ACS Applied Energy Materials
·
2021
·
IF 6.024
Dandan Zhu,Hui Fan,Hongyu Wang
LiPF6-propylene carbonate (PC) solutions show some compatibility with the graphite positive electrode in dual-ion batteries. The relationship between the anion storage capacity and LiPF6 concentration is investigated by galvanostatic charge–discharge tests. Ex situ X-ray diffraction (XRD) measurements are carried out on graphite electrode recovered from Li/graphite cells at the end of charge to probe the storage situation of PC-solvated PF6– inside graphite electrode. In situ XRD measurements on Li/graphite cells are performed to trace the crystal structural changes of anion–graphite intercalation compounds. Electrochemical quartz crystal microbalance (EQCM) measurement is conducted on graphite electrode to evaluate the transport of solvent during the anion storage. Nuclear magnetic resonance (NMR) and infrared (IR) spectroscopic studies on the solutions reveal the interactions between ions and PC solvent. The electrochemical performance of graphite is correlated with solvation state of LiPF6-PC solution.
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
MOLECULES
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2013
·Vol. 18
·期 11
·13910-13919
·
IF 2.428
Wen-Jian Xia,Zong-Bo Xie,Guo-Fang Jiang,Zhang-Gao Le
An environmentally-friendly, enzyme-promoted procedure for the Henry reaction was first studied using water-in-[Bmim][PF6] microemulsions as reaction medium. The Amano acylase fromAspergillus oryzaeshowed better catalytic activity for the addition reactions of nitromethane with a series of aromatic aldehydes, and a highest yield of 90% was obtained.Keywords:Henry reaction;acylase;water-in-[Bmim][PF6] microemulsion;enzyme promiscuity
研究领域:
生物化学
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环境科学
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DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2019
·
IF 3.298
Qianjun Liu,Jiepeng Tang,Di Chen,Yangmei Zhou,Qintie Lin,Xiaoguo Ma,Min Zhang,Huawen Hu
To detect, identify, and quantify the polycyclic aromatic hydrocarbons (PAHs) released into the environment, the PAHs need to be isolated from the soil matrix. In this work, a modified quick, easy, cheap, efficient, rugged and safe (QuEChERS) method with ionic liquid was combined with liquid chromatography to identify 16 selected PAHs in soil. Ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim]PF 6 ) was applied as an extractant component to enhance the process. The [Hmim]PF 6 content in acetonitrile (ACN) was optimized. The [Hmim]PF 6 modified QuEChERS method has the advantages defined by its name and a similar recovery to other extraction methods reported in the literature. Adding [Hmim]PF 6 may eliminate the co-extract proportion and achieve a more effective extraction. Compared with ACN alone, the matrix effect (ME) of ACN containing 5% [Hmim]PF 6 was reduced by approximately 35%. Additionally, the ME of using ACN containing [Hmim]PF 6 without a clean-up procedure was similar to that of using ACN followed by a clean-up procedure. The recoveries of the QuEChERS method implemented with [Hmim]PF 6 ranged from 75.19% to 100.98%. The limits of detection (LOD) and limits of quantification (LOQ) ranged from 0.86 to 4.51 µg/kg and from 2.87 to 15.13 µg/kg, respectively.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 7
·070513
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IF 3.721
Dandan Zhu,Yuhao Huang,Lei Zhang,Hui Fan,Hongyu Wang
PF6− intercalated graphite compounds have found promising applications in dual-ion batteries. However, the anion storage mechanisms of graphite positive electrode in different organic solvents have not been well understood yet, especially in the mixed solvents. In this report, PF6− storage behavior in graphite electrode in 1 M LiPF6-GBL/EMC solutions is studied by conventional electrochemical tests like galvano-static charge-discharge and cyclic voltammetry at first. Then the combined electrochemical in situ characterizations including both in situ X-ray diffraction and electrochemical quartz crystal balance on graphite electrodes are carried out to trace their changes of crystal structure and mass during the anion storage. It is discovered that with EMC addition in the solutions, EMC rather than GBL will preferentially solvate with PF6− anion as the intercalant species. Moreover, ionic conductivity values and NMR spectra of the solutions were measured to investigate the interactions between ions and solvents inside, and are correlated with the performance of graphite electrode.
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
POLYMER BULLETIN
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2025
·
IF 4
Zhang Chengpeng,Bei Pengzhi,Liu Hongjing,Zhao Xu,Shi Meiling,Jing Xiaochun,Li Zhao,Yao Hui
A novel porous liquid, M2070-UiO-66-OH@[BMim][PF 6 ], has been synthesized using zirconium-based metal–organic framework (UiO-66-OH), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMim][PF 6 ]) and polyetheramine M2070. To enhance the CO 2 separation performance, M2070-UiO-66-OH@[BMim][PF 6 ] was incorporated as a filler into a mixed matrix membrane (MMM) using polyether block amide (Pebax-1657) as the membrane matrix. The properties of the synthesized M2070-UiO-66-OH@[BMim][PF 6 ] and the resulting MMMs have been characterized through FTIR, TGA, DSC, and SEM analyses. The results of porous liquid stability revealed that grafting polyetheramine M2070 onto the surface of UiO-66-OH@[BMim][PF 6 ] significantly increased the steric hindrance, thereby preventing agglomeration within the membrane. Additionally, the functional groups (amino and ether) present in M2070-UiO-66-OH@[BMim][PF 6 ] contributed to an increased number of active sites for CO 2 adsorption, facilitating enhanced CO 2 transport through the membrane. Compared to the Pebax membrane, the MMM containing 3% M2070-UiO-66-OH@[BMim][PF 6 ] exhibited significantly improved CO 2 permeability of 104.07 Barrer (an increase of 73.22%) and CO 2 /N 2 selectivity of 92.37 (an increase of 148.95%) at 30 °C and 0.3 MPa, surpassing the 2008 Robeson upper bound. These findings suggest that M2070-UiO-66-OH@[BMim][PF 6 ] is a highly promising additive for the fabrication of mixed matrix membranes with superior CO 2 separation performance. Graphical abstract A porous liquid, (M2070-UiO-66-OH@[BMim][PF 6 ]) has been prepared using UiO-66-OH@[BMim][PF 6 ] as the core and polyetheramine M2070 as the canopy. Afterwards, M2070-UiO-66-OH@[BMim][PF 6 ] has been added to the Pebax matrix to prepare M2070-UiO-66-OH@[BMim][PF 6 ]/Pebax mixed matrix membranes, which have been subjected to gas separation studies.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
He Yang,Tingting Qin,Xinyan Zhou,Yu Feng,Zizhun Wang,Xin Ge,Nailin Yue,Dabing Li,Wei Zhang,Weitao Zheng
Large anions exhibit slow diffusion kinetics in graphite cathode of dual-ion batteries (DIBs); particularly at high current density, it suffers severely from the largely-reduced interlayer utilization of graphite cathode, which as a bottleneck limits the fast charge application of DIBs. To maximize interlayer utilization and achieve faster anion diffusion kinetics, a fast and uncrowded anion transport channel must be established. Herein, Li + was pre-intercalated into the graphite paper (GP) cathode to increase the interlayer spacing, and then hosted for the P F 6 - anion storage. Combined with theoretical calculation, it shows that the local interlayer spacing enlargement and the residual Li + reduce the anion intercalation energy and diffusion barrier, leading to better rate stability. The obtained GP with Li + pre-intercalation (GP-Li) electrode exhibits a discharge capacity of 23.1 mAh g −1 at a high current of 1300 mA g −1 . This work provides a facile method to efficiently improve the interlayer utilization of graphite cathode at large currents.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Fan Li,Yong-Feng Shen,Bin He,Wen-Cui Li
Dual-ion batteries are attracting much attention due to the joint participation of anions and cations in the energy storage process. However, this unique battery configuration imposes high demands on the cathode, which typically presents an inferior rate performance. Herein, we employ graphite in different microcrystalline sizes as cathodes, associated with high concentration electrolyte to construct sodium dual-ion batteries. The results of in-situ XRD and Raman evidence that the surface effect is enhanced by suitably small graphite microcrystals, where a greater surface involvement affords more electro-activated regions for the ions. Furthermore, the analysis of sputtering XPS confirms that the PF6- is accompanied by the co-intercalation of Na+ into cathodes by constructing the model of concentration effect, thus accelerating the kinetic process. In conclusion, the co-intercalation of PF6- together with Na+ is demonstrated under the influence of enhanced surface concentration effect in cathodes, and thus the cathodes exhibit a superior rate performance with a capacity of 103.6 mAh g-1 at a rate of 2 C and a rate retention of 94.8% even at 50 C. This work provides new insights to explain the mechanism of ion intercalation in dual-ion batteries and offers a perspective for the construction of high energy storage systems.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 17
·e202300493
·
IF 8.4
Yong-Feng Shen,Meng-Meng Zhang,Dong Yan,Jia-He Lv,Tao Wu,Bin He,Wen-Cui Li
Graphical From petroleum coke : Soft carbon cathode with superb rate performance for dual-ion batteries is presented. In situ XRD and Raman show that PF 6 − anions form stage-1 graphite intercalation compounds in the surface region, and directly stage-2 in the bulk, skipping the conversion from stage-4 to stage-2 due to the benefit of surface effect. The improved reaction kinetics results in better rate performance than that of conventional graphite. Dual-ion battery is a new type of battery in which both anions and cations participate in the energy storage process. However, this unique battery configuration imposes high requirements on the cathode, which typically presents a poor rate performance due to the sluggish diffusion dynamics and intercalation reaction kinetics of anions. Herein, we report petroleum coke-based soft carbon as the cathode for dual-ion batteries, exhibiting a superior rate performance with a specific capacity of 96 mAh g −1 at a rate of 2 C and 72 mAh g −1 remained even at 50 C. In situ XRD and Raman demonstrate that the anions can directly form lower-stage graphite intercalation compounds during the charge process owing to the surface effect, skipping the long evolutionary process from higher to lower stage, thus significantly improving the rate performance. This study highlights the impact of the surface effect and provides a promising perspective for dual-ion batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2023
·
IF 6.8
Ruosong Xie,Ziying Li,Guangfei Qu,Yingjie Zhang,Chenpeng Wang,Yingda Zeng,Yiting Chen
Cadmium has been classified as a kind of human carcinogens, and has a strong mobility in the water environment and this can result in serious harm to human health and environmental safety. Here, a new selective and efficient extraction-recovery strategy for Cd purification is provided by using C 6 MimT/[C 6 Mim]PF 6 as the green extractant. Due to the high compatibility between C 6 MimT and [C 6 Mim]PF 6 , C 6 MimT-Cd was efficiently separated from the aqueous phase. When the concentration of Cd(II) was 1000 mg/L, the extraction rate could reached 99.9 %. By comparing [C 6 MIm]BF 4 with [C 6 MIm]PF 6 , the hydrophobicity restrained the ion exchange between cation and Cd and significantly reduced the loss of extractant. The extracted Cd(II) was separated in the form of precipitation after stripping. The extraction system of C 6 MimT/[C 6 Mim]PF 6 was stable after several extraction-stripping cycles. The extraction of Cd(II) by C 6 MimT/[C 6 Mim]PF 6 system mainly realized by forming a neutral and extractable cadmium complexes between Cd(II) and thione. Based on the natural complexation mechanism between metal and C 6 MImT, Cd exists as obvious competitive advantage in coordination with C 6 MimT compare to Pb, Zn, Mg, Cr, Fe. This work overcomes the problems of extractant loss and organic pollution caused by volatile or ion exchange, which can only reduce environmental hazards, but also promote the recovery of cadmium and other valuable resources.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Mingyu Zhang,Jin Zhu,Yunyan Gai,Mengshuang Li,Yuepeng Cai,Dongsheng Lu
Enhancing the operating voltage (>4.3 V vs Li/Li+) of cathodes is a critical strategy for increasing the energy density of lithium-ion batteries (LIBs). However, in high-voltage LIBs employing conventional carbonate-based electrolytes, solvent-dominated electrode–electrolyte interfacial reactions hinder the formation of a stable cathode–electrolyte interface, resulting in rapid capacity degradation. In this work, suberonitrile (SUN) is used as an additive to regulate the structure of a commercial carbonate electrolyte (1 M LiPF6+ethylene carbonate (EC)/ethyl methyl carbonate (EMC) (3/7, v/v)), and the electrolyte containing SUN has a localized high-concentration electrolyte-like structure. Because the attraction of Li+-SUN is weaker than that of Li+-EC and Li+-EMC, while the attraction of PF6–-SUN is stronger than that of PF6–-EC and PF6–-EMC, SUN closely contacts PF6– by squeezing out the solvent molecules near PF6–, which pulls the PF6– into the Li+ solvation sheath. This unique electrolyte configuration shifts the interfacial chemistry from solvent-derived to SUN/anion-dominated, enhancing the stability of the electrode/electrolyte interface in high-voltage LiNi0.5Mn1.5O4/graphite cells. Consequently, the cell employing the 1.0 wt % SUN-containing electrolyte demonstrates a 14.3% improvement in capacity retention after 200 cycles at a 0.3C rate compared to that with the baseline electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 304
·期 4
·1800791
·
IF 3.038
Haiyan Li,Yingjie Ma,Yexiang Cui,Zhike Li,Huaiyuan Wang
Multilayer wall microcapsules efficiently loaded with a lubricant (ionic liquid [BMIm]PF 6 ) are successfully synthesized via a combination of interfacial and in situ polymerization reactions based on lignin nanoparticle–stabilized Pickering emulsion templates. The resulting microcapsules are spherical in shape, with an ideal structure of a rough outer surface and a smooth inner surface. The mean diameter and wall thickness of the resultant microcapsules are 52 ± 18 µm and 3–6 µm. The core fraction is ≈71.29 wt%. Compared with the pure epoxy resin, the friction coefficient of self-lubricating composites decreases by 83.6% (from 0.55 to 0.09) and the wear rate decreases by 218 times (from 76.8 × 10 −14 to 0.352 × 10 −14 m 3 N −1 m −1 ) by incorporating 20 wt% of the resultant microcapsules into the epoxy resin. It is demonstrated that [BMIm]PF 6 , a more efficient lubricant, release from the microcapsules during the friction process produced a boundary lubricating film. The bipolar property of [BMIm]PF 6 makes the lubricating film firmer, which can efficiently prevent direct contact between the resin matrix and counterface. Furthermore, the rough poly(urea-formaldehyde) outer surface of multilayer microcapsules brings in an improved interface property between the microcapsules and resin matrix.
研究领域:
材料科学
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化学工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yingjie Ma,Zhike Li,Huaiyuan Wang,Haiyan Li
Polyurethane (PU) microcapsules containing [BMIm]PF 6 as a lubricant have been fabricated by interfacial polymerization. The stabilizing effect of 10 kinds of emulsifiers towards [BMIm]PF 6 ionic liquid have been delineated. A Pickering emulsion stabilized by lignin showed the best emulsification effect on highly viscous [BMIm]PF 6 . The types and reactivities of monomers have an important influence on the formation of microcapsules. Three kinds of isocyanate (IPDI, MDI, TDI) were reacted with diamines or diols to prepare the PU microcapsules in this work. The optiaml [BMIm]PF 6 @PU microcapsules were obtained when using IPDI and TETA as monomers , under conditions of 5,000 rpm emulsifying rate, 0.5 wt% concentration of lignin Pickering emulsion , and a 3:1 mass ratio of [BMIm]PF 6 /IPDI. The synthesized microcapsules have a regular and compact spherical structure, smooth outer, and inner surfaces with a mean diameter of 43 ± 15 µm, and a thickness of 3.8 µm. The core content of [BMIm]PF 6 @PU microcapsules was determined as >70%, and the initial decomposition temperature was 300 °C. The [BMIm]PF 6 ionic liquid shown excellent lubricating property, ultralow friction coefficient (decreased by 72.7%) and wear rate (decreased by 160 times) were obtained by embedding 30 wt% microcapsules into epoxy compared with pure epoxy.
研究领域:
材料科学
·
化学工程
·
高分子化学
·
润滑技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）