JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Ning Liu,Jie Wang,Huiyu Yang,Fan Cheng,Shuguang Bi,Guoliang Liu,Ying Ou,Hai Liu,Chunli Gong
In order to improve the proton conductivity, CH 3 OH barrier performance and long-term durability of proton exchange membranes in direct methanol fuel cells (DMFCs), herein, a novel functional nanofiber substrate (IL-ZIF-8@PVDF) was prepared by in situ growing metal-organic framework (ZIF-8) on poly(vinylidene fluoride) (PVDF) nanofibers, followed by modification with ionic liquid (IL) containing sulfonic acid groups. PVDF nanofibers can provide flexible mechanical support for ZIF-8, thereby effectively solving the processing difficulties of ZIF-8 caused by its brittleness. Further IL modification of ZIF-8 can not only increase the compatibility between ZIF-8@PVDF and the filling polymer, but also utilize the continuous PVDF nanofiber network to establish long-distance continuous H + transport pathways within the membrane. The as-prepared sulfonated poly (ether ether ketone) impregnated IL-ZIF-8@PVDF composite membrane showed a very high proton conductivity of 161.92 mS cm −1 (80 °C). Meanwhile, the presence of nanofiber backbone and ZIF-8 inside the membrane effectively limited the swelling and methanol permeation. The peak power density (PPD) of the DMFC output equipped with the membrane is up to 114.86 mW cm −2 (2 M methanol, 80 °C), 1.28 times that of the commercial Nafion 211. The durability test suggested that the composite membrane assembled DMFC possessed excellent open circuit voltage stability (only 6.3 % attenuation after 320 h of continuous testing). This work provides a new design idea for PEMs for DMFCs.
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高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Tao Wei,Zao-Hong Zhang,Zhi-Meng Wang,Qi Zhang,Yu-sheng Ye,Jia-Hao Lu,Zia ur Rahman,Zhi-Wei Zhang
Solid composite electrolytes (SCEs) are regarded as an effective solution to ensure safety and enhance the energy density of lithium-based batteries. This work reports an ultrathin SCE membrane (∼ 15 μm) based on Li6.4La3Zr1.4Ta0.6O12/PVDF-HFP/LiTFSI/succinonitrile; it not only possesses good ionic conductivity (6.53 × 10–4 S cm–1 with a little amount of liquid electrolyte) at 30 °C and a satisfactory lithium ion transfer number (0.55 without electrolyte), but also exhibits excellent thermal and mechanical properties. A symmetric cell with SCE succinonitrile-10% (SN-10%) can be continuously cycled without short circuit at 0.2 mA cm–2 for about 340 h. Moreover, a high reversible discharge capacity of 150.2 mAh g–1 at 0.5 C was maintained by the cell (LiFePO4/SCE SN-10%/Li) after 269 cycles at room temperature. Notably, a capacity of about 100 mAh g–1 at 5 C was also obtained. This work might guide the improvement of future solid-state lithium/sodium metal batteries and lithium–sulfur batteries, even for wearable flexible batteries.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 4
·590
·
IF 5.1
Keduo Yan,Xiangyu Gong,Lan Xu
Electromagnetic shielding (EMS) materials play an important role in modern technology and industry, especially in electronic equipment, communication technology, military applications and so on. With the continuous progress of technologies and the increasing demands for functional materials, EMS materials are expanding towards flexibility and being lightweight. Recently, metal–organic frameworks (MOFs) have garnered significant attention in the EMS field due to their unique structure and adjustable properties. In this paper, alloy-based porous nanospheres (CCZ-C) were fabricated by heat-treatment using CoCuZn-MOFs as precursors, and then electrospun CCZ-C/PVDF nanofiber membranes (NFMs) were prepared in a large-quantity by blending them with PVDF. Afterwards, a hierarchical porous structured NFM (MPPA) was obtained by loading a highly conductive Ag nanolayer on the surface of CCZ-C/PVDF nanofibers using pDA as a binder. By adjusting the CCZ-C content, it was determined that the EMS performance of MPPA was highest when the CCZ-C content was 2 wt.%, with an average SSE of 12,017.01 dB·cm2·g−1. This was because the hierarchical porous structure formed by adding an appropriate amount of CCZ-C further improved the electromagnetic attenuation and impedance matching of MPPA.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qi Chai,Bo Yang,XiuMin Li,Fengfeng Gao,Xiaogang Hao
A nickel hydroxide/carbon black/polyvinylidene fluoride (Ni(OH) 2 /CB/PVDF) film was coated on a graphite plate substrate and used for the selective and efficient extraction of W(VI) using self-driven film adsorption. The excellent self-driven adsorption performance of Ni(OH) 2 /CB/PVDF film for W(VI) was demonstrated by the comparison of the experimental performance of film adsorption and electrochemically switched ion exchange (ESIX) process. In the Ni(OH) 2 /CB/PVDF film, the adsorption of W(VI) by Ni(OH) 2 was achieved through the ligand exchange reaction with W(VI) and abundant hydroxyl groups, which ensured the self-driven performance. The adsorption capacity of the self-driven Ni(OH) 2 /CB/PVDF film for W(VI) under neutral conditions could reach up to 37.53 mg·g −1 after 12 h. Moreover, the adsorption kinetics and adsorption thermodynamics showed that the adsorption of W(VI) on Ni(OH) 2 /CB/PVDF films was more in line with the pseudo-second-order kinetic model, and the adsorption was heat-absorbing and spontaneous. After seven cycles of adsorption/desorption, the adsorption capacity of W(VI) by Ni(OH) 2 /CB/PVDF film could reach 79.37 % of its initial value, which showed good adsorption/desorption cycle performance. Moreover, Ni(OH) 2 /CB/PVDF films showed high selectivity for W(VI) when WO 4 2− coexisted with Cl − , NO 3 – , and SO 4 2− , respectively. This study confirmed that the self-driven Ni(OH) 2 /CB/PVDF film had efficient and stable adsorption performance for W(VI), which can be regarded as a promising method for the selective adsorption of W(VI) from aqueous solution.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Jinghan Zhang,Hao Liu,Yuxuan Ma,Hang Wang,Chengfeng Chen,Guilong Yan,Mingwei Tian,Yunze Long,Xin Ning,Bowen Cheng
In the present research, a novel composite proton exchange membrane with heterogeneous dual-interface proton transport channels are constructed by impregnating γ-polyglutamic acid functionalized cellulose whiskers/poly(vinylidene fluoride) nanofibers (PGA@CW/PVDF) into the sulfonated polysulfone matrix through a micro-impregnation method. The heterogeneous dual-interfaces generate enriched proton acceptors and donors facilitating the proton conduction, which is clarified by calculating the activation energy barriers of different proton transport pathway via density functional theory . The composite membrane with 15% content of PGA@CW/PVDF demonstrates a high proton conductivity of 0.582 S cm −1 (80 °C). Benefiting from the combined physicochemical and structural advantages of PGA@CW/PVDF and the matrix, the composite membrane achieves a low methanol permeability of 2.05 × 10 −7 cm 2 s −1 , an enhanced tensile strength of 44.61 MPa, and a competitive power density of 201.14 mW cm −2 . This study demonstrates a promising prospect in direct methanol fuel cell application .
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Huiqiang Liu,Yingbo Chen,Xiaoyu Hu,Kai Zhang,Bowen Cheng,Dongqing Liu,Yufeng Zhang,Sankar Nair
In this work, a titanium oxide/polyvinylidene fluoride (TiO 2 /PVDF) hollow fiber membrane was fabricated to fractionate the dye and Na 2 SO 4 produced in textile wastewater. This hollow fiber membrane offered high retention of Congo red and methylene blue dyes with little rejection of Na 2 SO 4 . More importantly, the membrane was obtained using single orifice spinneret through a simple, rapid, and less expensive procedure. Meanwhile, the membrane exhibited good hydrophilicity, flux recovery ratio, and long-term stability, when appropriate blending of TiO 2 nano-particles was conducted. These results highlight interesting potential applications, and open new directions toward the designing of efficient functional hollow fibers for effective fractionation of dye and Na 2 SO 4 for the treatment of textile wastewater.
研究领域:
环境工程
·
膜科学
·
水处理
·
纳米复合材料
·
分离技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Qianqian Wang,Xiaoting Wang,Zhaohui Wang,Jun Huang,Yong Wang
Polyvinylidene fluoride (PVDF) is one of the most extensively used membrane materials, but PVDF membranes suffer deteriorating performances because of the intrinsic hydrophobic nature of PVDF. Significant efforts have been made to improve the hydrophilicity of PVDF membranes; however, there is frequently a tradeoff between the permeability and selectivity of the modified PVDF membranes. In this work, we broke the tradeoff effect by the atomic layer deposition (ALD) of TiO 2 onto the PVDF membranes using TiCl 4 and water as precursors. The vaporized precursors accessed the small membrane pores and produced a conformal and uniform thin layer of TiO 2 that was tightly adhered to the pore walls. We progressively reduced the membrane pores by repeatedly cycling the deposition process until the membrane pores were completely blocked. The deposition of TiO 2 enhanced the hydrophilicity and fouling resistance of the PVDF membranes, which was more evident at higher ALD cycle numbers. We simultaneously achieved greatly improved water flux and retention at 120 ALD cycles as a result of the competing effect of the increased hydrophilicity and reduced pore sizes. Moreover, the water flux could be sensitively tuned by changing the exposure time of the precursors. The thermal stability of the TiO 2 -deposited membranes was enhanced at a low ALD cycle number of 30.
研究领域:
材料科学
·
膜技术
·
纳米技术
·
环境工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Mengjun Wu,Dan Liu,Deyu Qu,Zhizhong Xie,Junsheng Li,Jiaheng Lei,Haolin Tang
Composite polymer electrolytes (CPEs) are very promising for high-energy lithium-metal batteries as they combine the advantages of polymeric and ceramic electrolytes. The dimensions and morphologies of active ceramic fillers play critical roles in determining the electrochemical and mechanical performances of CPEs. Herein, a coral-like LLZO (Li6.4La3Zr2Al0.2O12) is designed and used as a 3D active nanofiller in a poly(vinylidene difluoride) polymer matrix. Building 3D interconnected frameworks endows the as-made CPE membranes with an enhanced ionic conductivity (1.51 × 10–4 S cm–1) at room temperature and an enlarged tensile strength up to 5.9 MPa. As a consequence, the flexible 3D-architectured CPE enables a steady lithium plating/stripping cycling over 200 h without a short circuit. Moreover, the assembled solid-state Li|LiFePO4 cells using the electrolyte exhibit decent cycling performance (95.2% capacity retention after 200 cycles at 1 C) and excellent rate capability (120 mA h g–1 at 3 C). These results demonstrate the superiority of 3D interconnected garnet frameworks in developing CPEs with excellent electrochemical and mechanical properties.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态电池
·
聚合物纳米复合材料
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yeqiang Lu,Hui Ma,Fuyou Chen,Yawen Zhao,Luhong Wen,Congjie Gao,Lixin Xue
Effective oil/water separation is urgently demanded but still remains a global challenge. Membranes with super-wettability have been rapidly developed, but most of the membranes are suffered from the complicated fabrication procedures and inability of separating different types of emulsions. In this work, super-amphiphilic PVDF composite membranes were developed via synchronous in-situ growth and immobilization of Ag nanoparticles during phase inversion. This method allowed the membrane formation and nanoparticle immobilization at the same time. The impact of silver growth time on the surface morphology and wettability was comprehensively investigated. The introduction of Ag nanoparticles endowed the membranes with micro/nano-structures and super-wetting property, which made the membrane possess reversible under-liquid superamphiphobicity. The PVDF composite membranes exhibited high permeate flux and outstanding separation efficiency for different surfactant-stabilized oil/water emulsions. Moreover, the prepared membranes could be regenerated through a facile method of rinsing and drying and the high separation performance could be maintained after repeated cycles, indicating the outstanding anti-fouling performance of the membranes. Furthermore, the PVDF composite membranes exhibited superior antibacterial performance. This work made progress in fabricating super-wetting membranes with excellent emulsion separation performance and the membranes can be prospective candidate for oily-mixture separation in practical applications.
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Wanying Xie,Wei Song,Ji Li,Xiaolei Zhang,Wenyi Dong,Feiyun Sun
Modifying PVDF membrane by blending hydrophilic nano TiO 2 has been highly concerning, but its practical application is not well investigated. In this study, PVDF-TiO 2 membrane was employed in two modes to treat micro-polluted raw water for the first time, direct membrane filtration and pre-oxidation assists membrane filtration. At two filtration modes, the PVDF-TiO 2 membrane had comparable rejection capability to the unmodified PVDF membrane, as the removal of permanganate index (COD Mn ) was 0.26–0.72 mg/L, UV 254 was 0.0070–0.0618 cm −1 , turbidity was 1.60–4.49 NTU, and the total number of colonies was 360–23,780 CFU/mL. As for raw water treatment , using Fe 2+ /sodium dithionite (DTN)/O 2 system as the pre-oxidation process to assist the filtration of the PVDF-TiO 2 membrane was feasible. After optimization, the applicable conditions of the Fe 2+ /DTN/O 2 process were DTN dosage at 100 mg/L and a C Fe / C DTN of 1:4. As a result, the effluent qualities of the PVDF-TiO 2 membrane significantly improved. It was investigated that atrazine (ATZ), COD Mn , UV 254, and turbidity reduced, which was realized by the synergic effects of the pre-oxidation by free radicals and flocculation by iron. Pre-oxidation of the Fe 2+ /DTN/O 2 process could also enhance the permeability of the PVDF-TiO 2 membrane from 53.6 to 58.0 L/(m 2 ·h), nearly two times the PVDF membrane. Besides, the practical fouling of the PVDF-TiO 2 membrane was stably alleviated by the reduced R t , R re, and R ir , mainly due to constraining the internal pore fouling effectively.
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PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 23
·15551
·
IF 4.614
Renguo Liu,Xue Li,Jinhui Huang,Haoliang Pang,Qiongfang Wan,Kun Luo,Ya Pang,Lingyu Wang
g-C3N4/Ag3PO4/TiO2nanocomposite materials were loaded onto a polyvinylidene fluoride (PVDF) membrane using a phase inversion method to obtain a photocatalytic flat membrane for dye removal. The morphology, structure, and photocatalytic activity of the g-C3N4/Ag3PO4/TiO2nanoparticles and composite membrane were evaluated. The g-C3N4/Ag3PO4/TiO2/PVDF membrane exhibited superior morphology, hydrophilic properties, and antifouling performance compared with the raw PVDF membrane. Four-stage filtration was performed to evaluate the self-cleaning and antifouling capacity of the g-C3N4/Ag3PO4/TiO2/PVDF membrane. Upon irradiating the composite membrane with visible light for 30 min, its irreversible fouling resistance (Rir) was low (9%), and its flux recovery rate (FRR) was high (71.0%) after five filtration cycles. The removal rate of rhodamine B (RhB) from the composite membrane under visible light irradiation reached 98.1% owing to the high photocatalytic activity of the membrane, which was superior to that of raw PVDF membrane (42.5%). A mechanism of photocatalytic composite membranes for RhB degradation was proposed. Therefore, this study is expected to broaden prospects in the field of membrane filtration technology.Keywords:g-C3N4/Ag3PO4/TiO2nanocomposite;photocatalytic membrane;self-cleaning;membrane fouling;dye
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PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xinlin Wang,Rudong Zhu,Xiangkui Wang,Fengjiao Liu,Yan Gao,Rongfeng Guan,Yalei Chen
In this paper, the application of metal organic frameworks (MOFs) doped with carbon dots in fluorescence detection was studied.CDs@Eu-MOF/PVDF thin films were prepared by simple solvothermal method, carbon dots modification and in-situ growth process.The structure and morphology of the film was characterized by XRD, SEM, FT-IR and XPS.The results show that CDs@Eu-MOFs membrane has strong red fluorescence, good stability in methanol solvent, and high selectivity and sensitivity to nitrobenzene and 4-nitrophenol.The CDs@Eu-MOFs/PVDF film material can be used to detect nitrobenzene and 4-nitrophenol in methanol solvent and gaseous state. The detection limits of nitrobenzene and 4-nitrophenol in liquid are 0.2807 mg/L and 0.0168 mg/L, and the detection limits of nitrobenzene and 4-nitrophenol in gaseous state are 0.346 mg/L and 0.0136 mg/L.
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高影响因子
危险品化学品经营许可证（带存储）