Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yongrun Dong,Wen Li,Tao Huang,Shuaigang Ge,Linghang Kong,Chuang Ning,Zequan Li,Wei Gao,Bingsuo Zou
Recently, lead-free double perovskites have been regarded as a promising alternative to lead halide perovskites due to their wide emission band, and environmental protection and stability properties, and are expected to become a series of rising star materials in the lighting field. However, currently, the growth of most lead-free double perovskites occurs in the strong acid environment, which not only brings high cost and environment risk, but also makes it hard to realize large-scale applications with powder products. Herein, we apply a strategy of in situ synthesis of lead-free double perovskites in a polymer matrix by using a small amount of precursors and relatively friendly DMSO solvent to obtain efficiently luminescent Sb3+/Mn2+ co-doped Cs2KInCl6/PVDF composite films in a large-area. The co-doping of Mn2+/Sb3+ into this inorganic double perovskite matrix makes microcrystals with good crystallinity and size distribution in this polymer. The as prepared co-doping composite film with Mn/Sb feeding ratio 16 : 1 shows the brightest white light emission under 320 nm excitation, with a photoluminescence quantum yield (PLQY) as high as 86.98%. The energy transfer (E-T) from the charge-transfer band to the triplet self-trapped exciton (STE) around Sb3+ and then to the ferromagnetic (FM) coupled Mn2+ pair 3d state was confirmed by the temperature-dependent PL spectra and density functional theory calculations. Finally, a single-compound white light emitting diode with chromatic coordinates of (0.31, 0.33) and fluorescent anti-counterfeiting labels could be fabricated based on this composite film with the best white emission. This work provides a new strategy for the application of lead-free double perovskites in the fields of lighting and anti-counterfeiting.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zihan Tian,Yumei Xu,Qingyu Liu,Xiao Wu,Shuhao Qin,Jing Zhang,Hong Wang,Jianxin Li,Zhenyu Cui
The ridge-like PVDF/CQDs-TiO 2 @CQDs hybrid piezo-photocatalytic film was fabricated via an " in situ hydrothermal-vapor induction" method, in which the S-scheme TiO 2 @CQDs heterostructures were grown in situ and uniformly immobilization onto the polyvinylidene fluoride (PVDF) film surface through Ti-F coordination bonds. The effects of hybrid film morphology, carbon quantum dots (CQDs) doping, and flow rate on piezo-photocatalytic degradation performance were investigated. The ridge-like microstructure increased the exposure of adsorption and catalytic active sites. The film reactor driven by the flow of dye solution and light illumination promoted the adsorption of pollutants while establishing a dual built-in electric field (IEF) between the piezoelectric PVDF and catalysts, TiO 2 and CQDs, which accelerated photogenerated charge transfer and separation. Finally, a dynamic piezo-photocatalytic process was realized for the efficient and synergistic degradation of RhB. The reaction rate constant ( ks ) of the dynamic piezo-photocatalytic degradation was about 2.3 times that of the static photocatalytic process. Structural optimization and density functional theory (DFT) calculations of Rhodamine B (RhB) molecules were performed using Gaussian software. The degradation products, degradation pathways, and degradation mechanisms of RhB were thoroughly studied by combining the results of total organic carbon (TOC), DFT and liquid chromatography mass spectrometry (LC-MS).
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Hongxu Liu,Junhao Xie,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Ziwei Lv,Yang Yu,Shulin Sun
The industrial wastewater filtered by water treatment membranes is very complex in practical applications, therefore, it is a challenge to prepare a membrane with large pore size and high flux that can efficiently separate various wastewater containing pollutants of different scales. To solve this problem, an SA-TiO 2 hydrogel-coated PVDF-g-IL composite fibre membrane with super hydrophilicity, anti-pollution, and pH-responsive self-cleaning properties has been designed and prepared by electrostatic spinning and layer-by-layer coating techniques in the present work. The super hydrophilic gel layer on the surface gives the composite membrane efficient separation capability while maintaining rapid passage of the aqueous phase; the underlying PVDF-g-IL fibre membrane is positively charged and removes not only anionic/cationic pollutants by electrostatic repulsion or attraction but also creates an ionic bond with oppositely assigned SA so that the gel layer tightly bond to the base membrane. The PVDF-g-IL@SA-TiO 2 membrane achieves stable and efficient separation of oil-water emulsions and dye wastewaters with a high filtration flux while retaining a retention rate higher than ∼95%. After multiple self-cleaning cycles, the ultra-thin gel layer still offers satisfactory durability with ≈100% flux recovery. This study provides a promising new strategy for designing efficient multiple contaminant separation and simpler self-cleaning membranes.
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Zhanjun Yang,Hao Liu,Mi Li,Xiaoqian Wang,Yang Li,Zhongxuan Han,Ajay V. Singh,Lin Jiang,Andrei Rotaru
This study investigates the combustion characteristics of reactive aluminium alloys in combination with fluoropolymer oxidizers. Aluminium-magnesium (Al-Mg) and aluminium-titanium (Al-Ti) alloys were selected as metallic fuels, while polyvinylidene fluoride (PVDF) was employed as the oxidizer. Composite samples were prepared using two methods: electrostatic spraying (ES) and physical mixing (PM). The ES method yielded samples with a PVDF-coated structure, whereas the PM method produced simple mixtures. The samples and their combustion products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), combustion experiments, and thermal analysis. The results indicate that compared to the PM samples, the ES-coated samples exhibited more effective dispersion of metallic particles, reduced particle agglomeration, increased combustion heat release temperature, decreased maximum flame area and height, and mitigated or eliminated explosive or micro-explosive phenomena during combustion, thereby achieving stable combustion. Additionally, the ES samples demonstrated a significant reduction in the particle size of condensed-phase products after combustion, alleviated sintering and agglomeration, decreased the formation of metal oxides, and minimized residual metallic fuel, allowing for the full release of combustion heat. Thermal analysis revealed that the coating structure of the ES samples lowered the activation energy for the reaction between the metallic fuel and PVDF, thereby enhancing the chemical reactivity.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zhengang Bu,Jianhua Li,Siqi Fang,Yuanlin Zhan,Wenzhuo He,Yibin Huang
The uniform and stable deposition of metal-organic frameworks (MOFs) onto membranes without compromising their performance presents a significant challenge. This study reports the fabrication of a photocatalytic self-cleaning membrane using hydrothermal and photochemical substitution methods. These methods enabled the uniform and stable deposition of β-FeOOH nanorods, m-MIL-100(Fe), and Ag nanoparticles (NPs) not only on the members surface but also throughout the interior of polyvinylidene fluoride (PVDF) membrane pores. The synergistic effect of these materials and their uniform and stable distribution within the PVDF membrane resulted in superior photocatalytic efficacy. The membrane's excellent photocatalytic performance facilitated the degradation of most pollutants, ensuring prolonged usage. Unlike other photocatalytic membranes requiring additional cocatalysts, our membrane degraded over 90% of various dyes without H 2 O 2 , demonstrating a greener usage mode and higher photocatalytic efficiency. The valence band (VB) and conduction band (CB) of β-FeOOH nanorods and m-MIL-100(Fe) were calculated, confirming the existence of a type-II heterojunction for the first time. Free radical trapping experiments identified hydroxyl radicals (·OH) as the primary reactive species in the degradation process. This research provides a novel approach to uniformly and stably load MOFs on membranes, enhancing their properties and offering insights into fabricating multifunctional photocatalytic membranes.
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高影响因子
IONICS
·
2020
·Vol. 26
·期 9
·4489-4497
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IF 2.394
Li Ling,Li Haijuan,Wang Yan,Zheng Shuaizhi,Zou Youlan,Ma Zengsheng
To improve the safety performance of lithium-ion batteries, the research of composite separator with high temperature resistance is one of the strategies. Herein, a poly(vinylidene fluoride-hexafluoropropylene)/cellulose/carboxylic titanium dioxide (PVDF-HFP/cellulose/C-TiO 2 ) composite separator is prepared by the phase inverse method. The composite separator has higher porosity (63.65%) and electrolyte uptake (210.3%) than PP separator, exhibiting good heat resistance that can keep its shape and size under 160 °C for 0.5 h. Additionally, it has a superior ionic conductivity of 1.24–1.49 mS cm −1 and a lower charge transfer impedance at a room temperature, which brings about better cycle and rate performance. Promisingly, the cell assembled with the PVDF-HFP/cellulose/C-TiO 2 composite separator has a high electrochemical working window and a high current charge of ability, and can undergo 10 charge-discharge cycles normally under 120 °C. The PVDF-HFP/cellulose/C-TiO 2 composite separator has promising potentials for high current and voltage charging, which can improve the safety performance of the lithium-ion battery.
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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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Fan Yang,Guoyu Ding,Jin Wang,Zihan Liang,Boru Gao,Mengmeng Dou,Ce Xu,Shuming Li
Mesoporous graphitic carbon nitride (MCN) photocatalyst was blended in polyvinylidene fluoride (PVDF) membrane through immersion-precipitation phase transformation. Various techniques were adopted to characterize the structure and morphology of MCN-PVDF hybrid membrane, which indicated that MCN was successfully integrated in PVDF. The MCN 80 -PVDF membrane exhibited enhanced hydrophilicity and antifouling properties. As the amount of MCN addition increased, the contact angle of membranes decreased from 68.33° to 57.12°, whereas the flux recovery rate increased by 28% as compared to the pristine PVDF. Meanwhile, MCN-PVDF membrane possessed photocatalytic, self-cleaning and antimicrobial activities. The MCN 80 -PVDF membrane was used to degrade cefotaxime (CFX) under sunlight irradiation. After five cycles of experiments, the degradation rate of CFX remained 97.4%. Additionally, MCN 80 -PVDF membrane achieved 3 log of E. coli inactivation under visible light irradiation for 4 h. The photogenerated h + and reactive oxidative species were the primary reason for organics’ degradation and bacterial inactivation. In summary, the prepared hybrid MCN 80 -PVDF membrane with sunlight irradiation exhibited great potential for the treatment of real wastewater .
研究领域:
材料科学
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环境工程
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化学工程
·
水处理
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yunyun Wang,Li Chen,Yinhua Jiang,Xinyan Yang,Jiangdong Dai,Xiaohui Dai,Mingdong Dong,Yongsheng Yan
Applying polyvinylidene fluoride (PVDF) monolith for phosphates removal can improve the operability of the adsorption process compared with some other powder nanomaterials. However, as the commonly used synthesis strategy, non-solvent induced phase separation (NIPS) was deemed not environmentally friendly enough since the dissolution of PVDF often involved volatile organic compounds (VOCs). This article designed a salt sacrificial template method to fabricate a 3D porous PVDF monolith, and then in-situ growth of lamellar La(OH) 3 on the PVDF foam was realized to enhance the adsorption affinity to phosphates pollution. No VOCs were used or released during the whole synthesis process. The adsorption for phosphates was as high as 56.2 mg g −1 , and easy reusability of the novel PVDF monolith was realized. In addition, this PVDF-La(OH) 3 foam exhibited good adsorption properties in both oil and water environments, which implied it could not only adsorb phosphates in actual water samples but also separate oil contaminants from water. All these implied that this PVDF-La(OH) 3 foam could be a potential candidate for large-scale industrial adsorption and separation of phosphates. This PVDF-La(OH) 3 foam could be a potential candidate for large-scale industrial adsorption and separation of phosphates.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Huiting Shan,Jun Liu,Xipeng Li,Yi Li,F. Handan Tezel,Baoan Li,Shichang Wang
Membrane distillation, which can utilize low grade energy, has attracted significant attention recently. However, membrane fouling is a big issue impeding its development and industrialization. Hence, it is essential to prepare amphiphobic membrane for comprehensive anti-fouling performance. Herein, a facile and biomimetic method is explored to design amphiphobic surface with special structure and controllable wettability . Commercial polyvinylidene fluoride (PVDF) was primarily functionalized with polydopamine (PDA) coatings and then nanoscale roughness was introduced on the membrane surface, followed by the fluorination of 1H,1H,2H,2H-perfluorodecanethiol. It is revealed that the amphiphobic property can be accurately controlled by controlling the dosage of Ag + . When the concentration of Ag + is 300 mM, the water and oil contact angle of the optimal membrane can achieve 167.6 ± 0.27° and 136.9 ± 0.4°, respectively, while the water sliding angle is only 3 ± 0.1°, which demonstrates prominent superhydrophobicity and oleophobicity. Furthermore, the amphiphobic membrane exhibits excellent chemical and thermal stability under harsh conditions as well as outstanding comprehensive anti-fouling capacity with higher flux and excellent salt rejection in the long-term direct contact membrane distillation (DCMD) experiments, which shows promising potentials for application in the field of membrane distillation.
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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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2021
·
IF 9.028
Dejun Feng,Yuanmiaoliang Chen,Zhangxin Wang,Shihong Lin
Although membrane distillation (MD) has been identified as a promising technology to treat hypersaline wastewaters, its practical applications face two prominent challenges: membrane wetting and fouling. Herein, we report a facile and scalable approach for fabricating a Janus MD membrane comprising a dense polyvinyl alcohol (PVA) surface layer and a hydrophobic polyvinylidene fluoride (PVDF) membrane substrate. By testing the Janus membrane in direct contact MD experiments using feeds containing a sodium dodecyl sulfate (SDS) surfactant or/and mineral oil, we demonstrated that the dense Janus membrane can simultaneously resist wetting and fouling. This method represents the simplest approach to date for fabricating MD membranes with simultaneous wetting and fouling resistance. Importantly, we also unveil the mechanism of wetting resistance by measuring the breakthrough pressure and surfactant permeation (through the PVA layer) and found that wetting resistance imparted by a dense hydrophilic layer is attributable to capillary pressure. This new insight will potentially change the paradigm of fabricating wetting-resistant membranes and enable robust applications of MD and other membrane contactor processes facing challenges of pore wetting or/and membrane fouling.
研究领域:
化学工程
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材料科学
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环境工程
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高影响因子
JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Shijie Lu,Xiaorong Chu,Chunli Li,Zhikun Zhao,Jianxiong Xiao,Borong Wu,Daobin Mu
High ionic conductivity and good interface compatibility have always been two major bottlenecks for solid-state electrolytes. Herein, a composite electrolyte membrane comprising poly (propylene carbonate), PVDF-HFP and Li 6 · 3 La 3 Zr 1 · 4 Ta 0 · 6 O 12 is successfully prepared via electrospinning. With the assistance of succinonitrile, the synthesized solid-state electrolyte exhibits high ionic conductivity (1.32 × 10 −3 S cm −1 at room temperature), oxidation potential up to 4.5 V vs Li/Li + and high Li + transference number (0.81). This desirable performance is attributed to the combination of PPC with good Li + conduction ability and PVDF-HFP with excellent mechanical properties, forming a continuous transport framework within the electrolyte. The introduced active fillers and small molecular additive not only benefit to fast Li + mobility, but also reinforce the stability towards Li metal. Li symmetric cell using the solid-state electrolyte can last for 800 h at a current density of 1.0 mA cm −2 with a low overpotential. The NCM811 cell using the electrolyte membrane shows high initial discharge specific capacity (184.3 mAh g −1 at 1 C) and good capacity retention (80.1% after 300 cycles at 30 °C).
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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纳米技术
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingshun Wang,Yongquan Zhang,Zengxu Chen,Shuo Fan,Qihui Zhang,Yue Zhang,Tiandong Zhang,Changhai Zhang,Qingguo Chi
Polymer electrolytes have become widely popular on account of their low expenses, reduced weight, simple processing, and excellent safety features. However, polymer electrolytes have yet to find use in commercial batteries because of their limited mechanical durability and poor ionic conductivity . In this paper, an ultra-stable cycles and interfaces blending polymer electrolyte (BPE) suitable for all solid-state Li metal batteries was prepared by blending three polymers: polymethyl methacrylate (PMMA), polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), and polyethylene oxide (PEO). Microstructure characterization showed numerous amorphous areas with strong interfacial strength of the BPE. The BPE3 exhibited a maximum of 15.65 MPa in tensile strength. BPE2 have excellent electrochemical performance, such as wide electrochemical windows (up to 4.7 V vs Li/Li + ), high lithium ion transference numbers (up to 0.75), high ion conductivity (up to 1.87 × 10 -4 S cm −1 at 60 °C), and excellent interface stability. By assembling all state-solid LiFePO 4 /BPE2/Li batteries for electrochemical testing, BPE2 exhibit high electrochemical characteristics. BPE2 discharge specific capacity is as high as 154.7 mAh g −1 at 1C. The BPE2 underwent 200 cycles at 0.5C and 400 cycles at 1C, with capacity retention rates of 95.7 % and 96.6 %, respectively. BPE is a promising electrolyte candidate for flexible lithium metal batteries.
研究领域:
材料科学
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电化学
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电池技术
·
聚合物科学
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高影响因子
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