FUEL
·
2017
·
IF 4.601
Yichun Dong,Chengna Dai,Zhigang Lei
Methylal is used as an important synthetic fuel blended with diesel oil to reduce the particulate emissions of toxic gas pollutants without affecting the energy density. The mixed entrainers (dimethylformamide (DMF) + ionic liquid (IL)) are proposed to replace conventional DMF for the separation of methylal and methanol by extractive distillation. [EMIM] + [Ac] − might be the most promising entrainer screened by COSMO-RS model considering relative volatility and solvent capacity together. Vapor–liquid equilibrium (VLE) experiments demonstrated that the relative volatility of methylal to methanol is obviously improved after the addition of [EMIM] + [Ac] − into DMF. Moreover, the UNIFAC-Lei model was extended to the methylal-methanol-DMF-IL system, and the corresponding interaction parameters were obtained and input into the equilibrium (EQ) stage model established in this work. Based on the thermodynamic study, process simulation was developed. It was found that the overall heat duty of reboilers decreased 9.25% using the proposed mixed entrainers when compared to pure DMF. In addition, the COSMO-RS model and DFT calculation provide some theoretical insights into the separation mechanism.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yuenan Chen,Ziming Li,Nanjun Chen,Rui Li,Yajun Zhang,Ke Li,Fanghui Wang,Hong Zhu
In this paper, we prepared a series of ionic liquids including methyl ionic liquids, ethyl ionic liquids and hydroxyethyl ionic liquids. We used the common polymer backbone polyphenylene ether and the conventional conductive group triethylamine . We introduced three different ionic liquids to investigate different effects of the extent of ion conductivity improvement from its structure change. The introduction of ionic liquid significantly improved the ionic conductivity of the alkaline membrane. The highest conductivity of the composite membranes was 2.5 times higher than that of the pure membrane. A certain amount of nano-TiO 2 was added into the membranes through ultrasound dispersion to form a series of trimethylamine-nano-TiO 2 -ionic liquid composite membranes. We found that TiO 2 -ethyl ionic liquid composite membrane has optimal performance, whose ionic conductivity up to 59.27 mS/cm. and the degradation rate of ionic conductivity is 27.4% under strong alkali conditions. The water uptake and swelling ratio of the composite membrane are relatively low, and the thermal stability and mechanical properties also meet the requirements of the application.
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Polymers
·
2024
·Vol. 16
·期 12
·1680
·
IF 4.7
Hui Li,Changmiao Huang,Zixuan Teng,Yushu Luo,Chaocan Zhang,Lili Wu,Wenchao Huang,Tingting Zhao,Lijie Dong,Wanyu Chen
Zinc-ion batteries are promising candidates for large-scale energy storage. The side reactions of the hydrogen evolution reaction (HER) and zinc dendrite growth are major challenges for developing high-performance zinc-ion batteries. In this paper, a supramolecular gel electrolyte (BLO-ILZE) was self-assembled in an ionic liquid (EMIMBF4) with zinc tetrafluoroborate (Zn(BF4)2) on the separator in situ to obtain a gel electrolyte used in zinc-ion batteries. BLO-ILZE is demonstrated to significantly enhance conductivity over a broad temperature range between −70 and 100 °C. Interestingly, through testing and fitting, it is found that the supramolecular gel electrolyte satisfies the liquid state law over a wide temperature range, and even achieves high conductivity (2.12 mS cm−1) at −40 °C. It is equivalent to the conductivity of aqueous zinc-ion batteries (ZnSO4/H2O) at −10 °C, which is 2.33 mS cm−1. Moreover, the supramolecular gel electrolyte can effectively inhibit the HER, thus exhibiting a longer lifetime in Zn/Zn cells for 3470 h at 1 mA cm−2compared to the aqueous zinc-ion batteries with the Zn(BF4)2aqueous electrolyte (400 h at 1 mA cm−2). The assembled V2O5/BLO-ILZE/Zn full cells also showed cycling performance, with 5000 cycles at 0.5 mA g−1at room temperature, a capacity of 98%, and a coulombic efficiency of about 100%.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Han Sun,Shuang Wang,Xiaorui Wang,Feng Pan,Chenglong Li,Di Yu,Yu Luo,Zhe Wang
For further enhance the proton conductivity and long-term performance of the BOPBI (branching ratio of 6%) with rigid triazine structure with large free volume, a large volume of positive polymeric ionic liquid that can be crosslinked is introduce into the system, and then KH-560 crosslinker with 3% quality fraction is introduced into the system. When the CBOPBI-PIL-X membranes are soaked in KOH solution, The proton conductivity of CBOPBI-PIL-X membranes (X = 0%–40%) was great enhanced due to the formation of ion-pairs (X + - H 2 PO 4 − ), which can be used as both a proton donor and receptor, providing a binding site for proton transmission. Since the high free volume provided by the branched structure can help the membrane absorb more phosphoric acid, and the unique mechanism of action of PIL can provide new proton transport channels, among these membranes, the ultimate tensile strength (4.68 MPa) of PA-doped CBOPBI-PIL-30% film was great and the membrane can also gain excellent proton conductivity (155.8 mS cm −1 at 180 °C). Due to the addition of KH-560, the Si-O-Si crosslinking network can resist the oxidative free radical attack effectively, which substantially improves the oxidation stability of membranes. After 144 h of testing, all CBOPBI-PIL-X membranes are not broken. And after 240 h of acid retention testing at 160 °C/0% RH condition, the best PA retention ratio of CBOPBI-PIL-X membranes can still reach 83.7%, which can prove that the membranes have excellent performance. Therefore, CBOPBI-PIL-X membranes are expected to be used in high-temperature proton exchange membranes (HT-PEMs).
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POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Yi Zhou,Zhiliang Huang,Bangjun Deng,Chunli Gong,Hai Liu
Anion exchange membranes (AEMs) are the core components of fuel cells, playing a dual role in blocking anode/cathode and conducting OH − ions. In order to address the trade-off between ion conductivity and mechanical property of AEMs, imidazole ionic liquid-grafted cellulose nanocrystals (IL@CNC) was prepared and used as a novel one-dimentional nanofiller to modify quaternized chitosan (QCS) and polyvinyl alcohol (PVA) blend polymer matrix to obtain IL@CNC/QCS-PVA composite membranes. The uniform dispersion of IL@CNC and the strong interaction between nanofillers and polymer matrix significantly increased the tensile strength and toughness. Moreover, with the help of 1D shape of CNC together with the grafted imidazole groups, highly-effective ion transport channels were formed inside the membrane, and ion exchange capacity was also increased, thereby sharply improving the ionic conductivity of the composite membranes. The membrane containing 4% IL@CNC demonstrated the ionic conductivities of as high as 29.3 and 76.5 mS cm −1 at room temperature and 80°C, respectively, which were 4.0 times and 3.6 times higher than those of the pure membrane under the same condition. The as-prepared composite membranes containing the biopolymer and functionalized natural nanocellulose are expected to be used as a novel type of biomass-based AEMs. Highlights Imidazole IL grafted CNC was used as a novel 1D nanofiller to modify QCS-PVA. The membrane had high ionic conductivity and mechanical properties. Providing a new way to design biomass-based AEMs with high performance.
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BIORESOURCE TECHNOLOGY
·
2012
·
IF 4.98
Yongshui Qu,Chongpin Huang,Yanlei Song,Jie Zhang,Biaohua Chen
The dehydration of fructose or glucose to 5-hydroxymethylfurfural (5-HMF) using room temperature ionic liquids (ILs) as a solvent is a promising method for producing liquid fuels from renewable resources . The IL, 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate ([C 2 OHMIM]BF 4 ), was used a catalyst—rather than as a solvent—in the conversion of fructose or glucose to 5-HMF. With glucose, the yield of 5-HMF reached as high as 67.3% after 1 h at 180 °C in dimethylsulfoxide (DMSO) as solvent. The catalyst was separated from the reaction mixture by distilling solvent and reused six times without loss of activity. Furthermore, a kinetic analysis was carried out to illustrate the formation of 5-HMF, and the values of the activation energy and the pre-exponential factor for the reaction were 55.77 kJ mol –1 and 1.6 × 10 4 min –1 respectively.
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Battery Energy
·
2025
·
IF 9.9
Yibing Yang,Min Liu,Dongliang Zhang,Shuilin Wu,Wenjun Zhang
Aqueous electrolytes, with their inherent safety, low cost, and eco-friendliness, provide a promising alternative for energy storage devices, but their application is limited due to the narrow electrochemical stability window of water. Using super-concentrated electrolytes has been demonstrated effectives in expanding the electrochemical window of aqueous electrolytes. However, this approach also brings in several challenges, including decreased ionic conductivity, poor wettability, and increased temperature sensitivity due to the near-saturated salt concentrations. In this study, we employed a water-miscible ionic liquid (i.e., 1-butyl-3-methylimidazolium trifluoromethanesulfonate) to break the solubility limitations faced in super-concentrated electrolytes and created a new “water in ionic liquid” electrolyte that simultaneously featured with broad electrochemical window, decent ionic conductivity, and wide temperature compatibility. Moreover, a prototype of electrochemical double-layer supercapacitor utilizing the “water in ionic liquid” electrolyte demonstrates outstanding performance characteristics, including a high operating voltage (2.6 V), excellent rate capability with 81% capacitance retention from 0.5 to 30 A g –1 , remarkable cyclic stability with 75% capacitance retention after 120,000 cycles, along with broad temperature compatibility from –20°C to 60°C. These findings not only provide new insights into electrolyte engineering but also offer a pathway for designing innovative aqueous electrolytes for energy storage devices with balanced electrochemical performance.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 8
·3404-3410
·
IF 5.968
Xiao-lei Huang,Jia Chai,Tao Jiang,Ying-Jin Wei,Gang Chen,Wan-qiang Liu,Dongxue Han,Li Niu,Limin Wang,Xin-bo Zhang
Large-area Co(OH)2 nanosheets have been successfully coated with ionic liquid modified graphenevia a general strategy. The advantageous combination of graphene and the 2D structure of the Co(OH)2 nanosheets endows the obtained heterostructures with a remarkable lithium-storage performance, including high reversible capacity and superior cyclic and rate performance.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2012
·
IF 2.237
Xiaomeng Wang,Hui Wan,Mingjuan Han,Lei Gao,Guofeng Guan
A series of polymer-supported metal chlorides imidazolium ionic liquid (IL) moieties, M/CMPS-Im(Cl) (M = CuCl, ZnCl2 and FeCl3), were synthesized by grafted method using chloromethylated polystyrene (CMPS) resin as support. Meanwhile, the structures of synthesized ILs were characterized by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). The results showed that the surface of CMPS resin was covered with a thin layer of extraction activity components. Then, the synthesized CMPS-supported imidazolium-based ILs were investigated to extract thiophene and its derivatives from model gasoline (n-octane/thiophene) under certain conditions. For a given imidazolium-based IL: first, the order of extraction capacity of extractant was CuCl/CMPS-Im(Cl) > ZnCl2/CMPS-Im(Cl) > FeCl3/CMPS-Im(Cl); the reason for this was that the π-complexation capability between Cu+ and thiophene was stronger than those of Fe3+ and Zn2+. Second, the sulfur removal selectivity of sulfur compound followed the order of TS < BT < DBT under the same conditions; it indicated that the extraction was favored for those aromatic heterocyclic sulfur compounds with higher density aromatic π-electrons density. Meanwhile, the effect of mass ratio of model gasoline to M/CMPS-Im(Cl) ILs, different initial sulfur concentrations, and extraction time on desulfurization rates of M/CMPS-Im (Cl) ILs was performed, respectively. Finally, regeneration of M/CMPS-Im(Cl) ILs was investigated.
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Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Tianrong Zhan,Yang Song,Xianjun Li,Wanguo Hou
The plate-like Zn-Al layered double hydroxide modified with 1-aminopropyl-3-methylimidzaolium tetrafluoroborate (named as ILs-LDH) was synthesized by coprecipitation method. Several techniques confirmed the layered structure of ILs-LDH with a disk-like morphology. A novel electrochemical sensor based on ILs-LDH modified glass carbon electrode (GCE) was developed for bisphenol A (BPA) determination. Experimental factors including modified content, pH, scan rate, accumulation time and potential had been carefully optimized. ILs-LDH/GCE performed the excellent electro-oxidation ability toward BPA with the more negative oxidation overpotential and larger peak current than bare GCE or LDH/GCE. Differential pulse voltammetry determination of BPA afforded a wider linear range from 0.02 to 3 μM with the detection limit of 4.6 nM (S/N = 3). The fabricated sensor demonstrated an acceptable reproducibility, good stability and high sensitivity. The proposed method was successfully used to detect BPA in real water samples with satisfactory recovery ranging from 94.9% to 102.0%.
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PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 15
·9079-9089
·
IF 3.108
Huan Wang,Yinmao Wei
Magnetic graphene oxide modified with 1-amine-3-methyl imidazole chloride ionic liquid (LI-MGO) was prepared through chemical co-precipitation and modified using 1-amine-3-imidazolium chloride ionic liquid. The as-prepared LI-MGO was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectrometry (FT-IR). The adsorption properties were evaluated through adsorption experiments with two kinds of anionic dyes, orange IV (OIV) and glenn black R (GR) and two kinds of cationic dyes, acridine orange (AO) and crystal violet (CV). The results indicated that the adsorption data fitted the Langmuir isotherm and followed pseudo-second-order kinetics. The maximum adsorption capacities for GR, OIV, AO and CV were 588.24, 57.37, 132.80 and 69.44 mg g−1 at 298 K, respectively. LI-MGO has better selective adsorption for anionic dyes than magnetic graphene oxide (MGO) due to electrostatic interactions. Moreover, the LI-MGO adsorbent can be magnetic separated and is easy to prepare. It demonstrated that LI-MGO would have great potential as an efficient environmentally friendly adsorbent for the removal of anionic dyes in water treatment.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xue Tian,Shuang Wang,Jinsheng Li,Fengxiang Liu,Xu Wang,Hao Chen,Hongzhe Ni,Zhe Wang
Polybenzimidazole (PBI)/ionic liquid (IL) functional Si–O–Si network composite membranes are prepared from PBI with 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride. The IL can be hydrolyzed to form Si–O–Si network structure under acidic conditions. And such IL functional Si–O–Si network (NP) in the composite membranes could improve phosphoric acid doping levels and proton conductivities simultaneously. The ability of retaining more PA is also reflected in the high proton conductivity value of PBI/NP-15% membrane which shows almost three-fold increment compared to the pristine PBI. All the PBI/NP-X composite membranes display excellent chemical stability and improved mechanical strength . This is attributed to Si–O–Si network structure. Moreover, PBI/NP composite membranes have demonstrated high thermal stability up to 250 °C, which is attractive for high-temperature (>200 °C) proton exchange membrane fuel cells.
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