Materials Research Express
·
2020
·Vol. 7
·期 1
·016437
·
IF 1.929
Linchen Liao,Caifeng Chen,Jilong Qian,Youming Zhang,Ruifang Zhang,Jiaguang Zhu
PVDF/IL piezoelectric film based on [Emim]BF4-added was prepared by near electric field direct writing. The β-phase content and its electric property of the film were analyzed. The results showed that the content of β crystal phase of PVDF film was improved by the synergistic effect of IL ([Emim]BF4) and near electric field. When the amount of [Emim]BF4 added was 1.5 wt%, the relative β-phase content of PVDF film reached 85.09%, and the crystallinity is 47.84%. Increase in [Emim]BF4 content resulted in a significant increase in the relative dielectric constant of the film, from 6 to 285, but also accompanied by a sharp increase in dielectric loss. The d33 value of the film can be as high as −10 pC/N, and the output voltage from the cantilever beam vibration feedback indicates that the voltage strength of the [Emim]BF4-added film is greatly improved compared with the pure PVDF film.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yongmei Xuan,Kaile Fang,Bosheng Duan,Neng Gao,Guangming Chen
Ionic liquids (ILs), 1-ethyl-3-methylimidazolium iodine [Emim]I and 1,3-dimethylimidazolium iodine [Dmim]I, were proposed as a novel potential solvent in traditional bromide aqueous solution (H2O + LiBr) in absorption refrigeration cycles. The vapor pressure data of two ternary systems H2O + LiBr + [Emim]I (mass ratio LiBr/[Emim]I = 4) at temperatures from 350.78 to 414.19 K and H2O + LiBr + [Dmim]I (mass ratio LiBr/[Dmim]I = 2) at temperatures from 350.69 to 409.63 K were reported by the boiling point method. The absorbent mass fractions are from 0.30 to 0.57 and 0.30 to 0.60, respectively. The measured data were correlated by using the Antoine-type equation, and the average absolute relative deviation (AARD %) between measured data and regression data was 0.54 and 0.39%. Compared with the vapor pressures of IL mixtures with the same organic cation, the vapor pressure order is LiBr + [Emim]I + H2O < LiBr + [Emim]Cl + H2O < LiBr + [Emim]Ac + H2O and LiBr + [Dmim]I + H2O < LiBr + [Dmim]Cl + H2O < LiBr + [Dmim]BF4 + H2O. Under experimental conditions, the hydrophilic properties of the iodine anion (I–) are better than those of the chlorine anion (Cl–), acetate anion (Ac–), and tetrafluoroborate anion (BF4–). Lower vapor pressure means stronger moisture absorption property. The proposed ternary mixtures have lower vapor pressures and can improve the absorption effect of the absorption system.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yongmei Xuan,Bosheng Duan,Kaile Fang,Yaqi Ding,Neng Gao,Guangming Chen
The vapor pressure properties of ionic liquids (ILs) 1-ethyl-3-methylmidazolium iodide ([Emim]I) and 1,3-dimethylimidazolium iodide ([Dmim]I) as absorbent species in lithium chloride aqueous solution (LiCl/H2O) are experimentally investigated. The vapor pressure data of ternary IL mixtures, LiCl + [Emim]I + H2O (mass ratio LiCl/[Emim]I = 3) from a temperature of 338.26–419.83 K at three mass fractions of the absorbent (0.3, 0.4, and 0.5) and LiCl + [Dmim]I + H2O (mass ratio LiCl/[Dmim]I = 3) from a temperature of 354.54–427.23 K at four mass fractions of the absorbent (0.3, 0.4, 0.5, and 0.54), were measured and reported using the boiling point method. The Antoine-type equation was used to fit the experimental data. The average absolute relative deviation (AARD%) values of the experimental data and the calculation results were 0.416 and 0.515%, respectively. By comparing the measured vapor pressure data with a binary mixture (LiCl + H2O), the ternary system of lithium bromide aqueous solution and the same IL (LiBr + ILs + H2O), and ternary mixtures of lithium chloride and ILs of the same organic cation (LiCl + ILs + H2O), it was found that, under experimental conditions, the order of vapor pressures of the proposed ternary systems is LiCl + [Dmim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + H2O, LiCl + [Emim]I + H2O < LiBr + [Emim]I + H2O, LiCl + [Dmim]I + H2O < LiBr + [Dmim]I + H2O, LiCl + [Emim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + [Emim]Br + H2O, and LiCl + [Dmim]I + H2O < LiCl + [Dmim]DMP + H2O < LiCl + [Dmim]Cl + H2O < LiCl + [Dmim]BF4 + H2O.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2022
·
IF 8.321
Fei Chen,Wensheng Wei,Yunsheng Gao,Yuxin Wang,Zizhen Yan,Zhanguo Zhang,Haiming Yu,Guangwen Xu,Lei Shi
Ionic liquid 1-ethyl-3-methylimidazolium ([Emim]IM) with high thermal stability and strong basicity was successfully synthesized. Using [Emim]IM as catalyst, dimethyl carbonate (DMC) was directly synthesized from epoxy propane (PO), CO 2 , and methanol under mild reaction conditions. A continuous two-stage DMC synthesis process was developed. The cycloaddition of CO 2 and PO was first conducted to produce propylene carbonate (PC), and then methanol was introduced into the system to synthesize DMC. During the cycloaddition process, 97.40% PO conversion and 97.40% PC yield were achieved with TON of 99.49. In the subsequent transesterification stage, DMC yield attained 83.63% with selectivity higher than 99% and TON of 70.15. [Emim]IM was reused for seven times without obvious deactivation, exhibiting good stability. The effects of reaction temperature, reaction time, the initial pressure of CO 2 , and catalyst weight on cycloaddition and transesterification reactions were systematically investigated. The kinetic study showed that the activation energies (E a ) of cycloaddition and transesterification reactions were 28.02 and 38.53 KJ·mol −1 , respectively, much lower than those of catalysts reported in the literatures. In addition, [Emim]IM displayed superior catalytic activity for the cycloaddition of CO 2 with various epoxy compounds .
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
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.
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
ACS Omega
·
2026
·
IF 5.2
Ruifeng Wang,Huangxin Cheng,Jiangnan Li,Gengzhe Shen,Yu Li,Jingmei Lyu,Zhengjian Chen
Gel polymer electrolytes typically suffer from low ionic conductivity, limited oxidative stability, and thermal runaway. Nitrate additives can be beneficial, but they are limited by poor solubility. Herein, sandwich-structured ionic liquid gel electrolyte membranes were fabricated by incorporating a polyethylene (PE) interlayer between two poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP) layers loaded with LiTFSI and 1-ethyl-3-methylimidazolium nitrate ([EMIm]NO2). The PFENE3 membrane prepared with 22.9 wt % [EMIm]NO2 shows optimal overall performance. Specifically, the PE scaffold provides robust mechanical strength (36.7 MPa). The incorporation of [EMIm]NO2 induces multiple synergistic effects: (i) increasing ionic conductivity to 5.03 × 10–4 S cm–1 at 25 °C by suppressing PVDF–HFP crystallinity; (ii) achieving a high Li+ ion transference number (0.449) by confining other charge carriers within the TFSI-[EMIm]+-NO2 hydrogen-bonding network; and (iii) the sacrificial decomposition of NO2 to form robust protective interphases on both the anode and cathode. Consequently, Li/PFENE3/Li symmetric cells demonstrated stable cycling for over 600 h at 0.3 mA cm–2. Furthermore, the Li/PFENE3/NCM622 full cell delivered an initial capacity of 170.9 mAh g–1 at 0.1 C and 159.3 mAh g–1 at 0.5 C, with 78% retention after 100 cycles, significantly outperforming [EMIm]NO2-free systems. These findings provide a viable strategy for developing high-performance and safe Li-metal batteries.
✓ 已验证
产品关联
DOI
高影响因子
Thermal Science and Engineering Progress
·
2025
·
IF 5.4
Yanlong Lv,Yuhao Wang,Yutong Gong,Feng Liu,Yunze Hao,Jiyuan Zhou,Jun Sui
To explore the application performance of 1-Ethyl-3-methylimidazolium based ionic liquids in absorption heat transformers, this study measured the saturated vapor pressure of 1-Ethyl-3-methylimidazolium chloride and 1-Ethyl-3-methylimidazolium methanesulfonate solutions at different concentrations and the specific heat capacity of their pure substances at 25–200 °C. Using the Non-Random Two-Liquid activity coefficient model and enthalpy calculation equations, the measured data were correlated with an absorption heat transformer model. A sensitivity analysis was conducted focusing on condensation temperature, evaporation/generation temperature, and absorption temperature, with a comparison to the traditional LiBr + H 2 O working pair. Results indicated that the LiBr + H 2 O working pair performs well under conventional temperature conditions. However, the ionic liquid working pairs demonstrate a broader viable temperature range, showing stable performance when the condensation temperature is below 81 °C, the evaporation/generation temperature exceeds 108 °C, and the absorption temperature is below 197 °C. Furthermore, comparing the optimal coefficient of performance and exergy performance coefficient data with their corresponding absorption temperatures revealed that 1-Ethyl-3-methylimidazolium methanesulfonate + H 2 O working pair exhibits the best performance when the absorption temperature exceeds 195 °C, with the ability to maintain coefficient of performance and exergy coefficient of performance values of 0.21 and 0.37, respectively, even at an absorption temperature of 240 °C. This study accurately measured the thermophysical properties of the 1-Ethyl-3-methylimidazolium based ionic liquid + H 2 O working pairs under high-temperature conditions, providing crucial insights into their application in absorption heat transformers. It outlines their benefits and limitations compared to traditional working pairs, thus paving the way for future research.
研究领域:
热力学
·
化学工程
·
能源技术
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2016
·Vol. 4
·期 9
·1112-1118
·
IF 2.557
Handong Jiao,Junxiang Wang,Jiguo Tu,Haiping Lei,Shuqiang Jiao
An aluminum-ion asymmetric supercapacitor was assembled utilizing a cathode made of multi-walled carbon nanotubes (MWCNTs) in an ionic liquid 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)-based electrolyte. Two types of energy-storage mechanisms, that is, electrochemical double-layer capacitance (adsorption/desorption of AlCl 4 − on the surface) and limited intercalation pseudocapacitance (intercalation/deintercalation of AlCl 4 − in the graphite layer) at low current density, were observed and characterized. Meanwhile, the specific capacitance and cyclic stability of this supercapacitor were also evaluated by using galvanostatically charging–discharging. The result demonstrates that the specific capacitance decreases with increasing current density, which corresponds to the two types of energy-storage mechanisms of this device. The corresponding retention rate of this device after 3500 cycles at current density of 0.4 A g −1 was 82.4 %, which shows good cyclic stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Bo Wang,Shuangjiang Li,Xiandong Hao,Wenbo Zhao,Zhiyong Xu,Yongming Luo
Traditional amine scrubbing for SO 2 capture typically dilutes alcohol amines with water to improve mass transfer, resulting in high volatility and desorption energy consumption. Inspired by the exceptional properties of ionic liquid (IL) 1-ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]), we herein propose substituting water with [EMIM][SCN] in a novel SO 2 absorbent system based on N -methyl ethanolamine (MDEA). MDEA acts as the primary SO 2 absorbent, while [EMIM][SCN] serves as an auxiliary absorption component and physical properties regulator. Performance evaluations reveal that MDEA-[EMIM][SCN] achieves high thermal stability (~483.15 K), low viscosity (~26 mPa s), excellent absorption capacity (~1.64 mol/kg at 298.15 K and 2000 ppm SO 2 ), high SO 2 /CO 2 selectivity (~101), and low desorption energy (approximately −95.6 kJ/mol). Thermodynamic modeling illustrates MDEA and [EMIM][SCN] contribute independently to absorption. Optimal energy consumption was determined by the proposed objective function. This work exemplifies the non-aqueous alkanolamine/IL system for SO 2 capture, offering a promising approach for developing efficient, low-energy SO 2 absorbents.
研究领域:
化学工程
·
环境科学
·
热力学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Hui-Sheng Peng
To reveal the relationship between anion structure and thermal decomposition property, an experimental system integrating comprehensive thermal analysis and Fourier-transform infrared spectroscopy is constructed to investigate the thermal decomposition mechanisms of four 1-ethyl-3-methyl imidazolium-based ([EMIM] + ) ionic liquids with anion structures of thiocyanate ([SCN] - ), dicyanamide ([DCA] - ), tetrafluoroborate ([BF 4 ] - ), and bis(trifluoromethylsulfonyl)imine ([NTF 2 ] - ). Results show that the thermal stability follows the order of [EMIM][NTF 2 ] > [EMIM][BF 4 ] > [EMIM][DCA] > [EMIM][SCN] by decomposition temperature. Spectrum analyses reveal that the anion structures are thoroughly disrupted, forming different gas products, while the cation structure only undergoes substitution and elimination reactions on the imidazole ring. Due to the differences in anion structure, methyl isothiocyanate, trifluoromethanesulfonamide and sulfur dioxide, ammonia, and boron trifluoride are found as key products during the decomposition of [EMIM][SCN], [EMIM][NTF 2 ], [EMIM][DCA], and [EMIM][BF 4 ], respectively. Following designs of anion structure for propellant may start from [SCN] - and [DCA] - to obtain better decomposition property.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Wei Chen,Zheng Xing,Ying Wei,Xinyuan Zhang,Qingguo Zhang
Gel-polymer electrolytes (GPEs) are of great interest to build high-performing rechargeable electrical double-layer capacitors (EDLCs) owing to the combination of good electrochemical properties and improved safety. Herein, we report a quasi-solid-state GPE for EDLCs from a mixture of the poly (vinylidene fluoride- co -hexafluoro propylene) (PVDF-HFP) and ionic liquid 1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM][BF 4 ]), which avoids the leakage of liquid electrolyte and the low conductivity of common solid electrolyte . The intermolecular forces of GPE was characterized by in-situ infrared (IR) spectroscopy, and the interactions between ionic liquid and polymer were also analyzed. The prepared GPE was observed to be easily procurable, excellent transparency, high thermal safety (thermal stability up to 320 °C) and outstanding electrochemical properties at room temperature (wide electrochemical stability window of 3.91 V versus SS (SS being stainless steel foils) and high ionic conductivity of 6.9 × 10 −3 S cm −1 ). The specific capacitance, the maximum specific energy, and the maximum specific power of the fabricated symmetrical supercapacitor had been determined to be 161.8 F g −1 , 89.89 Wh kg −1 , and 8 kW kg −1 , respectively. Moreover, the EDLC shows extraordinary electrochemical behaviors and cyclic stability over up to 10 000 cycles at 25 °C with 86% capacitance retention under a current load of 2 A g −1 . The experimental results indicate the excellent potential of the [EMIM][BF 4 ] ionic-liquid-based gel polymer electrolyte for EDLCs.
研究领域:
电化学
·
储能
·
材料科学
·
高分子科学
·
超级电容器
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2026
·
IF 1.3
Xu Saiyuan,Guo Yujun,Wu Yibin,Chen Bin,Xu Yingjie
This study aims to develop and characterize a novel mixed system composed of sodium phenoxide (NaOPh) and a deep eutectic solvent (DES) formed from 1-ethyl-3-methylimidazole chloride ([Emim]Cl) and ethylene glycol (EG), in order to address the phase separation issue commonly encountered in aqueous phenoxide solutions during CO₂ absorption—caused by the generation of phenol. The physicochemical properties, CO 2 absorption performance and absorption mechanism of the NaOPh/DES mixed system were investigated. The results indicate that the density, viscosity, and CO 2 absorption capacity of the studied NaOPh/DES mixed systems increase with NaOPh content. The NaOPh1.0/DES system exhibits the best absorption performance of these systems, with a CO 2 absorption capacity of 2.10 mol‧kg −1 at 313.15 K and 0.1 MPa. DFT calculations reveal that the Na + from NaOPh, the O–H group from EG, and the Cl − from [Emim] Cl can form a stable four-membered ring. This weakens the electrostatic interaction between Na + and [PhO] − , promoting the dissociation of the NaOPh and facilitating the chemical reaction between the “free” [PhO]⁻ and CO 2 to form carbonates. This mechanism is confirmed by FT-IR and 13 C NMR spectra. Using [Emim]Cl–EG DES as a solvent to dissolve NaOPh leverages the reactivity of [PhO] − with CO 2 for efficient absorption, while effectively avoiding phase separation. This expands the application of phenoxide-based systems in CO₂ capture.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）