HIGH ENERGY CHEMISTRY
·
2023
·Vol. 57
·期 1
·28-34
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IF 0.7
Fan K.,Zhou G. Q.,Gao C. Y.,Li J. H.,Xu F. L.
Abstract This paper reports on the study that gamma-ray irradiation-induced polymerization of N-isopropyl acrylamide (NIPA) to form Poly(N-isopropyl acrylamide) (PNIPA), which was then grafted on the surface of polyvinylidene fluoride (PVDF) membrane to prepare modified PVDF-g-PNIPA membrane. We analyzed the influence of different irradiation doses and dose rates on the grafting rate of modified membranes, and the grafting rate increased with the irradiation dose under a certain irradiation dose. Through analysis of Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TGA), the efficient progress of the grafting reaction was confirmed. With the increase of the grafting rate, the pore size of the membrane surface decreased gradually, but the surface roughness of the membrane tended to increase through the analyse of scanning electron microscopy (SEM) and atomic force microscopy (AFM). Finally, a mechanistic explanation for the grafting of PNIPA on the surface of PVDF membranes based on these experimental results was proposed.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6010-6017
·
IF 6.4
Tianran Zhang,Qinzhao Sun,Zepeng Wang,Ruirui Kang,Fang Kang,Rong Xue,Jiping Wang,Lixue Zhang
Electrostatic energy storage dielectric polymers are essential for pulsed power applications due to their high power density. However, it suffers from low energy density and poor efficiency at high temperatures, which seriously hinders its application. Herein, a polyetherimide – MgO/polymethyl methacrylate/poly(vinylidene fluoride) – polyetherimide sandwich-structured composite was prepared by solution casting and hot-pressing. The experimental results show that MgO acted as a nuclear agent to promote the crystallization of PVDF, thereby improving the polarization at high temperatures. At 150 °C, the optimized composite exhibited a high discharge energy density of 3.34 J cm−3 when the charge–discharge efficiency was above 90% at 350 MV m−1. MgO alleviated both the ferroelectric loss and conduction loss at the low electric field as well, resulting in high polarization and high efficiency at the low electric field. Through this work, we made a new attempt to enhance the energy storage performance of high-temperature polymer-based dielectric composites under a low electric field.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jingxue Wang,Yanting Liang,Zichen Wang,Bingjie Huo,Chao Liu,Xiaxia Chen,Hongwei Xu,Dongmei Li,Zhaoyou Zhu,Yinglong Wang,Fanqing Meng
Using water flow energy in the environment for water treatment is a feasible solution to alleviate energy shortages and environmental pollution. This work prepared a Cu 2 O@MoS 2 /PVDF modified pipeline with superior piezoelectric properties for norfloxacin (NOR) degradation. The piezoelectric coefficient d 33 of Cu 2 O@MoS 2 /PVDF increased by 27.7 % compared with PVDF. The piezoelectric current response test demonstrated that Cu 2 O@MoS 2 /PVDF had a higher current response than PVDF. FTIR showed that the presence of Cu 2 O@MoS 2 significantly increased the piezoelectric β -phase content of PVDF. The Cu 2 O@MoS 2 /PVDF pipeline exhibited the best degradation efficiency of 99.3 % within 40 min when the flow rate reached 1.389 L min −1 . O 2 – and OH have been shown to play an important role in NOR degradation and the possible degradation mechanism and pathways of NOR were proposed. This work provides a promising method for the efficient and green treatment of organic pollutants in water by using water flow energy and has practical application significance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wanzheng Ren,Jian Pan,Wenqiang Gai,Xinyu Pan,Haimei Chen,Jiao Li,Lilan Huang
A crucial step in the purification and recycling of industrial waste oil is the separation and removal of trace water from emulsified oil. After optimizing the polymer content, solvent composition, and SiO 2 nanoparticle addition amount of the spinning precursor solution, a Polyvinylidene fluoride- co -trifluoroethylene chloride (PVDF-CTFE)/SiO 2 nanofibrous membrane with micro and nano-rough structure was prepared by electrospinning. Using scanning electron microscopy, a pore size analyzer, a contact angle tester, a single-fiber strength tester, and a gravity separation experiment, the influence of SiO 2 addition on the morphology, pore size distribution , wettability , mechanical, and separation properties of the modified membranes was characterized. The results demonstrated that the water contact angle of the nanofibrous membrane was increased to 151.3° of superhydrophobic when SiO 2 was added at a concentration of 2.5 wt%. The nanofibrous membranes exhibited outstanding separation performance (>99%) for water-in-oil mixtures and emulsions, as well as for various oil-water systems. Moreover, the PVDF-CTFE/SiO 2 nanofibrous membranes exhibited superior multi-cycle performance and consistent chemical resistance. This research yielded a novel material and a straightforward method for fabricating superhydrophobic nanofibrous membranes, which demonstrated greater application potential in oil-water separation.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chaoxu Zhou,Jin Wang,Qingyun Zhang,Mengmeng Dou,Kaili Huo,Chao Han,Boru Gao
Nanocomposite membranes (NCMs) incorporated with nanomaterials have recently received increasing attention, but the preparation of high-performance membranes is still challenging due to the hydrophilicity and self-aggregation of the nanoparticles . In this study, graphite carbon nitride containing nitrogen defects was modified using dopamine (PDA@DCN) for effective alleviation of the agglomeration of nanoparticles resulting in a uniform casting solution. A non-solvent-induced phase separation method was adapted to prepare PVDF NCMs by using PDA@DCN as an effective additive. Superior permeability and selectivity were exhibited by the PDA 0.25 @DCN/PVDF 2 membrane (where a DA concentration of 0.25 g/100 mL was used in PDA@DCN preparation and 2% PVP was added during the membrane preparation) with the pure water flux of 390 L/(m 2 ·h) and Bovine serum albumin (BSA) rejection of 95.9%. The extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory revealed that the improvement of the flux recovery rate of PDA 0.25 @DCN/PVDF 2 was due to the decreased attractive interaction for fouling. Ternary phase diagram and viscosity experiments confirmed that the addition of PDA 0.25 @DCN accelerated phase inversion rate (as evident from thermodynamics and kinetics) and increased the porosity with smaller average surface pore size, which is expected to have good permeability and selectivity as an ultrafiltration membrane. Moreover, an excellent self-cleaning performance was demonstrated by PDA 0.25 @DCN/PVDF 2 , with a flux recovery rate of 84.5%, simply under visible light irradiation, which indicates its potential for environment-friendly practical application.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wen He,Hui Ding,Xu Chen,Wensheng Yang
Composite solid electrolyte (CSE) membranes for lithium metal batteries attract great attention with excellent safety and suitable flexibility. Herein, we construct a polyethylene oxide-based ultrathin CSE membrane that is enhanced by a 3D fiber network composed of Poly (vinylidene fluoride- co -hexafluoropropylene) fibers and Li 7 La 3 Zr 2 O 12 particles directly fabricated on the cathode. The 3D fiber network facilitates the rapid transport and uniform deposition of Li + , and enhances the mechanical strength of the electrolyte membrane, thereby effectively inhibiting the growth of lithium dendrites . Moreover, the unique preparation method reduces the interfacial impedance, and it can also greatly reduce the electrolyte thickness, which is beneficial to increasing the energy density of the battery. The lithium symmetric battery shows stable cycling over 1500 h under 0.2 mA cm −2 . Li/LiFePO 4 battery with the CSE membrane exhibits a high reversible capacity of 155.8 mAh·g −1 at 0.2 C for 100 cycles and the capacity retention rate is 98.0%. Furthermore, the obtained CSE membrane has a broadened electrochemical window of 4.83 V, and the reversible capacity of the Li/LiNi 0.8 Co 0.1 Mn 0.1 O 2 battery is 160.6 mAh·g −1 at 0.2 C for 100 cycles. These findings showed that the structure proposed here is a viable electrolyte strategy for advanced solid-state lithium metal batteries.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Zhihui Yi,Zhuo Wang,Dan Wu,Ying Xue
Electrostatic capacitors have high power density, but how to improve the energy storage density of electrostatic capacitors has always been the key to solving energy problems in the background of the energy crisis. Designing multi-layer core–shell inorganic nanofillers is an effective way to break the contradiction between high dielectric constant and high breakdown strength in nanocomposites to improve the energy storage performance. Herein, polyvinylidene fluoride (PVDF)-based nanocomposites are proposed, which are filled with multi-layer core–shell structured inorganic BaTiO3@BaxSr1–xTiO3@DA nanoparticles (BT@BST@DA NPs). In the optimized 2 wt % PVDF/BaTiO3@BaxSr1–xTiO3@DA nanoparticle (PVDF/BT@BST@DA NPs) nanocomposite material, a high discharge energy density of 13.75 J/cm3 (370 MV/m) can be obtained, as well as excellent discharge efficiency. The dielectric performance and energy storage density of 2 wt % PVDF/BT@BST@DA NPs are proven to be better than 2 wt % PVDF/BaTiO3@DA nanoparticles (PVDF/BT@DA NPs). This work provides a strategy for the development of dielectrics for electrostatic capacitors with high energy storage density.
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FUEL
·
2022
·
IF 8.035
Shuai-Zhong Wang,Binbin Huang,Shuwen Chen,Pei-Jin Liu,Wei Li,Qi-Long Yan
In this paper, energetic combustion catalysts doped core–shell Al@PVDF/AP composites have been fabricated via a spray-drying method, where three kinds of graphene-based energetic coordination polymers (GECPs, GO-CHZ-Co, GO-CHZ-Ni and GO-CHZ-Cu) are employed. These composites have been characterized comprehensively in terms of morphologies, thermal decomposition behaviors, energy density, combustion performances and condensed combustion products (CCPs). The results show that the GO-CHZ-Co and GO-CHZ-Cu could increases the heat of explosion for Al@PVDF/AP composites from 6885.2 J·g −1 to 7491.0 J·g −1 and 7390.1 J·g −1 , respectively, which are 8.8 % and 7.3 % higher than the blank reference samples. Moreover, the burn rates for these composites decrease when GO-CHZ-Co or GO-CHZ-Ni is included, indicating that these composites are promising candidates with improved energy density even unusually with decreased burn rates.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Chi-Yang Tsai,Ying-Ling Liu
Solid polymer electrolytes (SPEs) have received much research attention for the safety concerns about high energy density batteries. The major issues to be addressed for SPEs are relatively low ionic conductivity and poor electrolyte/electrode interfacial compatibility. In this work, lithium-ion-conduction pathways have been built up in SPEs through introduction of ion conductor-containing chains on the pore walls of porous PVDF membranes. SPEs employing the functionalized membranes as supporting matrix have been prepared through an in situ polymerization technique. The built-in ion-conduction pathways result in a 6.7-times of ionic conductivity to the corresponding SPEs, compared to the SPEs made with the neat PVDF support. The SPEs also exhibit an electrochemical stability window up to 4.5 V and a significant suppression on lithium dendrite formation. The corresponding LiFePO 4 /SPE/Li cells demonstrate a discharge capacity of 141 mAh g −1 at 0.1 C and a capacity retention of 95% after 100 charging/discharging cycles. The results provide a structural design and synthesis approach for conveniently building up lithium-ion transportation channels in SPEs for high performance lithium metal batteries .
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Materials Today Physics
·
2023
·
IF 11.5
Lvxuan Ye,Liu-Xin Liu,Guang Yin,Yunfang Liu,Zhiming Deng,Cheng-Zhang Qi,Hao-Bin Zhang,Zhong-Zhen Yu
To endow transition metal carbide (MXene) fibers with satisfactory chemical resistances, high electrical conductivity and enhanced ductility, multifunctional hollow core-shell fibers with ductile polyvinylidene fluoride (PVDF) shell and compactly ordered MXene hollow core are fabricated with a coaxial wet-spinning assembly strategy. The partial hydroxylation of the PVDF occurred during the coagulation in the presence of ammonium hydroxide enhances the interfacial interaction of the PVDF layer with the MXene layer. The hollow core consisting of compact and ordered MXene layer provides the fibers with a high electrical conductivity of 3.08 × 10 5 S m −1 , while the PVDF shell endows the fibers with enhanced ductility and excellent resistances to acid, alkali, and seawater . The hollow core-shell structure makes the fiber lightweight, and facilitates multiple scattering of electromagnetic waves , resulting in increased electromagnetic wave absorption and attenuation. The ductile and conductive textile made of the hollow core-shell fibers with a 6 μm-thick MXene layer exhibits a high electromagnetic interference shielding effectiveness of ∼60 dB. Moreover, the resultant fibers exhibit exceptional Joule heating performances for human thermal management. The high conductivity, enhanced ductility, strong chemical resistances, and satisfactory Joule heating properties make the hollow core-shell fibers promising for electromagnetic interference shielding and wearable heating applications.
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Journal of Energy Storage
·
2023
·
IF 9.4
Lingguang Yi,Xiaoyi Chen,Changfei Zou,Jiali Liu,Xilin Cao,Xiyuan Tao,Zihao Zang,Liping Zheng,Li Liu,Xianyou Wang
Rechargeable lithium metal batteries (LMBs) have encountered bottlenecks in energy density , durability, and safety issues. Designing functional polymer electrolytes has been considered as an effective way to develop high-performance of LMBs. In this study, PVDF-HFP-matrix polymeric electrolytes blended with co polymer P(MMA- co -PEGMEMA) (PPxPy) via a simple one-pot free-radical polymerization are successfully designed and prepared. It has been found that the PPxPy electrolytes can construct different comb -like networks via systematically tuning monomer ratios. The tailored PP5P5 gel electrolyte exhibited high ionic conductivity of 0.74 × 10 −3 S cm −1 at room temperature (RT), an enlarged electrochemical window up to 4.77 V, high lithium-ion transference number t Li+ of 0.65, and good mechanical property with Yang's modulus up to 131 MPa. Benefited from these good properties, the Li||LiFePO 4 batteries assembled with PP5P5 gel electrolyte achieved an exceptional discharge capacity of 152 mAh g −1 with nearly 100 % Coulombic efficiency after 150 cycles at 1C. Furthermore, the Li|PP5P5|NCM811 cell exhibits excellent reversible specific capacity of 188 mAh g −1 at 0.1C. Consequently, it can be anticipated the as-prepared functional polymer structure to provide a reliable method for the preparation of polymer electrolytes in quasi-solid-state batteries with high-energy-density.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Tianxing Gong,Tingyu Li,Lisha Meng,Yadong Chen,Tao Wu,Jingqiu Zhou,Guoxiu Lu,Zhiguo Wang
Native bone is piezoelectric in nature and generates abundant surface charges under mechanical compression, which regulate osteoblast proliferation, differentiation, adhesion, and so on. Poly (vinylidene fluoride) (PVDF) is becoming one of the most popular piezoelectric polymers because of its easy processability and good biocompatibility. Unfortunately, because only the β and γ crystal phases of PVDF have piezoelectricity, post-treatments, for example, polarizing at high temperature, are required to enhance the piezoelectricity of PVDF scaffolds after fabrication. In this study, we reported a phase-separation-hydration method to fabricate a calcium phosphate silicate (CPS)-doped PVDF scaffold. Our method fabricated a better piezoelectric scaffold than native bone without further processing (∼ 3 pC/N vs. 0.7 pC/N). In addition, the scaffold was mechanically compatible (∼ 7 MPa) with the cancellous bone with sufficient porosity (∼ 45%) to facilitate osteoblast infiltration and bone ingrowth. The in vitro biocompatibility analyses proved that the prepared CPS-PVDF scaffold was biocompatible with osteoblast cells and encouraged osteoblast redifferentiation. In conclusion, our results suggest that this CPS-PVDF scaffold is a promising candidate for bone tissue engineering applications.
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