber mat was firstly prepared using a universal polydopamine-assisted sol-gel method. After grafting with dense quaternary ammonium groups, quaternized SiO 2 @PVDF (QSiO 2 @PVDF) was yield. This mat with densely cationized surface can not only provide a reliable mechanical support for super-hydrophilic quaternized chitosan (QCS), but also significantly improve the ionic conductivity of the whole system. The resulting QCS impregnated membrane exhibits satisfactory wet strength of as high as 11.9 MPa while pure QCS is hardly self-supporting. Moreover, the surface high-concentration cationic groups can establish channel-like ion transport pathways with the aid of 1D continuous nanofibers, thus obtaining high ionic conductivity of 0.041 S cm −1 (80 °C), which is about 1.3 times higher than that of pure QCS. The single alkaline fuel cell using this membrane demonstrates a maximum power density of 98.7 mW cm −2 . Therefore, this relatively independent design of mechanically support fiber core and high-concentration ion conduction surface provides a new methodology for fabricating high-performance anion exchange membranes.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Wenfeng Han,Haili Wang,Bing Liu,Xiliang Li,Haodong Tang,Ying Li,Huazhang Liu
With Al(NO 3 ) 3 ·9H 2 O as the Al precursor and PVDF as the fluorine source, freestanding AlF 3 sub-microspheres were fabricated following calcination , without the involvement of corrosive HF solution. With the varying of Al(NO 3 ) 3 ·9H 2 O to PVDF weight ratio, θ -AlF 3 and β -AlF 3 , α -AlF 3 were obtained respectively. The formation mechanism, morphology, surface properties and catalytic activities for the dehydrofluorination of 1,1,1,2-tetrafluoroethane to trifluoroethylene were investigated. During the fabrication process, Al(NO 3 ) 3 interacts with O=C bond in DMF. Meanwhile, DMF further interacts with CH 2 species in PVDF. Following calcination , PVDF decomposes to CO 2 and HF fluorinating Al species to AlF 3 . The growth of AlF 3 crystal and particle are confined by PVDF. Consequently, θ -AlF 3 , β -AlF 3 and α -AlF 3 are achieved. At 450 °C, HFC-134a conversion of 23% and reaction rate of 1.9 mmol g −1 h −1 are approached over θ -AlF 3 catalyst. The reaction rate is almost 3 times higher than that of β -AlF 3 and is 40% higher than that of high surface area α -AlF 3 prepared by sol-gel method. No significant deactivation is observed in time on stream of 40 h. The stability is attributed to the interaction of AlF 3 with carbon frame work. The present study provides a scalable and facile synthesis route for AlF 3 spheres with controllable phase structures.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Shengye Chen,Jiale Zhou,Kunquan Li,Zhuohan Chen,Xuanjun Li,Xiaojing Su,Xiaojuan Ao,Huali Xie,Lu Chen,Xuting Wu,Wenjian Wu
Recently, the crude oil spill has brought inevitable harm to the global ecological environment. Due to the high-viscosity crude oil, it is wise to take advantage of the photothermal/electrothermal effects of the membrane to separate the crude oil from the water. However, the functional separation membrane always suffers from low photothermal/electrothermal effects and poor stability. Herein, the vinyl polyvinylidene fluoride/mercapto carbon nanotubes@vinyl-terminated polydimethylsiloxane (PVDF-a/CNT-s@PDMS) membrane with fast photothermal/electrothermal effects and organic absorption property was successfully prepared by electrospinning and multi-layer loading method. The prepared PVDF-a/CNT-s@PDMS membrane resisted a variety of liquids and had stable superhydrophobicity (WCA = 156°). Furthermore, the membrane maintained superhydrophobicity even suffer from water and milk under the applied voltage condition. After 100 wear resistance tests, the membrane maintained stable superhydrophobicity and the separation rate remained unchanged. The surface temperature of the membrane rapidly approached to the maximum temperature in 30 s, showing a rapid photothermal/electrothermal effects, and the average separation rate of crude oil was 1185 kg m −2 h −1 ·bar −1 . Meanwhile, the membrane exhibited outstanding efficiency for separate immiscible oil-water mixtures. Importantly, the incorporation of the sulfhydryl group enhanced the special ability of the composite membrane to adsorb organic dyes from oil phase. Therefore, the PVDF-a/CNT-s@PDMS membrane has a wide range of potential application in the domain of oil-water separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Boyu Li,Huan Wang,Weitao Zhou,Fan Liu,Jianxin He,Gaohui Du,Qingmei Su
Solid-state lithium (Li) metal batteries (LMBs) are promising owing to enhanced safety and high energy density . However, the issues of Li dendrite growth and large electrolyte-electrode interfacial resistance still hinder their practical applications in LMBs. Here, a Li anode-electrolyte structure integration has been developed using in-situ chemical reactions between the polyvinylidene fluoride/Li 3x La 2/3−x TiO 3 /N-methyl pyrrolidone (PVDF/LLTO/NMP) solution and the Li metal interphase. After gradually coating the PVDF/LLTO/NMP solution onto Li metal, NMP as catalyst, inducing PVDF reacted with Li spontaneously to form lithium fluorine (LiF), and the accompanying Ti 4+ ions (in LLTO) are reduced to Ti 3+ ions to form a LLTO ionic/electronic conductor (Li x LLTO). After NMP evaporation, an ionic/electronic conductor protective layer of LiF/Li x LLTO is created between the PVDF/LLTO electrolytes and Li metal. When applying the integrated solid-state Li batteries (ISSLBs), the protective layer can reduce interfacial resistance and the formation of Li dendrites by regulating the even Li deposition redistributing the Li-ion transport. As a result, the as-assembled LiNi 0.8 Co 0.1 Mn 0.1 O 2 /ISSLBs achieves an initial capacity of 181 mA h g −1 and retains 83% capacity after 200 cycles at 0.5 C. This design can be an effective strategy to tailor the properties of Li-metal anodes for achieving dendrite-free LMBs with high performance and high safety.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yingying Zhang,Carice Chong,Wangshu Tong,Haitao Li,Hiang Kwee Lee,Jie Han
Polyvinylidene fluoride (PVDF) is promising for piezo-catalytic applications owing to its excellent biocompatibility, flexibility, and durability. However, it is limited by weak electroactivity originating from its intrinsically low β piezoelectric phase content (<20%) and insulating properties. Here, we achieve efficient piezo-catalysis by introducing a self-polarized PVDF-based composite containing carbon nanotube (CNT) as conductive fillers. Notably, our self-polarized CNT/PVDF (SCP) ensemble exhibits a high β phase content of ∼95%, which is up to 6-fold higher than the original PVDF powder, and superior electrical activity by exploiting the polarity induction effect of water molecules. As a proof-of-concept demonstration, the SCP realizes efficient degradation of organic-polluted water by at least 95% within 2 h of ultrasonication (240 W), even at high pollutant concentration (40 mgL −1 ). Systematic investigations unveil its excellent recyclability and adaptability to various tropical or subtropical natural waters. More importantly, the SCP also achieves efficient H 2 O 2 production of up to ∼13.5 mmol g CNT −1 h −1 , which is > 6-fold and > 19-fold better than standalone self-polarized PVDF (i.e., without CNT content) and emerging piezo-catalytic designs, respectively. This study offers a unique approach for designing PVDF-based piezo-catalyst to expedite mechanically-driven catalysis towards practical applications.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 36
·2302139
·
IF 27.8
Ling Li,Jong Seok Nam,Min Soo Kim,Yifan Wang,Shaohua Jiang,Haoqing Hou,Il-Doo Kim
To address the problem of the serious capacity fading in lithium–sulfur batteries, a multi-functional PEO(polyethylene oxide)/LiFSI (lithium bis(fluorosulfonyl)imide)/PVDF (polyvinylidene fluoride) (PLP) gel polymer electrolyte is exploited by coating PLP on a carbon nanotubes (CNTs) based sulfur cathode (PLP-S/CNTs) with a controlled thermal annealing process. The annealing process leads to the conformal infusion of PLP through the matrix of S/CNTs with retaining the amorphous phase of the PLP, which enhance the rate performance compared to the bare S/CNTs. The PLP coating drives the transformation of more elemental sulfur to Li 2 S 2 /Li 2 S without forming intermediary product by restraining soluble-polysulfides formation. Furthermore, the PLP coating successfully inhibits the dissolution of Li 2 S x ( x > 4) in PEO and prevents the loss of active material in the cathode, which is confirmed by density functional theory calculations. Comprehensively, the PLP coating applied to the surface of the S/CNTs cathode exhibit significantly suppressed shuttle effect and greatly improve long-term cycle stability of the lithium–sulfur battery. The synthesized PLP-coated S/CNTs composite cathode demonstrates a high specific capacity of 573.6 mAh g −1 at a current density of 0.5 C after 1 000 cycles, even achieving 318.1 mAh g −1 at an extremely high C-rate (6 C). which is unprecedented performance among the reported studies on coating technology.
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Materials
·
2023
·Vol. 16
·期 13
·4831
·
IF 3.4
Hongbo Liu,Jiajie Huang,Bingzhi Guo
Dopamine was used to modify polytetrafluoroethylene (PTFE) in order to obtain functional polydopamine (PDA) surface-modified PTFE microporous film (PTFE@PDA). Ag was deposited on the surface of PTFE@PDA using electroless plating in order to obtain Ag-wrapped PTFE@PDA film (PTFE@Ag). A liquid-phase chemical reduction method was employed to prepare nickel nanochains. A Ni@PVDF cast film was obtained by mechanically blended nickel nanochains and polyimide (PVDF). The above two films were hot pressed to give a flexible, ultra-thin, and highly effective electromagnetic shielding composite film with a “3+2” layered structure. IR, XRD, and TEM results showed the PTFE@PDA film surface was coated by a tight plating layer of Ag particles with a particle size of 100~200 nm. PTFE@Ag+Ni@PVDF composite film exhibited excellent electromagnetic shielding effectiveness, with the conductivity of 7507.5 S/cm and the shielding effectiveness of 69.03 dB in the X-band range. After a 2000-cycle bending, this value still remained at 51.90 dB. Furthermore, the composite film presented excellent tensile strength of 62.1 MPa. It has great potential for applications in flexible and wearable intelligent devices.Keywords:electromagnetic shielding;Ag;PTFE;composite film
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AICHE JOURNAL
·
2023
·Vol. 69
·期 9
·e18120
·
IF 3.7
Wei-Min Liu,Heng Mao,Yu-Jie Wang,Shen-Hui Li,Ying-Nan Feng,Li-Hao Xu,Sen Wang,Chan Pei,Zhi-Ping Zhao
The construction of high-performance MOF-based hollow fiber composite membrane (HFCM) modules is a significant, yet challenging task for the biofuel production industry. In this study, a novel approach was taken to fabricate PDMS@ZIF-8/PVDF HFCMs in modules through a facile ZIF-8 self-crystallization synthesis followed by pressure-assisted PDMS infusion for pervaporation ethanol-water separation. The as-prepared HFCMs exhibited an ultrathin separation layer (thickness, 370 ± 35 nm), which was achieved through precise regulation of the ZIF-8 membrane and defect repair by PDMS infusion. Moreover, the strategy utilized in this study resolved the defect issues arising from MOF agglomeration in conventional composite membranes. Impressively, at the optimal packing density, the prepared membrane demonstrated a remarkable ethanol flux (1.11 kg m −2 h −1 ) with an PSI value (26.59 kg m −2 h −1 ) and showed promising long-term stability for the pervaporation of 5 wt% ethanol aqueous solution at 40°C.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jian Xu,Atian Xie,Haotian Sun,Yuting Wu,Chengcai Li,Changguo Xue,Jiuyun Cui,Jianming Pan
Here, a polyvinylidene difluoride composite membrane (PVDF@TA–Fe membrane) was prepared via the repeated spraying of tannic acid (TA) and Fe 3+ to form a TA–Fe complex on the hydrophobic PVDF membrane, which endows the membrane surface superhydrophilicity. The effects of the number of sprays on the surface wettability and emulsion separation capacity of membrane were systematically investigated. It was found that the TA-Fe(III)-complex network formed on the membrane significantly increased the hydrophilicity of the membrane, and the PVDF@TA–Fe membrane was found to exhibit superhydrophilicity/underwater superoleophobicity. The PVDF@TA–Fe membrane was found to exhibit good separation efficiencies (above 99%) and high fluxes (1189.1–2310.0 L m −2 h −1 bar −1 ) when used to separate oil and water in various oil/water emulsions. The repeated separation experiments show that the membrane has a good antifouling performance and maintains a good oil/water separation performance after more than 10 cycles. The present work is of great importance to the large-scale preparation of superhydrophilic membranes and treatment of oily wastewater.
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Polymers
·
2023
·Vol. 15
·期 12
·2688
·
IF 5
Jiale Qiao,Zhaoting Liu,Haiwei Mu,Chao Liu
Polyvinylidene fluoride (PVDF)-based dielectric energy storage materials have the advantages of environmental friendliness, high power density, high operating voltage, flexibility, and being light weight, and have enormous research value in the energy, aerospace, environmental protection, and medical fields. To investigate the magnetic field and the effect of high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4nanofibers (NFs) on the structural, dielectric, and energy storage properties of PVDF-based polymers, (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4NFs were prepared via the use of electrostatic spinning methods, and (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite films were prepared via the use of the coating method. The effects of a 0.8 T parallel magnetic field, induced for 3 min, and the content of high-entropy spinel ferrite on the relevant electrical properties of the composite films are discussed. The experimental results show that, structurally, the magnetic field treatment causes the originally agglomerated nanofibers in the PVDF polymer matrix to form a linear fiber chain with different fiber chains parallel to each other along the magnetic field direction. Electrically, the introduction of the magnetic field enhanced the interfacial polarization, and the (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4/PVDF composite film with a doping concentration of 10 vol% had a maximum dielectric constant of 13.9, as well as a low energy loss of 0.068. The high-entropy spinel ferrite (Mn0.2Zr0.2Cu0.2Ca0.2Ni0.2)Fe2O4NFs and the magnetic field influenced the phase composition of the PVDF-based polymer. The α-phase and γ-phase of the cohybrid-phase B1 vol% composite films had a maximum discharge energy density of 4.85 J/cm3and a charge/discharge efficiency of 43%.Keywords:high-entropy spinel ferrite;polymer;dielectric;ferroelectric;energy density
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