ELECTROCHIMICA ACTA
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2013
·
IF 3.777
Junnian Chen,Tianyou Peng,Ke Fan,Renjie Li,Jiangbin Xia
An efficient plastic crystal-based electrolyte is prepared by employing succinonitrile as solid solvent and binary ionic liquids as charge transfer mediators for dye-sensitized solar cells (DSSCs). It was found that combining succinonitrile with ionic liquids could improve the mechanical property of electrolyte and avoid the fluidity of ionic liquid, and the fabricated solid-state solar cell shows an overall conversion efficiency of 2.14%, which can be further improved to 5.50% after optimizing the addition amount of lithium perchlorate (LiClO 4 ) as charge transfer promoter into the plastic crystal electrolyte, and the role of LiClO 4 in the plastic crystal ionic liquid electrolyte is evaluated through electrochemical and photoelectrochemical measurements. The knowledge obtained from this plastic crystal-based electrolyte exhibits new eyeshot to find solid-state electrolyte for DSSCs with high performance.
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高影响因子
CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Huifang Ren,Buana Girisuta,Yonggui Zhou,Li Liu
Cellulose depolymerization to levulinic acid (LA) was catalyzed by acidic ionic liquids (ILs) selectively and recyclably under hydrothermal conditions. The effects of reaction temperature, time, water amount and cellulose intake were investigated. Dilution effect becomes more pronounced at lower cellulose intake, dramatically improving the yield of LA to 86.1%. A kinetic model has been developed based on experimental data, whereby a good fit was obtained and kinetic parameters were derived. The relationships between IL structure, polymeric structure and depolymerization efficiency were established, shedding light on the in-depth catalytic mechanism of IL, inclusive of acidity and hydrogen bonding ability. The LA product can be readily separated through extraction by methyl isobutyl ketone (MIBK) and IL can be reused over five cycles without loss of activity. This environmentally friendly methodology can be applied to selective production of LA from versatile biomass feedstocks, including cellulose and derivatives, glucose, fructose and HMF.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
·
IF 2.587
Zhenghai Tang,Jing Huang,Xiaohui Wu,Baochun Guo,Liqun Zhang,Fang Liu
In silica-filled rubber composites, the silanization modification of silica plays a vital role in enhancing the compatibility between silica and a rubber matrix and hence the properties of the composites. In the present study, with the goal of promoting silanization reactivity and extent, we utilize a phosphonium ionic liquid (PIL) as a novel catalyst for the silanization reaction between silica and bis(3-triethoxysilylpropyl)-tetrasulfide (TESPT), a commonly used silane in the tire industry, in the styrene–butadiene rubber (SBR) matrix. Dynamic rheological measurement, bound rubber measurement, freezing point depression, and heat capacity increment together show that the addition of a small amount of PIL into a TESPT-modified SBR/silica composite gives rise to significant improvement in the interfacial adhesion between silica and the rubber matrix, which is on account of the promoted silanization extent of silica with the catalyst of PIL. Consequently, the resulting composite prepared at room temperature with fewer parts of TESPT exhibits superior overall performance in comparison with the composites prepared by adding excessive TESPT and compounding at an elevated temperature. In particular, the energy loss during rolling of the rubber wheel is drastically decreased as a result of the improved interfacial silanization, which shows great potential in energy-saving green tires.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Wenqi Song,Yuyang Liu,Liwei Qian,Luying Niu,Liqun Xiao,Yu Hou,Yan Wang,Xiaodong Fan
A hydrophobic hyperbranched polymeric ionic liquid ( hb -PIL) with an imidazolium (Im + )-salt backbone ( hb -PIm + PF 6 − ) was proposed for efficient adsorption of anionic dyes. For this purpose, a hydrophilic hb -PIL was first synthesized via the thiol–ene addition polymerization by the “ A 2 + B 3 ” method. Then, the anion exchange reaction of hb -PIm + Cl − with KPF 6 afforded the target hb -PIm + PF 6 − adsorbent. hb -PIm + PF 6 − has high adsorption capacity toward anionic dyes. In contrast, it exhibits less adsorption amount toward cationic dyes. By using congo red (CR) as the model adsorbate, the adsorption mechanism of hb -PIm + PF 6 − was investigated in detail by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray, and transmission electron microscopy analyses. The adsorption behavior of hb -PIm + PF 6 − towards CR was analyzed by two kinetic and four isotherm models. These results indicate the characteristic structure of hb -PIm + PF 6 − was responsible for its high adsorption capacity for CR. The main driving force for the CR adsorption was electrostatic attraction, carried out by the anion-exchange between CR and counter-ion PF 6 − of hb -PIm + PF 6 − . The presence of the cavities formed by the branched chains provided storage sites for CR binding. In addition, the selective adsorption of hb -PIm + PF 6 − towards anionic dye could be used to purify cationic solution containing anionic dye.
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高影响因子
Smart Materials and Structures
·
2015
·Vol. 24
·期 6
·065026
·
IF 2.502
Qingsong He,Min Yu,Xu Yang,Kwang Jin Kim,Zhendong Dai
A newly developed ionic electro-active actuator composed of an ionic electrolyte layer sandwiched between two graphene film layers was investigated. Scanning electronic microscopy observation and x-ray diffraction analysis showed that the graphene sheets in the film stacked in a nearly face-to-face fashion but did not restack back to graphite, and the resulting graphene film with low sheet resistance (10 Ω sq−1) adheres well to the electrolyte membrane. Contact angle measurement showed the surface energy (37.98 mJ m−2) of the ionic electrolyte polymer is 2.67 times higher than that (14.2 mJ m−2) of the Nafion membrane, contributing to the good adhesion between the graphene film electrode and the electrolyte membrane. An electric double-layer is formed at the interface between the graphene film electrode and the ionic electrolyte membrane under the input potential, resulting in a higher capacitance of 27.6 mF cm−2. We report that this ionic actuator exhibits adequate bending strain, ranging from 0.032 to 0.1% (305 to 945 μm) as functions of voltage.
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高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 48
·15242-15246
·
IF 0
Shengjiao Chen,Juan Li,Yingke Zhu,Zibin Guo,Shengpei Su
A highly efficient intumescent flame retardant (IFR) system for polypropylene is constructed by adding a polyoxometalate based ionic liquid (PIL) into conventional PP/IFR composites. The PP composite with 14.5 wt% IFR and 0.5 wt% PIL can pass the UL-94 V-0, while that for single IFR is more than 25 wt%.
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DOI
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Ming-Jie Chen,Qing-Shan Shi
The major challenges for directly converting lignocellulosic biomass into available materials in place of synthetic polymer materials are the complex chemical–physical structure and the narrow processing windows of the resources. In the present study, homogeneous chemical modification of sugarcane bagasse with phthalic anhydride was taken to be an improved strategy to meet the challenges. FT-IR and liquid-state NMR spectra confirmed the chemical structure of the sugarcane bagasse phthalates. Sugarcane bagasse phthalates with weight percentage gain higher than 32.9% were readily dissolved in organic solvents, and film materials were prepared by solution casting from the sugarcane bagasse phthalates. Thermogravimetric analysis and differential scanning calorimetry was applied to study the thermal behaviors of the sugarcane bagasse phthalates. Scanning electron microscope, atomic force microscopy and tensile testing were applied to study the morphologies and mechanical properties of the films. The results indicated that sugarcane bagasse was plasticized by homogeneous chemical modification with phthalic anhydride.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 44
·34622-34629
·
IF 3.84
Zhifeng Wu,Heyan Jiang
Pd and Ru nanoparticles were synthesized in ionic liquid by using tri(m-sulfonyl)triphenyl phosphine 1-butyl-2,3-dimethyl-imidazolium salt ([BMMIM]3[tppt]) as a stabilizing agent. The well-dispersed Pd and Ru NPs with mean diameters of 2.4 nm and 1.7 nm were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It was demonstrated that [BMMIM]3[tppt] stabilized Pd and Ru NPs displayed high activity and excellent selectivity in the hydrogenation of functionalized olefins, aromatic nitro compounds and aromatic aldehydes. The Pd and Ru NPs showed better catalytic performance than corresponding commercially available Pd/C and Ru/C catalysts. The present catalytic system could be easily reused at least six times without significant decrease in activity and selectivity.
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DOI
高影响因子
SYNTHETIC METALS
·
2013
·
IF 2.109
Zhaoling Ma,Jinqing Kan
Polyaniline doped with ZnCl 2 (PANI/Zn 2+ ) is prepared by chemical polymerization of aniline in a solution of 0.3 M aniline, 0.3 M zinc chloride, 1.0 M hydrochloric acid and 0.33 M ammonium persulfate at 5 °C. Polyaniline powder is mixed with acetylene black and sodium carboxymethyl cellulose (CMC) to be used as positive electrodes (cathodes) in batteries. Zinc powder is mixed with alloyed powder (65 wt.% Cu, 20 wt.% Sn, 15 wt.% Zn), acetylene black and CMC to obtain the negative electrodes (anodes). The battery electrolyte comprises 1.0 M ZnCl 2 and 2.0 M NH 4 Cl in the aqueous solution of 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES) (water/EMIES, 92:8 by volume). EMIES is added to the battery electrolyte to prevent the formation of Zn dendrites. The assembled cylindrical battery has an open-circuit voltage (OCV) of 1.32 V and the maximum specific capacity of the battery is 89.9 mAh g −1 at pH 4.0.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Jiayi Chen,Lingxiao Chen,Yueqing Lu,Yingjie Xu
Densities ( ρ ) and viscosities ( η ) of 1-methylimidazolium acetate ([Mim]Ac) protic ionic liquid + water mixture were measured at T = (293.15, 298.15, 303.15, 308.15 and 313.15) K under atmospheric pressure. Refractive indices ( n D ) and electrical conductivities ( κ ) of the above-mentioned system over the entire composition range were measured at 298.15 K. Excess molar volumes ( V E ), viscosity deviations (Δ η ) and refractive index deviations (Δ n D ) were obtained from the experimental data and fitted to the Redlich–Kister equation with satisfactory results. The results show that V E values of the system are negative over the whole composition range, whereas Δ η and Δ n D values are positive. Other volumetric properties such as apparent molar volumes ( V ϕi ), partial molar volumes ( V ¯ m , i ) and excess partial molar volumes ( V ¯ m , i E ) of the system were calculated from the density data. The concentration dependence of κ was fitted according to the empirical Casteel–Amis equation. The measured and derived properties were employed to investigate the intermolecular interactions of the system.
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高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 8
·3881-3889
·
IF 6.852
Chenhua Shu,Tonghua Sun,Qingbin Guo,Jinping Jia,Ziyang Lou
In order to improve the desulfurization efficiency, an ionic liquid (IL) was used as the solvent for the desulfurization of diesel fuel with nickel boride. The nickel boride prepared in IL–H2O showed high specific surface area. The desulfurization efficiency of model organosulfur compounds in this work was higher than that in the previous studies. The desulfurization reactivity of model organosulfur compounds followed the order of BT (DBT) > 3-MBT > 4,6-DMDBT. Furthermore, the products of model organosulfur compounds after desulfurization were analyzed by GC/MS and their corresponding reaction routes were proposed. The effectiveness of nickel salts followed the order of NiCl2 (Ni(OAc)2) > NiSO4 > Ni(NO3)2. The desulfurization efficiency of model diesel fuels reached 90.6% under the conditions of B/S molar ratio = 9, Ni(OAc)2/S molar ratio = 3, oil/IL volume ratio = 3, water content in IL = 5%, and reaction time = 50 min. ILs maintained their original structures after regeneration. Finally, the desulfurization of real diesel fuel was carried out and a desulfurization efficiency of 88.6% was obtained in 50 min.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Jinglong Zhang,Zhenping Qin,Libin Yang,Hongxia Guo,Siyuan Han
The ionic liquid (1,3-dimethylimidazolium dimethyl phosphate ([MMIM][DMP])) synthesized by addition reaction was used to modify a commercial reverse osmosis (RO) membrane thorough activation method. The activation promoted modification process was completed within just 6−12 min under optimal condition of the immersion time of 4 min, activation temperature of 110 °C and activation time of 4 min. The variation of surface morphologies and properties of the RO membrane were characterized by SEM, AFM, water contact angle, FTIR, and the RO performance was evaluated by desalination of 1000 mg⋅L −1 NaCl aqueous solution. The results showed that the active layer of the modified RO membrane became thinner, smoother, and more hydrophilic with increasing of activation temperature. The IL modified membrane achieved water flux of 33.7 L m −2 h −1 and rejection of 93.2%, showing 62% higher water flux comparing to the pristine membrane and 2.6% decrease in salt rejection. Moreover, the IL modified membrane showed an enhanced anti-fouling property with 95.5% of normalized water flux recovery. This work provides a facile and efficient way to modify and improve separation performance and anti-fouling property of commercial thin film composite (TFC) RO membranes.
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高影响因子
危险品化学品经营许可证（带存储）