Polymers
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2020
·Vol. 12
·期 2
·297
·
IF 3.426
Haiyan Du,Zemin Wu,Yuyu Xu,Shaoze Liu,Huimin Yang
In this work, solid-state polymer supercapacitor (SSC) was assembled using poly(3,4-ethylenedioxythiophene/carbon paper (PEDOT/CP) as an electrode and ionic liquid (1-butyl-3-methylimidazole tetrafluoroborate)/polyvinyl alcohol/sulfuric acid (IL/PVA/H2SO4) as a gel polymer electrolyte (GPE). The GPE was treated through freezing–thawing (F/T) cycles to improve the electrochemical properties of PEDOT SSC. Cyclic voltammetry (CV), galvanostatic charge–discharge measurements (GCD) and electrochemical impedance spectroscopy (EIS) techniques and conductivity were carried out to study the electrochemical performance. The results showed that the SSC based on ionic liquid GPE (SSC-IL/PVA/H2SO4) has a higher specific capacitance (with the value of 86.81 F/g at 1 mA/cm2) than the SSC-PVA/H2SO4.The number of F/T cycles has a great effect on the electrochemical performance of the device. The energy density of the SSC treated with 3 F/T cycles was significantly improved, reaching 176.90 Wh/kg. Compared with the traditional electrolytes, IL GPE has the advantages of high ionic conductivity, less volatility, non-flammability and wider potential window. Moreover, the IL GPE has excellent elastic recovery and self-healing performance, leading to its great potential applications in flexible or smart energy storage equipment.Keywords:poly(3,4-ethylenedioxythiophene);1-butyl-3-methylimidazolium tetrafluoroborate;gel polymer electrolyte;solid state supercapacitor
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ACS Applied Polymer Materials
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2020
·
IF 0
Xu Ou,Yongyuan Ren,Jiangna Guo,Yingjie Zhou,Yinghui Yuan,Qinbo Liu,Feng Yan
It is highly challenging to separate stabilized water/oil emulsions with sizes below 20 μm. Here, we propose a simple and scalable process via the in situ grafting of ZIF-8 nanoparticles and a poly(ionic liquid) (PIL) onto a commercial cotton cloth (CC) fabric. Switchable wettability between superhydrophilicity/underwater superoleophobicity and superhydrophobicity/superoleophilicity was easily realized via the anion exchange of the PIL. ZIF-8 nanoparticles effectively improved the superhydrophilicity and superolelphilicity of ZIF-8@PIL-grafted cotton cloth (CC-ZIF-PIL), while also performing the dual functions of the separation of oil-in-water (O/W) and water-in-oil (W/O) emulsions. Accordingly, effective water/oil emulsion separation with a high efficiency (η > 99%), selectivity, stability, and durability was obtained using the CC-ZIF-PIL. These features indicate that CC-ZIF-PIL has promising application in switchable water/oil emulsion separation devices.
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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2020
·
IF 3.706
Panpan Zhang,Lihua Kang,Yibin Tong,Chunmei Deng,Mingyuan Zhu,Bin Dai
The ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) was immobilized on zirconia-modified silica, and the resulting BMIMPF6/ZrO 2 –SiO 2 catalysts were used in oxidative desulfurization (ODS) reactions. Experimental results revealed that 10% BMIMPF6/ZrO 2 –SiO 2 exhibited the highest catalytic activity. The properties of the catalysts were studied by Fourier-transform infrared spectroscopy, X-ray diffraction, temperature-programmed desorption, transmission electron microscopy and X-ray photoelectron spectroscopy. Furthermore, the acidities and dispersion of the catalysts were investigated by temperature-programmed desorption and elemental mapping. The desulfurization rate was 99.8% at the optimum reaction conditions of 0.08 g catalyst, 323 K, and O/S = 6, for 2 h. After seven reuse cycles, the catalyst activity was only decreased to 94.1%. Therefore, BMIMPF6/ZrO 2 –SiO 2 is promising as an industrial catalyst for the ODS process.
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ENERGY & FUELS
·
2020
·
IF 3.421
Fangfang Li,Shaojuan Zeng,Yinge Bai,Haifeng Dong,Hui Wang,Xiaoyan Ji,Xiangping Zhang
Developing carbon dioxide (CO2) capture technologies has caused worldwide interest because of the baneful influence of CO2 on climate change as a main greenhouse gas. Ionic liquids (ILs) are considered as potential absorbents for CO2 capture because of their unique properties compared with current amine-based solvents. In this work, new dianionic-functionalized IL-based solvents, bi(1,8-diazabicyclo[5.4.0]undec-7-ene) dimethylhydantoin/ethylene glycol ([(DBUH)2][Dhyd]/EG), were designed and prepared for efficient and reversible chemisorption of CO2. Among the absorbents, [(DBUH)2][Dhyd]/EG with a mass ratio of 5:5 exhibited not only a high CO2 absorption capacity of 0.11 g CO2/g absorbent at 20 °C and 0.10 MPa but also good recyclability. Spectroscopic characterizations and simulation calculations confirmed that the superior CO2 capacity may be attributed to the simultaneous reaction of CO2 with both the [Dhyd]2– anion and deprotonated EG. The excellent CO2 absorption and regeneration performance imply that [(DBUH)2][Dhyd]/EG solvents may have great industrial application potentials.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Zhiming Wu,Chongyang Liu,Hongye Cheng,Lifang Chen,Zhiwen Qi
A process concept for separation of hydrophobic compounds tuned by aqueous ionic liquid was developed and demonstrated by two typical cases, namely extractive desulfurization of fuel and separation of detergent range alcohol-alkane mixture. The ionic liquid tetrabutylphosphonium bromide (TBPB) and water, which present opposite interactions with hydrophobic solutes, were used to tune the separation process by adjusting their ratio. A small amount of water was favorable for extraction, while a large amount of water was beneficial for regeneration. For each separation case, the 1:2 M ratio of TBPB and water gave an effective extraction performance; further introducing water decreased hydrophobic solute solubility and promoted regeneration. The regenerated aqueous TBPB had an extraction efficiency close to that of fresh one. This tunable separation process relying on water is therefore environmentally friendly and can be extended for other hydrophobic compounds separation.
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Chemical Engineering and Processing-Process Intensification
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2020
·
IF 3.731
Jingwei Yan,Yu Zhao,Keying Li,Huimin Zhang,Liwei Fan,Zexiang Lu
A novel approach was developed for producing biodiesel by acid ionic liquid catalyzed esterification of oleic acid and methanol under ultrasonic-microwave combined intensification. Four kinds of acid ionic liquids were synthesized as suitable catalysts. Some key parameters affecting oleic acid conversion were investigated using single factor experiments. Moreover, the production process was optimized via response surface methodology. The results indicated that the ionic liquid 1-(4-sulfobutyl)-3-methylmidazolium hydrosulfate exhibits good catalytic performance because of its double acid sites. The ultrasonic-microwave combined assistance can intensify the process to significantly shorten the reaction time from about 180 min to 15 min, thereby affording good industrial application potential. The specified regression model is accurate, reliable, and adequate for simulating actual production; the oleic acid conversion was 97.85 %, which is close to that achieved with conventional methods.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 32
·11119-11127
·
IF 7.059
Zijian Gao,Lingshu Kong,Rining Jin,Xin Liu,Wei Hu,Guanghui Gao
With the prosperity of flexible energy storage and wearable strain sensing, the ion conductive hydrogel attracts booming attention as electrolyte materials of flexible supercapacitors and flexible strain sensors due to the distinguishing soft and wet feature. Herein, a self-healing hydrogel with mechanical, adhesive and conductive properties has been designed and prepared by introducing polydopamine nanoparticles and water-soluble ionic liquids into hydrophobic association polyacrylamide. The resultant hydrogel samples could be employed as an electrolyte and wearable strain sensor, simultaneously. As hydrogel electrolytes, the resultant supercapacitor possesses a capacitance of 0.37 F g−1 and capacitance retention of 75.42% after 8000 cyclic charge–discharge tests. Furthermore, the supercapacitor exhibits a capacitance of 0.365 F g−1 after self-healing, which is 98.65% compared to the original data. As flexible strain sensors, the hydrogels could detect tiny and large-scale human movements in accordance with resistive signals and a gauge factor of 0.841. It could be anticipated that the self-healing hydrogels could be prospective flexible materials for a new generation of flexible sensors and supercapacitors over a wide temperature range.
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ENERGY & FUELS
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2021
·
IF 3.605
Congsu Niu,Lianyuan Ji,Yao Chen,Shuai Ma,Yiwei Zhang,Xiaomin Liu,Hui Yang
Sodium–metal chloride batteries are usually operated at a relatively high temperature (270–350 °C) to achieve adequate electrochemical performance. Such a high operating temperature may cause several issues and limit their widespread applications. Lowering the operating temperature may alleviate these issues, which can be achieved by reducing the ohmic resistance of a Na−β″-Al2O3 solid electrolyte (BASE) and incorporating a low-melting-point catholyte. Herein, a planar sodium–copper chloride battery is evaluated at intermediate temperatures (from 100 to 175 °C) with a thin BASE disk (500 μm) and a room-temperature ionic liquid (RTIL). The RTILs at various concentrations (0.1–0.75 mol L–1) are prepared by dissolving different amounts of sodium bis(trifluoromethanesulfon)imide (NaTFSI) into 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][TFSI]) and used as the catholyte. The effect of NaTFSI addition in [EMIm][TFSI] on the physical properties of the catholyte is examined. With 0.5 mol L–1 NaTFSI in [EMIm][TFSI] ionic liquid to assemble the Na/CuCl2 battery, the fabricated cell delivers a capacity up to 146.5 mAh g–1 when cycled at 175 °C with the current density of 2 mA cm–2 and retains 94.5% capacity after 20 cycles. Moreover, the battery can run steadily at 130 °C and show a reversible capacity of 79.2 mAh g–1 when the operation temperature is set as low as 100 °C. To the best of our knowledge, these are the lowest operation temperatures reported thus far for sodium–metal-chloride-based cells.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Ruiying Wang,Lili Yang,Xingchao Wang,Zhipeng Sun,Yong Guo,Mengran Lou,Hongli Shi,Pengtao Wen,Xiaoqin Hu
As an environmentally friendly energy technology, direct methanol fuel cells (DMFCs) meet the needs of sustainable development. Herein, novel dicyanamide anion-based (N(CN)2–) ionic liquid (IL)-functionalized reduced graphene oxide (rGO)-supported Pt catalysts are synthesized via a facile one-pot room temperature reduction method, which show a boost in methanol oxidation performance compared with Pt/rGO. The mass activities of the as-prepared Pt/emimN(CN)2/rGO (863.6 mA mg–1Pt) and Pt/epyN(CN)2/rGO (524.9 mA mg–1Pt) are about five and three times higher than that of Pt/rGO (178.6 mA mg–1Pt), and about six and four times higher than that of Pt/C (140.2 mA mg–1Pt), respectively. The participation of ILs significantly improves the CO poisoning resistance, stability, and activity for methanol oxidation of catalysts. The relationship between the structures and conductivities of diverse ILs and the performance of Pt catalysts are studied systematically. These findings may offer a promising prospect of ILs in DMFCs.
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EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Tianlin Wang,Yue Zheng,Guangren Yu,Xiaochun Chen
The catalytic effect of nanoparticles was significantly affected by its size and surface property. In this work, a series of ionic liquids were synthesized and used as surfactant to modify CoFe 2 O 4 MNP. XRD, FT-IR, TEM and VSM were performed to characterize modified CoFe 2 O 4 . The modified CoFe 2 O 4 MNP with average size of 7 nm was obtained and it was so well dispersed in ethylene glycol that ethylene glycol based magnetic fluid was obtained. Modified CoFe 2 O 4 MNP was used as catalyst for glycolysis of PET and showed excellent catalytic effect. The influence of ionic liquids surfactant and experimental factors on glycolysis were investigated. Under optimal condition, PET (5 g), catalyst (CoFe2O4/C10-OAC, 0.1 g) and EG (25 g) at 195 °C for 2.5 h, the PET conversion was 100% and BHET yield was 95.4%. More importantly, this catalyst can be collected by external magnetic field and its catalytic effect did not obviously decrease after it was reused for ten times. This work provided a new type of highly efficient catalyst of glycolysis of PET.
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JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 34
·19283-19295
·
IF 4.22
Qi Shoujing,Zhang Chunyu,Hu Zhengjie,Chen Xuwei
Ionic liquids are becoming widely applied in the extraction/separation of biological molecules. In this study, the solidification of ionic liquid 1-hydroxyethyl-3-vinylimidazole chloride ([HVIM]Cl) was achieved via one-pot free radical copolymerisation with divinylbenzene (DVB) as a cross-linking reagent, giving a mesoporous hydrophilic polymeric ionic liquid (PIL). Mesoporous PIL possesses a large surface area of 328.32 m 2 ·g −1 and a high pore volume of 0.45 cm 3 ·g −1 . Owing to hydrophilic interactions and π–π stacking interactions, the PIL adsorbs ovalbumin (Ova) selectively with a theoretical maximum adsorption capacity of 2468.0 mg·g −1 , and this Ova adsorption fit the Langmuir model well. The captured Ova was efficiently recovered using sodium dodecyl sulphate (0.4%, m·v −1 ) with an elution efficiency of 94.7%. Circular dichroism spectra indicated that the adsorption-elution process caused no conformational changes in Ova, indicating that the prepared PIL is highly biocompatible. The practicability of this mesoporous PIL was well demonstrated by the selective adsorption of Ova from protein mixtures and the efficient isolation of Ova from chicken egg white. Graphical abstract
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RADIATION PHYSICS AND CHEMISTRY
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2019
·
IF 1.984
Wei Qi,Mengjie Li,Long Zhao
Recently, controlled synthesis of nanoparticles through the use of microemulsions combined with electron-beam or γ irradiation has garnered interest. However, there are rare research about the effect of these radiations on the interfacial properties and phase behavior of microemulsions. Therefore, in this work, we prepared ionic liquid-based microemulsions (IL-C n -Ms) combining 3-methylimidazolium hexafluorophosphate having different alkyl chain lengths, TX-100, and deionized water and then irradiated them with a high-energy electron beam . The effects of radiation and alkyl chain length on microemulsion microregions, droplet size, surface tension, and solubilization were investigated in detail. Radiation had a negligible effect on the interfacial properties and phase behavior of the IL-C n -Ms. Interestingly, the droplet size of IL-C n -Ms increased with the alkyl chain length of the ionic liquid due to the IL interactions at the IL-C n -Ms interface. Our work provides a preliminary database and presents new opportunities for the combination of ionic liquid-based microemulsions and radiation technology.
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