ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yu Liu,Longlong Chen,Jiangbin Su,Jinmei Bai,Zuming He
In this study, amorphous WO 3 thin films were deposited on indium-tin oxide substrates using radio frequency magnetron sputtering. Anhydrous ethanol (AE) and propylene carbonate (PC) served as binary solvents, with the WO 3 films evaluated in AE + PC-LiClO 4 electrolytes. By adjusting the volume percentage of AE, the physical properties of the electrolytes were modified to improve the fluidity and wetting behavior. The analysis of several aspects, such as migration of ions, capillary flow of electrolyte and electrochemical reaction rate, highlights the important influence of AE + PC binary solvent in reducing the response time. Notably, WO 3 films in AE + PC-LiClO 4 electrolyte with a 7/8 volume percentage of AE demonstrated exceptional optical modulation (Δ T = 75.7 %) and fast response times ( t c = 6.41 s, t b = 2.29 s), alongside shortened the diffusion path, increased ion diffusion coefficients ( D a =4.4678 × 10 −10 cm 2 /s, D c = 8.2968 × 10 −10 cm 2 /s) and electrochemical active area. Based on these efforts, the feasibility of applying AE + PC binary solvent to WO 3 electrochromic thin films has been confirmed. These results offer valuable insights for the development of efficient electrolytes and their application in electrochromic devices.
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
·
2024
·
IF 3.5
Le Zhou,Xin Zhang,Yu Han,Xin Li,Ze-Quan Zeng,Hai-Kui Zou,Yong Luo
The Co@NC catalyst exhibits significant protic solvent preference for hydrogenation of nitriles to primary amines. However, the effect of mixed protic solvents on catalytic hydrogenation has received little attention. Herein, the synergetic solvent effect has been proposed to accelerate the hydrogenation of adiponitrile (ADN) to hexamethylenediamine through H 2 O-ethanol hydrogen bond networks on Co@NC catalyst. Experimental screenings on solvents showed that ADN conversion in H 2 O-ethanol was 1.6 ~ 5.1 times greater than in single solvents. Kinetic models in H 2 O/ethanol ( v W = 0.6), H 2 O, and ethanol showed that the solvents effected on H 2 transformation dominated the reaction. Isotope labelling and kinetic experiments revealed that H 2 O and ethanol acted as co-catalysts through exchanging and transferring hydrogen via hydroxyl groups. Density functional theory calculations confirmed that the energy barrier for proton transfer mediated by H₂O–ethanol was reduced by 0.18 eV compared to proton transfer mediated by H₂O–H₂O dimers.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·588-594
·
IF 1.338
Xu Lihuan,Huang Qifei,Su Chang,Zhu Xiaogang,He Huihui,Zhang Cheng
In this paper, LiFePO4 samples were synthesized in the water/ethanol mixture solvent environment with different volume ratio of water/ethanol, and the effects of different solvent environment (different water/ethanol ratio) on the morphology, the crystal structure and the
cell performances were studied in detail. The prepared samples were investigated comparatively by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and various electrochemical testing techniques. The results showed that the water/ethanol ratio
seriously affected the crystal structure, the micro-morphologies and the electrochemical properties of the resulting LiFePO4-based electro-active material. And the growth of [010] direction of LiFePO4 crystal was limited with the increase of alcohol proportion in the
mixed solvent, while the size of obtained particles became small in the same process. In addition, LiFePO4 samples obtained at high alcohol content presented the improved specific capacity and rate performances. Specially, the LFP-D electrode displayed the discharge capacity of
153.2 mAh·g−1 at the rate of 0.1 C and the improved rate performance of 150.6, 143.6, 133.8, 121.4, 99.5 and 78.2 mAh·g−1 at 0.2 C, 0.5 C, 1 C, 2 C, 5 C and 10 C, respectively.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2019
·Vol. 40
·期 6
·2534-2538
·
IF 2.268
Yadong Wu,Fang Wang,Yudong Huang
Favorable mechanical strength, thermal stability and transparency are important to polymeric composite membranes. Addressed herein is a facile fabrication and performance comparison of aramid nanofiber (ANF) membrane formed by water or ethanol. FTIR and XRD showed that no structural damage occurred in ANFs despite reduction in diameter. Both the two kinds of membrane demonstrated extraordinary thermal stability with a decomposition at above 500°C. High mechanical strength and different hydrophilic characteristics pave a way for expanding composites membranes with considerable attractive functionality. POLYM. COMPOS., 40:2534–2538, 2019. © 2019 Society of Plastics Engineers
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2015
·Vol. 140
·期 15
·5205-5215
·
IF 4.107
Shaodong Sun,Yuexia Sun,Anran Chen,Xiaozhe Zhang,Zhimao Yang
Inspired by a sequential hydrolysis–precipitation mechanism, morphology-controllable hierarchical cupric oxide (CuO) nanostructures are facilely fabricated by a green water/ethanol solution-phase transformation of Cux(OH)2x−2(SO4) precursors in the absence of any organic capping agents and without annealing treatment in air. Antlerite Cu3(OH)4(SO4) precursors formed in a low volume ratio between water and ethanol can transform into a two-dimensional (2D) hierarchical nanoporous CuO ribbon assembly of free-standing nanoneedle building blocks and hierarchical nanoneedle-aggregated CuO flowers. Brochantite Cu4(OH)6(SO4) precursors formed in a high volume ratio between water and ethanol can transform into hierarchical nanoplate-aggregated CuO nanoribbons and nanoflowers. Such 2D hierarchical nanoporous CuO ribbons serving as a promising electrode material for nonenzymatic glucose detection show high sensitivity, a low detection limit, fast amperometric response and good selectivity. Significantly, this green water-induced precursor-hydrolysis method might be used to control effectively the growth of other metal oxide micro-/nanostructures.
研究领域:
材料科学
·
生物传感
·
化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Jie Wang,Meisheng Li,Shouyong Zhou,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong
Highly water-selective hybrid pervaporation membranes with excellent water/ethanol separation performance and superior water channels were fabricated by incorporating graphitic carbon nitride (g-C 3 N 4 ), activated g-C 3 N 4 (O-g-C 3 N 4 ) and polydopamine modified g-C 3 N 4 (PDA@O-g-C 3 N 4 ) nanosheets into poly(vinyl alcohol) (PVA) matrix. The nonselective polymer/inorganic interface channels between PVA and g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 in hybrid membranes were controllable constructed through hydrogen bonds, rigid and flexible chemical bonds, respectively. The membrane performances were tested in the pervaporation (PV) process for the dehydration of 90 wt% ethanol/water mixtures at 75 °C. The results revealed that with the increase of binding force among polymer/inorganic interface, from hydrogen bonds (CPVA-g-C 3 N 4 ), to rigid (CPVA-O-g-C 3 N 4 ) and flexible chemical bonds (CPVA-PDA@O-g-C 3 N 4 ), the total flux decreased from 4634 to 2328 g/(m 2 h) and the separation factor increased from 32.4 to 57.9. It is implied that the nonselective polymer/inorganic interface channels were controlled successfully. Meanwhile, compared with the pure cross-linked PVA (CPVA) membrane (total flux 2325 g/(m 2 h) and separation factor 18.7), incorporation of g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 could all lead to an increase of surface hydrophilicity of the CPVA membranes along with an increase in membrane tortuosity and membrane water-selective channels that was favorable to the selective permeation of water molecules. Namely, these new hybrid membranes can break the “trade-off effect” effectively. Moreover, due to the ordered alignment of g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 nanosheets and the strong interfacial interactions among these nanosheets, succinic acid (Sa) and the PVA matrix, the hybrid composite membranes showed both high swelling resistance and mechanical stability.
研究领域:
材料科学
·
化学工程
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Membranes
·
2023
·
IF 0
Qing Xia,Tengyang Zhu,Zhengze Chai,Yan Wang
Chitosan (CS) membranes have been widely applied in water/ethanol separation via membrane-based pervaporation, but a bottleneck in the practical application always exists due to their severe swelling behavior in aqueous solution and consequently low permeation flux due to the large membrane thickness. Here, thin film composite (TFC) hollow fiber (HF) membrane with an in-situ-crosslinked ultrathin CS selective layer is developed via multiple supramolecular interaction-crosslinking strategy for efficient water/ethanol separation via pervaporation. With Fe 3+ -phytic acid (PhA) complex pre-deposited on the substrate, the subsequently introduced CS selective layer is in-situ crosslinked via multiple supramolecular interactions, including coordination, electrostatic, and hydrogen bonding interactions. By varying the cycle number of Fe 3+ /PhA assembly and the species of employed organophosphorus acid, the anti-swelling properties of the resultant TFC CS membrane is enhanced and the separation performance is maximized. The optimal TFC-CS-Fe 2 PhA 2 membrane with two cycles of Fe 3+ /PhA assembly has a selective layer thickness of 60 n m and a corresponding ultrahigh flux of 2.87 kg/m 2 h, coupled with a permeate water concentration of 99.5 wt% and good long-term stability for the dehydration of 85 wt% ethanol aqueous solution at 50 °C. The supramolecular interaction-crosslinking presented in this work provides an efficient and promising strategy for the construction of TFC CS membrane with excellent anti-swelling property and superior separation performance.
研究领域:
材料科学
·
化学工程
·
膜分离技术
✓ 已验证
DOI
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Feng Liang,Dongxu Liu,Shurui Dong,Jing Zhao,Xingzhong Cao,Wanqin Jin
Zwitterions with super-hydrophilic feature are promising membrane materials for water-selective permeation process. However, the applications of zwitterionic materials in membrane are mainly restricted to surface modification or acting as minor additive, while the construction of zwitterionic membrane matrix remains challenging. Herein, we proposed a facile approach to constructing polyzwitterion membrane via direct assembly of graphene oxide (GO)-based core-brush nanosheets . The in situ free radical polymerization of sulfobetaine methacrylate (SBMA) monomer on GO surface ensures the ultra-high grafting amount of poly(sulfobetaine methacrylate) (PSBMA) brushes and then results in the polymer-dominated structure of PSBMA@GO membrane (polymer content high to 83%) instead of the ordered laminar structure in common GO-based membranes. Meanwhile, the original functional groups on GO can be retained after grafting PSBMA, which act as reactive sites for subsequent cross-linking and structural manipulation. Because of the exceptionally high hydration ability and water affinity of PSBMA brushes from the high-density ionic groups, and the densified membrane structure through incorporating the optimized amount of ethylenediamine (EDA) cross-linker, the as-prepared polyzwitterion membrane obtains an excellent water/ethanol separation performance with the separation factor of 1420 and the permeate flux of 5.20 kg/m 2 ·h (70 °C, 20 wt% water in feed), which shows remarkable superiority compared with the reported polymeric membranes . The strategy proposed here provides a novel pathway for constructing polyzwitterion membranes with high separation efficiency, and can be applied with a greater scope of monomers.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yumeng Zhao,Guoshu Gao,Peng Zhu,Haiou Liu,Yu Guo,Xiongfu Zhang
Purification and dehydration of ethyl acetate are important processes in chemical production, and the preparation of stable and efficient pervaporation membrane materials has still been a challenge. In this work, a well-intergrown polycrystalline Al-Fum@CS tubular membrane was successfully prepared by a synergistic strategy involving seeded growth combined with surface remediation and applied for the first time in the separation of a multicomponent mixture containing ethyl acetate by pervaporation. By regulating the synthesis conditions, a continuous Al-Fum membrane with thickness of 1.7 μm was initially grown within the innermost part of a uniform seed layer. Subsequently, a chitosan (CS) layer was introduced onto the membrane to fabricate the Al-Fum@CS membrane. This CS layer significantly modifies the defects existing in the membrane surface. The obtained Al-Fum@CS membrane with the thickness of around 1.8 μm is dense and has strong hydrophilicity. It can preferentially separate water from a ternary azeotropic mixture of water–ethanol–ethyl acetate and displays high pervaporation performance with a permeation flux of 1.88 kg/(m2·h) and a separation factor of ∼6000 at 60 °C. Especially, the Al-Fum@CS membrane can be continuously operated for more than 150 h without any obvious change in separation performance, showing excellent ultrahigh stability. Moreover, the as-prepared membrane has good acid resistance and reusability in complex environments according to the results of multiple mixture pervaporation experiments. Therefore, the Al-Fum@CS tubular membrane has great industrial application potential for the purification of ethyl acetate produced from the esterification reaction.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2014
·Vol. 21
·期 5
·3597-3611
·
IF 3.033
Wang Xue-San,An Quan-Fu,Zhao Feng-Yang,Zhao Qiang,Lee Kueir-Rarn,Qian Jin-Wen,Gao Cong-Jie
Novel polyelectrolyte complexes based on sulfated carboxymethyl cellulose and chitosan were prepared, containing strongly charged (sulfate (OSO 3 )) and weakly charged (carboxylate (COO − )) groups (SPECs). SPEC homogeneous membranes (SPECMs) for the pervaporation dehydration of ethanol–water mixtures were investigated. The chemical structures and compositions of SPECMs were characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectra. The swelling behavior and separation performance of SPECMs in low pH feed were evaluated. It was found that the SPECMs containing OSO 3 groups were resistant to acidic feeds and showed very good separation performance even in low pH feed. For instance, the water content in permeate for SPECM-0.35 reached as high as 95.8 wt%, which was much higher than the 60 wt% for SPECM-0 in the dehydration of water–ethanol mixtures with pH 2. The result was attributed to the interplay between the stable complexation formed by OSO 3 groups and the improved ionization degree of COO − groups in SPECMs. Moreover, the SPECMs maintained their operation stability against acidic feeds. The SPECMs could find considerable potential application in the pervaporation dehydration of acidic feeds, especially for enhancing the conversion of ester condensation.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 2
·583-591
·
IF 8.867
Hao Yang,Hong Wu,Zhaoquan Yao,Benbing Shi,Ziang Xu,Xuanxuan Cheng,Fusheng Pan,Guanhua Liu,Zhongyi Jiang,Xingzhong Cao
Natural materials are often arranged in intricate gradient architectures to implement specific functionalities. Implanting such an exquisite prototype into synthetic membranes remains a grand challenge in real-world applications. In this study, functionally graded membranes are fabricated through a surface segregation method using 2D nanoporous COF TpHZ and poly(ether sulfone) as composite building blocks. During the membrane formation, the COF nanosheets can spontaneously migrate from the membrane bulk to the membrane surface to form a gradient distribution, which can be varied by manipulating the COF addition content and phase inversion temperature. The highest COF content on the membrane surface can be up to 50.90 vol%. Due to the formation of a graded structure, the membranes are endowed with remarkably increased hydrophilicity and free volume characteristics. Accordingly, the optimized membrane exhibits a permeation flux of 2.48 kg m−2 h−1 and a high separation factor of 1430, and remains robust during a stability test for 320 h, and is one of the most efficient mixed matrix membranes for water/ethanol separation. The separation factor is two orders of magnitude more than that of existing commercial membranes. The concept of functionally graded membranes can be applicable to the development of a broad range of high-performance materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Silicon
·
2018
·Vol. 11
·期 1
·287-292
·
IF 1.246
Kang Zhen-Wei,Gao Zhan-Chen,Lv Su-Fang,Zhang Fei-Bao,Jiang Jian-Xiong
Palladium nanocatalysts supported on commercial fumed silica were synthesized via a convenient liquid method without any external reductant or surfactants. The catalysts were characterized by inductively coupled plasma-mass spectrometry, X-ray powder diffraction and the transmission electron microscope analysis. Then it was applied for Suzuki-Miyaura cross-coupling reactions. It was found that a number of aryl halides were efficiently catalyzed using these catalysts in aqueous-ethanol under relatively mild condition within 0.5h. Further study showed that the catalyst could be recycled up to 10 times without loss of activity.
Palladium nanocatalysts supported on commercial fumed silica were synthesized and applied for Suzuki-Miyaura cross-coupling reactions. A number of aryl halides were efficiently catalyzed using these catalysts in aqueous-ethanol under relatively mild condition within 0.5h. Further study showed that the catalyst could be recycled up to 10 times without loss of activity.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）