ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xinxiang Chen,Huiqun Liu,Mingzhe Zhou,Guozhao Fang,Haimin Zhang,Zhenyang Cai,Xiaojun Zhao,Lairong Xiao,Sainan Liu,Yi Zhang
ABSTRACT Sodium-ion batteries (SIBs) are one of the most potential candidates for large-scale energy storage due to the low cost and eco-friendliness, however, a stable and reversible anode is urgently developed. In this work, a novel 2 × 2 tunnel-structured K 1.28 Ti 8 O 16 @N-doped carbon nanofibers (KTO@N CNFs) anode is successfully synthesized via simple electrospinning and subsequent thermal treatment with urea acted as the additional convenient nitrogen source. In-situ X-ray diffraction (XRD) measurement confirms the intercalation reaction mechanism and robust structure during Na + insertion/extraction. This composite material exhibits a reversible capacity of 116.4 mAh g − 1 at a current density of 100 mA g − 1 after 1000 cycles. More impressively, even at a high current density of 1 A g − 1 , the battery delivers capacity retention of 98.4 mAh g − 1 after 5000 cycles. The excellent electrochemical performance is attributed to the adequate 2 × 2 tunnel structure and the nano-confinement of N-doped nanofibers on K 1.28 Ti 8 O 16 nanocrystals, which offers enough diffusion paths and enhance the ionic diffusion of sodium ions. This work provides a facile strategy to synthesis stable, reversible, and long-cycle anode for sodium-ion batteries.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Yun-Jiao Ma,Xiao-Yuan Wang,Bei-Wei Zhu,Ming Du,Liang Dong,Xiu-Ping Dong,Xian-Bing Xu
Vinylpyrazine compounds are widely present in foods , especially in hot-processed foods, as a class of flavor compounds ; however, their formation mechanism in food systems is still unclear. Therefore, in this study, 2-vinylpyrazine and 2-vinyl-6-methylpyrazine were identified in the Maillard model reaction of d -glucose and glycine. The Maillard model reaction of glucose–glycine was constructed to explore the effects of reaction parameters on vinylpyrazines and the related products. The Maillard reaction of [U- 13 C 6 ] glucose and glycine was established, and alkylpyrazines and formaldehyde were determined via isotope tracing technique as the precursors of vinylpyrazines. The formation of vinylpyrazines was verified by building a model reaction between alkylpyrazines and formaldehyde. The H/D exchange experiment confirmed that the active site of alkylpyrazines was on the methyl group , which was the reaction site for the condensation reaction of alkylpyrazines with formaldehyde. Results suggest that vinylpyrazines are formed by the condensation reaction of alkylpyrazines and formaldehyde.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Xingyu Han,FangFang Liu,Hanxiao Wang,Yangjing Liu,Shuhui Huo,Min Wang,Jianwei Ren,Xuyun Wang,Hongbing Song,Jian Liu,Rongfang Wang
Ni(OH) 2 /NF demonstrates strong electrocatalytic performance in the oxidation of 1-methoxy-2-propanol (MOP) to 1-methoxy-2-propanone (MOA). However, its catalytic efficiency is restricted by two sluggish dehydrogenation stages: the oxidation of Ni 2 + –OH to generate the active Ni 3+ –O intermediate, and the abstraction of the α-hydrogen from the MOP molecule. To address these limitations, the present study introduces a strategy centered on tuning the electronic structure. By incorporating manganese (Mn) into the coordination structure of Ni(OH) 2 /NF nanosheets in a controlled manner, both reaction steps are effectively enhanced through synergistic effects. X-ray photoelectron spectroscopy (XPS) and synchrotron-based X-ray absorption fine structure (XAFS) analyses reveal that Mn incorporation modifies the local electronic environment of Ni through electronic interactions. This adjustment decreases the d -orbital electron density of Ni, thereby facilitating the oxidation of Ni 2+ to the catalytically active Ni 3+ species during MOP conversion. Electrochemical measurements combined with density functional theory (DFT) calculations indicate that Mn incorporation markedly enhances the adsorption of MOP molecules on the catalyst surface, which thereby promotes more efficient reaction kinetics. This synergistic regulation effectively lowers the energy barrier associated with the dual dehydrogenation steps, resulting in markedly improved catalytic performance of Mn–Ni(OH) 2 /NF for MOP oxidation, with the product Faradaic efficiency reaching around 90 %.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Tiantian Ping,Yu Dong,Shufeng Shen
Nonaqueous CO 2 absorbents, composed of secondary alkanolamines and 2-alkoxyethanols, have attracted much attention for an energy-efficient CO 2 capture process. In this work, densities and viscosities of partially CO 2 -loaded mixtures of 2-(butylamino)ethanol (BAE) + 2-butoxyethanol (EGBE) and 2-(ethylamino)ethanol (EAE) + EGBE were measured at atmospheric pressure over the temperature range of (293.15 to 353.15) K with amine mass fraction ( w 1 ) of (0.10, 0.30 and 0.50) containing various CO 2 loading. With increasing CO 2 loadings, significant increases in both density and viscosity were observed. Dimensionless ρ loaded · ρ CO2-free −1 and η loaded · η CO2-free −1 from the CO 2 -free and CO 2 -loaded systems were fitted by proposed correlations as a function of temperature, amine concentration and CO 2 loading. The calculated values of density and viscosity from the correlations are in good agreement with the experimental results, with AADs within 0.15% and 1.60% for density and viscosity respectively. The dramatic increase in viscosity of carbonated solutions was interpreted by the intermolecular interactions and the formation of ionic products in the mixtures based on the FTIR spectral results.
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MATERIALS RESEARCH INNOVATIONS
·
2022
·
IF 0
Wenyan Huang,Zhongwei Ge,Li Jiang,Hongjun Yang,Qimin Jiang,Bibiao Jiang,Xiaoqiang Xue,Yonglei Wang
A novel functional inimer 2-(2-bromoisobutyryloxy)ethyl methacrylate(BiBEM) both with the double bond and bromide was designed and synthesised. The branched polystyrene (PS) was prepared by the atom transfer radical polymerisation (ATRP), using BiBEM as inimer (initator) and CuBr complexed with bipyridine as catalysts in toluene at 80°C. The molecular weight and the branching degree of the polystyrene were analysed by using triple detection size-exclusion chromatography (TD-SEC) and the storage modulus in a wide and high-frequency range of polystyrene microrheological properties were studied by the diffusive wave spectroscopy (DWS). By adjusting the ratio of inimer to catalysts, a series of branched polystyrene polymers with different molecular weight and branching degree were obtained. The increase of the BiBEM concentration led to a higher degree of branching, while higher molecular weight and broader molecular weight distribution are accompanied. The branched polystyrene showed low storage modulus and lower chain entanglement compared to linear analogues.
研究领域:
高分子化学
·
材料科学
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ACTA PHYSICO-CHIMICA SINICA
·
2026
·
IF 13.5
Sijia Wang,Wen-Cui Li,Rui-Ping Zhang,An-Hui Lu
The selective hydrogenation of alkynols to alkenols is an industrially important route to fine chemicals, yet competing over-hydrogenation pathways make it challenging to maintain alkenol selectivity at high conversion. Herein, we report an ultrathin two-dimensional porous carbon support with a thickness of 13 nm and an aspect ratio of up to 615. Compared with conventional bulk carbon supports, this two-dimensional architecture provides a larger externally accessible surface area, thereby promoting Pd dispersion and facilitating liquid-phase molecular diffusion. The resulting Pd catalyst achieves an exceptional reaction rate of 28617 mol mol Pd −1 h −1 for the semihydrogenation of 2-methyl-3-butyn-2-ol under mild conditions (298 K, 0.2 MPa H 2 ), representing a 31-fold enhancement relative to the commercial Lindlar catalyst, while maintaining 93% selectivity at 99% conversion. Moreover, the catalyst exhibits good stability over five consecutive cycles, with no detectable Pd agglomeration or leaching. This work highlights dimension control of carbon supports as an effective strategy to enhance external surface accessibility, offering new insights into the design of high-performance semihydrogenation catalysts. Download: Download high-res image (220KB) Download: Download full-size image Two-dimensional porous carbon supports promote Pd dispersion and molecular diffusion for efficient semihydrogenation of 2-methyl-3-butyn-2-ol.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·060538
·
IF 4.386
Jie Hu,Fei Yang,Changgan Lai,Helin Wang,Liu Nie,Jian Sun,Huan Zhou,Lixu Lei
Pb3(OH)2(CO3)2-acetylene black (BLC/AB) composite is successfully prepared by a simple and economical sonochemical method and employed as a negative additive for lead-acid batteries (LABs). The electrochemical measurements show that the obtained BLC/AB electrodes have a higher hydrogen evolution reaction (HER) overpotential compared to AB electrode. BLC/AB-2 and BLC/AB-4 battery deliver the excellent rate performance at 1C rate. What's more, acetylene black as nucleation centers of Pb3(OH)2(CO3)2 may considerably alleviate irreversible sulfation phenomenon of negative plate, thus enhancing the conductivity and extending the cycle life. Interestingly, the cycle life (1172) of BLC/AB-2 battery is 1.44 times that of the same amount of AB battery (814) at 1C rate. Therefore, the BLC/AB composite is a promising negative additive of LABs.
研究领域:
材料科学
·
电化学
·
能源存储与转换
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JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2014
·Vol. 140
·期 12
·04014044
·
IF 1.221
Huayong Luo,Qin Wang,Tao Tao,Tian C. Zhang,Aijiao Zhou
While forward osmosis (FO) has great potential to be the next generation water treatment technology, it is constrained by the development of ideal draw agents and membranes. Herein, a series of copolymerized hydrogels based on strong ionic monomer sodium 2-acrylamido-2-methylpropane sulfonate (AMPS-Na) and thermosensitive monomer ?-isopropylacrylamide (NIPAM) have been synthesized and used for the first time as draw agents in the FO process. The effects of the composition of poly(NIPAM-co-AMPS-Na) [P(NIPAM-co-AMPS)] hydrogels and operational conditions including draw agent concentrations, temperature, membrane orientation, salinity of feed solution, velocity of feed solution, and running times on the FO performance have been evaluated systematically. The results demonstrate that the water flux increases with increases of the content of AMPS-Na incorporated into the hydrogel and hydrogel concentration in the draw solution, e.g., from 0.40 LMH rising up to 2.85 LMH. Besides, the water flux increases by 18% as the temperature increases from 5 to 27°C. In addition, these hydrogels remained active even after five times regeneration and reuse with a total water flux decrease of less than 5%. Furthermore, these hydrogels have negligible reverse diffusion through the FO membrane as compared with the corresponding monomer mixture and NaCl, which may avoid possible contamination on the feed solution and lower the renewable cost. All these results indicate that these synthesized P(NIPAM-co-AMPS) hydrogels are promising draw agents for the FO process.
研究领域:
环境工程
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高分子科学
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水处理技术
·
膜科学
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Metabolites
·
2023
·Vol. 13
·期 3
·451
·
IF 4.1
Fujian Qin,Jiankang Li,Tianxiao Mao,Shuo Feng,Jing Li,Maode Lai
2-hydroxybutyric acid (2HB) serves as an important regulatory factor in a variety of diseases. The circulating level of 2HB in serum is significantly higher in multiple diseases, such as cancer and type 2 diabetes (T2D). However, there is currently no systematic study on 2HB-producing bacteria that demonstrates whether gut bacteria contribute to the circulating 2HB pool. To address this question, we used BLASTP to reveal the taxonomic profiling of 2HB-producing bacteria in the human microbiome, which are mainly distributed in the phylum Proteobacteria and Firmicutes. In vitro experiments showed that most gut bacteria (21/32) have at least one path to produce 2HB, which includes Aspartic acid, methionine, threonine, and 2-aminobutyric acid. Particularly,Fusobacterium nucleatumhas the strongest ability to synthesize 2HB, which is sufficient to alter colon 2HB concentration in mice. Nevertheless, neither antibiotic (ABX) norFusobacterium nucleatumgavage significantly affected mouse serum 2HB levels during the time course of this study. Taken together, our study presents the profiles of 2HB-producing bacteria and demonstrates that gut microbiota was a major contributor to 2HB concentration in the intestinal lumen but a relatively minor contributor to serum 2HB concentration.Keywords:2-hydroxybutyric acid;gut microbiota;HMP;taxonomic identification;Fusobacterium nucleatum
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JOURNAL OF SOLUTION CHEMISTRY
·
2023
·Vol. 52
·期 8
·921-939
·
IF 1.2
Guo Qiang,Lin Jinyuan,Yang Pengju,Jiang Yong,Zhang Binchuan,Zhu Longxin,Wang Xunqiu
Isobaric vapor–liquid equilibrium (VLE) data for 2-methylpyridine + 2-vinylpyridine binary systems have been measured using a dynamic circulation device with the pressure points 1.9 kPa, 4.0 kPa, and 5.3 kPa at temperature in the range from 302.8 to 348.5 K. The VLE data passed the thermodynamic consistency test by using L–W method, R–K method and Fredenslund method. The NRTL, Wilson and UNIQUAC models were used to fit the data and binary interaction parameters were obtained for the three models. For these models, the results showed that the calculated values of the model were in good agreement with the experimental values and could, thereby, be used for the design and optimization of distillation.
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BIOMACROMOLECULES
·
2023
·
IF 6.2
Songlin Xing,Qiqi Wang,Yang He,Li Chen
Polymer brushes with different topological architectures exhibit unparalleled interfacial and physicochemical properties and are being widely utilized in antifouling applications. However, there is an absence of a thorough understanding of the antifouling process of dynamic flow mediated by the topological structure of polymer brushes. Here, it is highlighted how the interface parameters related to biofouling in flowing carrier fluid are tuned by topologically different architectures. The mechanism by which three brushes with various topological structures (cyclic, looped, and linear brushes) encounter biological media was revealed by relating protein adhesion with nanomechanics and protein conformational transitions on poly(2-ethyl-2-oxazoline) (PEtOx) brushes. In contrast to the classically linear analogue, the cyclic PEtOx brushes confered an enhanced steric barrier and excellent lubrication at the critical density region. The impenetrable and smoother layer prevented the approach and shortened the residence time for protein on the surface, providing optimal antifouling properties at low shear rates. The looped brushes also significantly inhibited protein adhesion under prolonged high shear rates due to their unshakable conformational characteristics. These findings detailed a new evaluation framework behind polymer brushes of topology-driven biofouling repulsion under flow conditions and pointed the way toward a promising approach for the effectiveness of biomaterial design.
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Nanoscale
·
2022
·Vol. 14
·期 45
·16787-16796
·
IF 8.307
Yan Li,Hongrui Zhu,Junbo Duan,Youshen Wu,Daocheng Wu
Reticular 2-bromo-2-methylpropionic acid (BMPA) modified Fe3O4 nanoparticle aggregates with novel acoustic properties, namely the photoexcited audible sound (PEAS) effect, were prepared by a laser-induced irradiation method. Their morphology was observed by Lorentz transmission electron microscopy. Their chemical structure, crystal composition, and magnetic properties were analyzed using infrared spectroscopy, X-ray diffraction, and a magnetic property measurement instrument, respectively. It is found that the nanoparticle aggregates appeared reticular, with the size of the BMPA modified Fe3O4 nanoparticles being 5.5 ± 0.4 nm. The saturation magnetization values of the BMPA modified Fe3O4 nanoparticles and associated aggregates were 59.99 and 63.51 emu g−1, respectively. The reticular BMPA modified nanoparticle aggregates can produce strong PEAS signals under very weak laser irradiation with great stability and repeatability. The emitted PEAS signals possessed strong specificity, suitable decay time and a large amount of information under a very weak laser power and can be detected by the human ear without any special detection equipment. Subsequently, a heat transfer model was constructed for the simulation of the possible mechanism of the PEAS effect using COMSOL software. The simulation results showed that the aggregates have a fast heat transfer rate with the temperature increasing to 480 K in only 0.25 s and 600 K in 5 s, respectively, meeting the requirements of the vapor explosion mechanism. Therefore, we realized that the possible mechanism of the PEAS effect of the reticular BMPA modified Fe3O4 nanoparticle aggregates is laser-induced fast heat transfer and vapor explosion in situ, resulting in the observed audible sound phenomenon. This novel PEAS effect has potential for application in materials science, biomedical engineering and other fields.
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