Journal of Materials Chemistry C
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2024
·
IF 5.7
Gangyi Zeng,Guangyao Liu,Tiantian Wang,Lingling Wen,Jiangning Li,Yan Meng,Ziqiu Ren,Xin Li
Triple-cation CsFAMA perovskite solar cells (PSCs) have gained great attention because of their excellent stability. Buried interface management is one of the most effective methods to further improve device performance; however, such a strategy has not been extensively studied in air-processed triple-cation PSCs. Herein, we report an effective management strategy that incorporates ionic liquids (ILs) of 1-butyl-3-methylimidazole hexafluorophosphate (BMIMPF6) to modify the buried interface. The synergistic effect of BMIMPF6 is revealed by employing several characterization methods, including time-of-flight secondary ion mass spectrometry and inductively coupled plasma mass spectrometry. It was found that BMIMPF6 can significantly coordinate with Sn4+ and fill the oxygen vacancy defects from one side of the electron transport layer, and simultaneously bond with uncoordinated Pb2+ from the other side of the perovskite layer, leading to reduced nonradiative recombination losses and enhanced carrier extraction. More importantly, such an IL “bridge” enabled BMIMPF6 to exist at the buried interface, which avoids damage to the passivating layer in the next spin-coating process for achieving the perovskite film. Moreover, BMIMPF6 also penetrates the perovskite film and regulates the crystallinity of perovskite. As a result, the BMIMPF6-modified device fabricated in ambient air without glove boxes or dry rooms delivers a champion power conversion efficiency (PCE) of 21.74%. The unencapsulated device maintains 77.5% of its initial PCE after being stored in ambient air for more than 3500 h. Additionally, the lead leakage rate from the perovskite film is reduced. This work provides a facile and low-cost method to fabricate high-performance all-air-processed PSCs.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Xiaolu Yin,Jun Li,Xiaoxia Liu,Kaiqiang Huang,Yanzhao Yang
The recovery of palladium from spent auto-exhaust catalysts (SAE-catalysts) is of great significance for resource sustainability. Herein, we proposed an efficient closed-loop leaching and recovery method for palladium from SAE-catalysts using iodotrihalide ionic liquids (ILs). Recovery design was explored aimed at green leaching and process simplification. Iodotrihalide ILs exhibited exceptional performance in terms of leaching efficiency (99.1%), selectivity (selectivity > 6.8 ×10 3 ) and reusability (over 6 cycles). The mechanism study revealed that excellent leaching performance was attributed to the redox and complexation. Additionally, the chemical reaction-controlled model was best suited to describe the leaching process. Notably, under the optimal conditions determined by the response surface methodology, a high-purity Pd(II) solution (purity > 99.8%) was obtained. More significantly, it was ideal for practical applications due to the low-viscosity (36.0 cP), mild (55 °C) and one-step leaching and recovery. In conclusion, this work provides an eco-friendly method for recovering palladium from SAE-catalysts with its non-high corrosiveness and low environmental impact.
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PubMed
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2012
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IF 3.696
Lijuan Shi,Liqiang Zheng
The aggregation behavior of surface active imidazolium ionic liquids (ILs) with different alkyl chain length, cations, and counterions, namely, 1-alkyl-3-methylimidazolium bromide ([Cnmim]Br (n = 8, 10, 12)), 1-dodecyl-2,3-dimethylimidazolium bromide ([C12bmim]Br), 1-(2,4,6-trimethylphenyl)-3-dodecylimidazolium bromide ([C12pim]Br), and 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12mim][BF4]) in a protic room temperature IL, ethylammonium nitrate (EAN), was investigated through surface tension measurements and 1H NMR spectroscopy. Surface tension results show that surface properties and micellization behavior of surface active ILs in EAN are significantly affected by the structure of the cations, the basicity of counterions, and the hydrophobicity of alkyl chains. A detailed analysis of chemical shifts of various protons of surface active ILs and EAN was employed to investigate the micelle formation mechanism. Hydrogen bonding interaction is found to occur between the protons at C-2 on the imidazolium ring and the oxygen atoms in [NO3]− anions, and the interaction varies as a function of the basicity of the counterions and the hydrophobicity of the side-chains bonded to the imidizolium ring. The micelle formation may be accompanied by a partial changeover from trans to gauche conformations in the alkyl chain. The solvophobic effect may exist between the hydrophobic portion of [CH3CH2NH3]+ and the hydrophobic chains of the surface active ILs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Shen Wang,Meng Rong,Lin-Bing Sun,Yunze Zhao,Huifang Xing,Liangrong Yang
Indeed, the efficient and sustainable recovery of lithium from highly concentrated sodium-containing mother liquors of Li 2 CO 3 and salt-lake brines remains a significant challenge. Herein, two typical Li + recognition receptors, namely benzo-12-crown-4 and thenoyltrifluoroacetone, were separately introduced into the cationic and anionic parts to successfully synthesize novel bi-functionalized task-specific ionic liquids [(B12C4)C n im][TTA] (n = 4, 6, 8). A new, green, and high-efficiency extraction system has been developed by dissolving [(B12C4)C 6 im][TTA] in commercial room-temperature ionic liquid 1-hexyl-3-methyl-imdazolium bis(trifluromethylsulfonyl)imide [C 6 mim][NTf 2 ], without the addition of any other co-extractants. The newly developed [(B12C4)C 6 im][TTA]-[C 6 mim][NTf 2 ] extraction system exhibited a wide pH working range (4.0–11.0), high lithium extraction efficiency (95.4 %), as well as superior separation factors of Li/Na (β Li/Na = 2154.0) and Li/K (β Li/K =757.2). The extraction mechanism involving cation exchange was determined through slope analysis, ion chromatography, UV–vis spectroscopy and FT-IR spectra measurement, indicating that one [(B12C4)C 6 im][TTA] molecule can interact with two lithium ions and form a 1:2 complex. Moreover, the [(B12C4)C 6 im][TTA]-[C 6 mim][NTf 2 ] extraction system also demonstrated fast extraction kinetics, facile stripping and regeneration, along with good cycling performance. Furthermore, a multi-stage countercurrent extraction process to extract lithium from the simulated mother liquor of Li 2 CO 3 was evaluated. When the volume ratio (O/A) of oil phase (O) to water phase (A) was 1.0, only two theoretical extraction stages were needed to extract 91.4 % of lithium into the organic phase. Thus, the [(B12C4)C 6 im][TTA]-[C 6 mim][NTf 2 ] extraction system is promising for lithium extraction from mother liquor of Li 2 CO 3 and salt-lake brines. This study also opens the avenue for designing cationic and anionic bi-functionalized ionic liquids for metal ion separation.
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CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Jielin Huang,Jie Wang,Haonan Duan,Songsong Chen,Junping Zhang,Li Dong,Xiangping Zhang
Catalysts for CO 2 value-added conversion have been extensively explored, but there is still a lack of systematic design for catalysts that achieve efficient CO 2 conversion under mild conditions. Herein, we explored a mesoporous CeO 2 single-crystal formed with the regulation of ionic liquids, which catalyzed the effective carbonylation reaction with CO 2 under mild reaction conditions. By altering the synthetic environment, a series of uniform mesoporous CeO 2 particles with atomically aligned single-crystal frameworks were constructed, which have different surface physicochemical properties and primary aggregation degree. The prepared mesoporous CeO 2 single-crystal achieved efficient activation of CO 2 and alcohols at 0.5 MPa CO 2 and 100 °C, and the CeO 2 -IL-M catalyst shows optimal catalytic performance in the synthesis of ethylene carbonate with 46.22 mmol g –1 h –1 , which was 50.6 times as high as that of the CeO 2 obtained without ionic liquids. Subsequently, the catalytic pathway and mechanism of carbonylation reaction with CO 2 on mesoporous CeO 2 single-crystal were studied via React-IR spectra and C 18 O 2 labeling experiments. The research provides a new strategy for controllable nanoscale assembly of mesoporous single-crystal materials and expands the application range of single-crystal materials, aiming to develop novel catalytic materials to meet industrial needs.
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Reaction Kinetics Mechanisms and Catalysis
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2017
·Vol. 121
·期 2
·579-592
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IF 1.264
Zhang Hui,Li Yuqi,Lu Zexiang,Wu Mei,Shi Ronghui,Chen Lihui
Five SO 3 H and CF 3 SO 3 H-functionalized ionic liquids (ILs) with different acidity were synthesized. The catalytic performances of various ILs were evaluated for producing biodiesel in the esterification reaction and the yield of biodiesel increased with the increase of ILs’ acid strength. [Bsmim]CF 3 SO 3 was found to be a highly-efficient catalyst for increasing the biodiesel yield due to its greatly enhanced Brønsted acidity, and it was also an environmental friendly solvent for its good recyclability and hydrophilicity. The experimental design and study were carried out by using the response surface methodology (RSM) for optimizing the production process. The optimum biodiesel yield of nearly 99% was achieved at the conditions that the catalyst amount of 11%, the molar ratio of methanol to oleic acid of 9:1, the reaction time of 3 h and the reaction temperature of 62 °C were used. In addition, the catalyst showed an excellent reusability.
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RSC Advances
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2016
·Vol. 6
·期 43
·37110-37117
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IF 3.289
Mingjuan Han,Zheng Gu,Chong Chen,Zuowang Wu,Yigen Que,Qiang Wang,Hui Wan,Guofeng Guan
A new, simple and effective strategy to confine dicationic acid ionic liquids (DAILs, 1,4-bis[3-(propyl-3-sulfonate) imidazolium] butane hydrogen sulfate) in the cages of MIL-100(Fe) frameworks was constructed. The target catalyst, defined as MIL-100(Fe)@DAILs, was characterized by XRD, FTIR, SEM, TEM, EA, TGA and N2 adsorption–desorption. Meanwhile, the catalytic activity of the MIL-100(Fe)@DAILs catalyst was evaluated by the esterification reaction with oleic acid and methanol. The results indicated that the DAILs had been effectively encapsulated within the cages of the MIL-100(Fe) frameworks. Moreover, the influence of reaction time, reaction temperature, molar ratio of methanol to oleic acid and catalyst dosage on the conversion of oleic acid was studied by univariate analysis. The conversion of oleic acid decreased from 93.5% to 86.0% when the catalyst was reused five times, which indicated that the target catalyst possessed higher catalytic activity and superior catalytic activity. Finally, an esterification mechanism catalyzed by this novel catalyst was illustrated.
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JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
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2016
·Vol. 93
·期 6
·757-764
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IF 1.505
Shangde Sun,Xulei Li
An efficient route to preparing biodiesel by the esterification of ricinoleic acid (RA) with methanol was investigated in the work. Six kinds of functional ionic liquids (IL) were selected as catalysts. The effects of reaction variables (reaction time, temperature, IL load, and the ratio of reaction substrates) were also evaluated and optimized using response surface methodology (RSM). Among IL tested, 1-butylsulfonic-3-methylimidazolium trifluoromethanesulfonate showed the highest catalytic efficiency for the esterification. Reaction variables were optimized using RSM as follows: IL load 4 % (relative to the weight of RA), molar ratio of methanol to RA 9.2:1, 67 °C, and 28 min. Under the optimized conditions, the esterification degree of RA was 92.3 ± 1.7 %.
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THERMOCHIMICA ACTA
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2016
·
IF 1.938
Shengjiao Chen,Chengle Wang,Juan Li
The structure-property relationship of a series of polyoxo-metalates based ionic liquids (PILs) modified polypropylene (PP)/Intumescent flame retardant (IFR) composites were studied. The results showed that the chemical structure of PILs has a great effect on properties of PP composites. The flame retardancy of PP/IFR/PILs composites with a shorter alkyl group are better than that with a longer alkyl group. The PP/IFR/PIL composite with 0.5 wt% PIL with 1-butyl-3-methyl imidazole and 14.5% IFR gets the UL-94 V-0, but achieving the same UL-94 grade needs no less than 19.5 wt% IFR and 0.5 wt% PIL with 1-octyl-3-methyl imidazole. In addition, PILs modified by different groups have great effects on the mechanical properties, the PP/IFR/PIL composites containing 1-dodecyl-3-methyl imidazole obtain the best notch impact strength. The results show that the flame retardant and mechanical properties of PP/IFR/PILs composites can be tailored by changing the cation structure of PIL.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Bo Yuan,Jin Guan,Jun Peng,Guang-zhou Zhu,Ji-hong Jiang
Ionic liquids (ILs) with catalysts have been widely investigated in the production of 5-hydroxymethylfurfural (5-HMF) from biomass, in particular those which are high in cellulose. In this study, a series of hydrophobic imidazolium ionic liquids and magnetic-chitosan metallo-porphyrin particles (MCMP-M) were designed and their abilities to convert 5-hydroxymethylfurfural (5-HMF) and total reducing sugars (TRS) from the corncob were evaluated. The results showed that [moMIM][PF 6 ] and MCMP-Al were suitable solvents and both the catalysts were effective for the 5-HMF and TRS conversion (52.47 and 31.06, respectively). The mixed catalysts (MCMP-Al, Cr and Mg) coupled with [moMIM][PF 6 ] could increase the conversion yield of 5-HMF and TRS (66.58% and 43.68% in 50 min, respectively) with infrared radiation heating during distillation under reduced pressure for a short time (50 min). More importantly, the products could be separately recovered through the aqueous phase and the ILs and catalysts could be reused up to 40 times despite the slight loss of its catalytic activity. Moreover, the catalyst system also could be used for other carbon sources to produce the 5-HMF.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Tongtong Tian,Jieqiong Qin,Yan'an Gao,Li Yu
The present work aims to systematically study the aggregation behavior of one halogen-free surface active ionic liquid (SAIL), i.e., 1-butyl-3-methylimidazolum dodecylsulfonate ([C 4 mim][C 12 H 25 SO 3 ]), in water and ethylammonium nitrate (EAN), respectively. Multiple-state ordered aggregates, viz. lyotropic liquid crystals (LLCs) (normal hexagonal and laminar lyotropic liquid phases, i.e. H 1 and L α phases) and lamellar gels, were facilely tuned only by the concentration of SAIL or solvent type. Furthermore, it is particularly interesting that LLC phases were constructed in H 2 O while lamellar gels were obtained in the EAN media environment, which were characterized by polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS). According to the investigative SAXS patterns, some structural parameters were calculated, suggesting that a higher concentration of SAIL results in a denser arrangement whereas an opposite trend generates because of a higher temperature. FT-IR spectra and density functional theory (DFT) calculations reveal that both strong H-bonding and electrostatic interactions between EAN and the headgroups of [C 4 mim][C 12 H 25 SO 3 ] facilitate gelation . For the self-assembled lamellar gels formed by [C 4 mim][C 12 H 25 SO 3 ] in EAN, a thermally reversible sol–gel transition was observed by differential scanning calorimetry (DSC). The rheological results show that the H 1 phase formed by [C 4 mim][C 12 H 25 SO 3 ] in water exhibits a viscoelastic gel-like behavior among the whole frequency region while L α phase displays a viscous behavior at lower frequencies and an elastic behavior at higher frequencies. This work is expected to set a basis for application of the eco-friendly halogen-free SAIL in some fields, e.g. electrochemistry , supramolecular chemistry and drug delivery.
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REACTIVE & FUNCTIONAL POLYMERS
·
2016
·
IF 2.725
Na Tian,Xufeng Ni,Zhiquan Shen
Imidazolium-functionalized hyperbranched polymeric ionic liquids (HPILs) are synthesized by one-step reaction between tri-imidazolium-based ester (A 3 monomer) and dihaloalkane (B 2 monomer), which can act as efficient stabilizers in the preparation of silver nanoparticles . The particle size and solubility of nanoparticles mainly depend on the chemical structure of stabilizer, molecular weights of HPILs, and concentration of reagent. The obtained HPIL-encapsulated Ag nanoparticles were characterized by ultraviolet–visible (UV–Vis) absorption and transmission electron microscopy , showing a uniform size distribution and appreciable stability in water for a longer period.
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危险品化学品经营许可证（带存储）