JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Chaojie Pang,Jiage Liu,Rui Peng,Yingying Guo,Zhiyong Li,Huiyong Wang
Titanium disulfide nanosheets (TiS 2 NSs) have attracted considerable research interest due to their eco-friendliness and outstanding electrical transport properties. However, the large scale preparation of TiS 2 NSs usually is plagued by the employ of poisonous solvents and low production. Herein, we develop a green, highly efficient and scalable tactic to exfoliate bulk TiS 2 powders in aqueous ionic liquids solutions under ambient conditions. This result shows that the exfoliation yield can reach 57.6 %, which surpasses the most values for the liquid-phase exfoliation of TiS 2 reported in literatures. The thickness of TiS 2 NSs is mainly in the range of 1 nm to 2 nm, and the lateral dimension is up to a few hundreds of nanometers. The molecular geometry and anionic alkalinity of the ionic liquids play key roles in the delamination and stability of TiS 2 NSs. In addition, TiS 2 NSs have been used as catalysts in the electrocatalytic CO 2 to CO conversion with the faradaic efficiency of 68.7 %, which is six times that by the bulk TiS 2 powder. Thus, the liquid phase delamination approach reported in this work has a great potential in manufacturing 2D layer materials for high activity electrocatalysis.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Gui-Rong Zhang,Cong Yong,Liu-Liu Shen,Hui Yu,Kai Brunnengräber,Timo Imhof,Donghai Mei,Bastian J. M. Etzold
Non-precious metal catalysts show great promise to replace the state-of-the-art Pt-based catalysts for catalyzing the oxygen reduction reaction (ORR), while their catalytic activity still needs to be greatly improved before their broad-based application. Here, we report a facile approach to improving the performance of zeolitic imidazolate framework-derived carbon (ZDC) toward the ORR by incorporating a small amount of ionic liquid (IL). The IL would preferentially fill the micropores of ZDC and greatly enhance the utilization of the active sites within the micropores, which are initially not accessible due to insufficient surface wetting. It is also disclosed that the ORR activity in terms of kinetic current at 0.85 V depends on the loading amount of the IL, and the maximum activity is obtained at a mass ratio of IL to ZDC at 1.2. The optimum stems from the counterbalance between the enhanced utilization of the active sites within the micropores and the retarded diffusion of the reactants within the IL phase due to its high viscosity.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Bingtong Chen,Yingying Cao,Jing Wang,Yiwei Zhu,Jian Kang,Hui Wang
To ensure the safety of drugs in clinical use and avoid side effects, the impurity content should be strictly controlled. Artemisitene (ARE) has quite similar structure to that of the antimalarial artemisinin, and thus is difficult to be removed from the target drug. The traditional column chromatography method to purify artemisinin has low separation efficiency and needs lots of organic solvents. In this work, functional ionic liquid (IL), 1-(trimethoxysilyl) benzene-3-vinylimidazolium chloride, modified silica materials were synthesized. Composition of the functional materials were characterized by energy dispersive spectroscopy, FT-IR, and X-ray photoelectron spectroscopy. It was indicated that the designed ionic liquid was successfully grafted onto SiO 2 . Adsorption capacity of the prepared ionic liquid-based material for artemisinin and artemisitene was evaluated, and it was demonstrated that adsorption of ARE by the functional material was a quick process, and the adsorption kinetics followed the Elovich Model. This kind of IL@SiO 2 material exhibited excellent performance in selective separation of artemisitene from artemisinin. Mechanism exploration by spectroscopic analysis revealed that π-π conjugated interactions between the unsaturated bond (the C=C bond and aromatic ring) in the ionic liquid and artemisitene enhanced the molecular recognition capability of IL@SiO 2 for ARE, resulting in selective separation of these two structurally analogues.
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Batteries-Basel
·
2023
·Vol. 9
·期 2
·141
·
IF 4
Xiaorui Wang,Shuang Wang,Dan Liang,Yinghe Cui,Xiaodong Wang,Zhipeng Yong,Fengxiang Liu,Zhe Wang
Based on amino polybenzimidazoles with flexible hydrophilic side chains (AmPBI-MOE) and polymeric ionic liquid (PIL), a series of composite membranes (AmPBI-MOE-PIL-X) were fabricated for vanadium redox flow battery applications. Here, 1-Bromo-2-(2-methoxyethoxy)ethane was grafted onto amino polybenzimidazole (AmPBI) by the method of halogenated hydrocarbons, and PIL was synthesized from ionic liquids by in situ radical polymerization to build a hydrogen-bonded cross-linked network within the film. The hydrophilic side chain improves the proton conductivity. With the increase in ionic liquids, the vanadium transmittance and the proton conductivity increase. The AmPBI-MOE-PIL-5 membrane not only exhibits a vanadium ions permeability of 0.88 × 10−9cm2min−1, which is much lower than Nafion117 (6.07 × 10−8cm2min−1), but also shows a very excellent blocking ability for vanadium ion. The AmPBI-MOE-PIL-5 membrane shows excellent performances at 60 mA cm−2, with VE of 87.93% and EE of 82.87%, both higher than that of Nafion117 membrane in VRFB.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Baoying Wang,Junying Yan,Huangying Wang,Ruirui Li,Rong Fu,Chenxiao Jiang,Victor Nikonenko,Natalia Pismenskaya,Yaoming Wang,Tongwen Xu
The development of low-resistance ion-exchange membranes enabling fast transport of large-sized metallic anions is extremely desirable for the treatment of metal containing effluents using electrodialysis (ED). Herein, mechanically stable ionic liquid-based pore-filling anion-exchange membranes (PFAEMs) with excellent transport performance for large-sized metallic anions were fabricated by impregnating porous polytetrafluoroethylene with ionic liquid (IL) tricapryl(methyl) ammonium chloride, poly(ethylene glycol) dimethacrylate and poly(vinylidene fluoride-co-hexafluoropropylene). The superior compatibility between the ILs and polymeric chains ensured the stable existence of quaternary ammonium groups, thus enabling fast metallic anion migration along the continuous pathway in the membrane matrix at a low current density. The prepared PFAEM exhibited a dramatically greater flux of HCrO 4 − (90.7 μmol m −2 s −1 ), which was 9.5 and 4.4 times higher than the flagship commercial Neosepta@ASE and Neosepta@AMX membranes, respectively. The area resistance of PFAEM (3.4 Ω cm 2 ) was found to be 3.4 and 2.0 times lower than those of the Neosepta@ASE and Neosepta@AMX membranes, respectively. Besides, the preeminent transport performance of PFAEM to other metal coordination anions revealed the universality of the prepared membrane. Moreover, the extremely high limiting current density and satisfactory long-term stability of PFAEM manifested bright prospects for realizing efficient metal separation in industrial-scale applications.
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MATERIALS CHEMISTRY AND PHYSICS
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2019
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IF 2.781
Bin Dong,Wen-Jing Wang,Wei Pan,Guo-Jun Kang
Covalent organic frameworks (COFs) are usually synthesized under solvothermal conditions in a mixture of high-boiling organic solvents in a sealed system. By using a room temperature ionic liquid (IL) as a solvent, we presented the preparation of two-dimensional (2D) keto-enamine-linked COFs in an open container at ambient pressure. The as-synthesized 2D keto-enamine-linked COFs have ordered open channels and so the IL can be completely removed from the pores to provide the sole formation of crystalline 2D COFs. Not only the imidazolium-based IL acted as both solvent and catalyst, it was also recycled for further use without activity loss.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Li-fang Gao,Xin Lin,Xin Hai,Xu-wei Chen,Jian-hua Wang
A highly sensitive and selective detection of p-phenylenediamine (PPD) is achieved by a fluorescence sensor, which is constructed by encapsulating the hydrophobic fluorescent 1-pyrenecarboxaldehyde (Py-CHO) into a polymeric ionic liquid (PIL)-based amphiphilic block copolymer (BCP) micelle. The amine–aldehyde condensation reaction between PPD and Py-CHO leads to the fluorescence quenching of Py-CHO, giving rise to the basis for the quantitative detection of PPD. The core cavity of the micelle formed by the self-assembly of PIL provides an excellent hydrophobic environment for the accommodation of fluorescent Py-CHO, offering significant improved sensitivity and selectivity for PPD detection. The amount of PIL in fabricating the amphiphilic BCP micelle, the BCP-Py-CHO micelle concentration, and the detection pH condition are investigated to obtain the best performance of this sensor. The accurate detection of PPD is achieved in the range of 0.02–10 μmol L–1 under optimal conditions, and the detection limit is 0.007 μmol L–1 (3σ/s). The developed sensor is successfully applied to the determination of PPD contents in hair dyes, spiked water, and urine samples.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Zhuangzhi Sun,Lu Yang,Dan Zhang,Wenlong Song
A flexible nano-biocomposite artificial muscle based on a mesoporous renewable cellulose/ionic liquid (IL-Cel) electrolyte membrane with high porosity of 91.31% was developed in this paper. The IL-Cel electrolyte membrane, fabricated by a solution-phase separation process, exhibited absolute advantages in flexibility and ion transfer efficiency, so IL-Cel regenerated actuators exhibited significant enhancement in the deflection displacement and force, which were 4 and 2 times greater than traditional DMAC/Li-dissolved cellulose (Dm-Cel)-based actuators. Good flexibility (from the tensile test) and low surface resistance (within 100 Ω, from SEM) were also attained by actuators composed of an IL-Cel electrolyte membrane without regenerated substances (from FT-IR and XRD). Actuators with a solid-state electric double layer capacitor using multi-wall carbon nanotubes as electrodes and [Emim]Ac-Cel as the polymer electrolyte, exhibited the highest specific capacitance of 890 mF g −1 at 20 mV s −1 , a lower internal resistance (0.098 Ω g −1 ) at range of 10 5 Hz–0.01 Hz, and the lowest power density (149 W kg −1 ) at 10 A g −1 . Results indicated that cathode deflection was achieved by the action of van der Waals force and anion volumetric strain. These findings suggest that the developed mesoporous IL-Cel based actuators hold great promise in the further study of high-performance actuators.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Qian Zeng,Zhen Song,Hao Qin,Hongye Cheng,Lifang Chen,Ming Pan,Yi Heng,Zhiwen Qi
Butyl hexanoate (BuHE) is currently synthesized through the Fischer esterification with mineral acid as catalyst, which suffers from the problems of side reaction, difficult recycling, and corrosion. To overcome these disadvantages, ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIm][HSO 4 ]) is employed as dual catalyst-solvent for the esterification of hexanoic acid (HeAc) with n-butanol (BuOH) in a reactive extraction process. The dual functions of [BMIm][HSO 4 ], extraction and catalysis, were confirmed by liquid-liquid equilibria for the two systems {[BMIm][HSO 4 ] + HeAc + BuHE} and {[BMIm][HSO 4 ] + BuOH + BuHE}, and by the comparison of esterifications with or without [BMIm][HSO 4 ], respectively. Moreover, the optimal reactive extraction conditions for BuHE formation were obtained. Finally, the possible mechanism of intensification of [BMIm][HSO 4 ] on BuHE formation in reactive extraction process was proposed.
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ACS Applied Energy Materials
·
2019
·
IF 0
Xiaoli Zhan,Jiawen Zhang,Mingzhu Liu,Jianguo Lu,Qinghua Zhang,Fengqiu Chen
High-voltage electrode materials are beneficial for developing high-power-density lithium-ion batteries. The anodic voltage stability of electrolytes is a major challenge for high-voltage lithium batteries. Herein, a polysiloxane-based solid polymer electrolyte is fabricated by grafting ionic liquid and poly(ethylene oxide) chains onto flexible polysiloxane backbone. An ionic liquid with a strong electron-withdrawing nitrile group and a positively charged imidazole possesses good resistance against anodic oxidation, which endows the solid polymer electrolyte with a wide electrochemical window. The electrolyte integrates advantages of ionic liquid and poly(ethylene oxide) exhibiting a high ionic conductivity (3.56 × 10–4 S cm–1 at room temperature) and excellent resistance to dendrite growth. In addition, both Li/LiFePO4 and high-voltage Li/LiNi0.5Mn1.5O4 cells with the as-prepared solid polymer electrolyte show excellent cycling performance and superior rate capability at 30 °C. Thus, the modified polysiloxane-based electrolyte is a promising electrolyte candidate for next-generation high-energy-density batteries.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Furui Ma,Zengqi Zhang,Wenchao Yan,Xiaodi Ma,Deye Sun,Yongcheng Jin,Xiaochun Chen,Kuang He
Polymerized ionic liquids (PILs) have several advantages over ionic liquids, such as easy handling, good electrochemical performance, and chemical compatibility. In this research, a solid-state electrolyte composite membrane was successfully fabricated by using an imidazolium-based polymerized ionic liquid as polymer matrix, a kind of porous fiber cloth as rigid frame, and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as lithium salt. The ionic conductivity of the composite electrolyte with 2.0 mol/kg LiTFSI is 7.78 × 10–5 S cm–1 at 30 °C and reaches 5.92 × 10–4 S cm–1 at 60 °C, which is considered a satisfactory value for potential application in lithium-ion batteries. The specific discharge capacity of the LiFePO4/Li cell with as-prepared composite electrolyte is 138.4 mAh g–1, and 90% of the discharge capacity is retained after 250 cycles at 60 °C. In order to further improve the conductivity, Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramic electrolyte particles are dispersed in a PIL polymer matrix to prepare the PIL-LiTFSI-LATP composite electrolyte. LiFePO4/Li cells using PIL-LiTFSI-LATP (10 wt % LATP) as a solid-state electrolyte exhibit excellent rate performance and high capacity retention (close to 97% after 250 cycles at 60 °C). This work may provide a unique way to prepare a new series of electrolytes for high-performance solid-state lithium batteries.
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Chemistry-An Asian Journal
·
2019
·Vol. 14
·期 11
·2008-2017
·
IF 3.698
Cancan Wang,Qi Li,Jiangna Guo,Yongyuan Ren,Juewen Zhang,Feng Yan
Graphical Electrospun carbon nanofibers based on metal-containing ionic liquids are prepared to boost oxygen reduction reaction in Zn–air batteries. Practical applications of Zn–air batteries are usually limited by sluggish kinetics of oxygen reduction reaction. Replacing Pt-based catalysts with convenient, efficient and low-cost materials to boost oxygen reduction reaction is highly desirable. Herein, a class of Fe−N co-doped carbon nanofibers is successfully synthesized by pyrolysis of polyacrylonitrile/metal-containing ionic liquid-based electrospun films. The ionic liquids act as porogen to provide multiscale pores as well as activator to bring carbon nanofibers active sites. The catalyst possessing appropriate active sites and unique 3D porous architecture exhibits remarkable long-term stability and electrocatalytic activity. Particularly, the catalyst maintains a shape of membrane after carbonization, manifesting its direct use as air electrode without binders. It is notable that an all solid-state Zn–air battery based on the carbon nanofibers exhibits good flexibility, indicating its promising application as wearable devices.
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