ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Chaolumen Wu,Haibin Wang,Chenbo Liao,Jun Yang,Lei Li
A hybrid air-electrode composed of a mixture of fluorinated carbon (CF x ) and Ketjen black (KB) active carbon composite materials was prepared to improve performance of Li-O 2 battery . In the hybrid air-electrodes, four kinds of CF x materials including fluorinated graphite, fluorinated carbon fiber, fluorinated coke and fluorinated black carbon were utilized as lithium insertion materials. The physical properties and morphologies of the KB and CF x carbon materials were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Scanning electron microscopy (SEM) measurements. Compared with the conventional KB air-electrode, all the CF x /KB hybrid air-electrodes in Li-O 2 batteries showed higher specific discharge capacity, especially at high current density . Among these CF x /KB hybrid air-electrodes, the fluorinated graphite based electrode showed the best electrochemical performance in Li-O 2 battery due to its highest discharge capacity of the fluorinated graphite material in the Li/CF x primary battery, highest specific surface area, and highest total pore volume . The electrochemical performance of Li-O 2 and Li-air batteries using the hybrid air-electrodes with the different fluorinated graphite: KB weight ratio, including specific charge and discharge capacity, cycling stability and rate capability were systematically investigated. At a current density of 0.5 mA cm −2 , the fluorinated graphite based air-electrode delivered a high specific discharge capacity of 1138 mAh g −1 in Li-O 2 batteries, which was more than four times than that of the conventional KB air-electrode (265 mAh g −1 ) under same testing conditions. The battery assembled with the fluorinated graphite based air-electrode exhibited better cycling stability than that of the battery assembled with the conventional KB air-electrode.
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Nano Research
·
2024
·Vol. 17
·期 6
·5031-5039
·
IF 9.5
Li Wenxiang,Gao Shuo,Yang Chuanruo,Yang Juntao,Nisar Amjad,Xiang Guolei,Jin Junsu
In 2 O 3 is an effective electrocatalyst to convert CO 2 to formic acid (HCOOH), but its inherent poor electrical conductivity limits the efficient charge transfer during the reaction. Additionally, the tendency of In 2 O 3 particles to agglomerate during synthesis further limits the exposure of active sites. Here we address these issues by leveraging the template effect of graphene oxide and employing InBDC as a self-sacrificing template for the pyrolysis synthesis of In 2 O 3 @C. The resulting In 2 O 3 @C/rGO-600 material features In 2 O 3 @C nanocubes uniformly anchored on a support of reduced graphene oxide (rGO), significantly enhancing the active sites exposure. The conductive rGO network facilitates charge transfer during electrocatalysis, and the presence of oxygen vacancies generated during pyrolysis, combined with the strong electron-donating ability of rGO, enhances the adsorption and activation of CO 2 . In performance evaluation, In 2 O 3 @C/rGO-600 exhibits a remarkable HCOOH Faradaic efficiency exceeding 94.0% over a broad potential window of −0.7 to −1.0 V (vs. reversible hydrogen electrode (RHE)), with the highest value of 97.9% at −0.9 V (vs. RHE) in a H-cell. Moreover, the material demonstrates an excellent cathodic energy efficiency of 71.6% at −0.7 V (vs. RHE). The study underscores the efficacy of uniformly anchoring metal oxide nanoparticles onto rGO for enhancing the electrocatalytic CO 2 reduction performance of materials.
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MATERIALS CHARACTERIZATION
·
2024
·
IF 4.8
Di Wu,Benxuan Li,Zixuan Wang,Li Yuan,Haohui Ou,Zelong Li,Tianrong Yi,Yuedong Wang,Jidong Liu,Qiaoyan Hao,Xiaoliang Weng,Yu-Jia Zeng,Han Huang,Fangping Ouyang,Wenjing Zhang
Unidirectional growth, a novel and promising approach, is a key method for synthesizing large-scale single crystals of ultra-thin materials. In this study, we present a unique and convenient method for the growth of molybdenum dioxide (MoO 2 ) nanoflakes on a c-sapphire substrate, achieving uniform orientation. Specifically, the MoO 2 (100) and MoO 2 < 02 1 ¯ > are aligned parallel to sapphire(0001) and sapphire<1 2 ¯ 10>, respectively. A crucial observation in our study is the presence of a buffer layer between the as-grown MoO 2 and c-sapphire. This buffer layer is essential in overcoming the limitation of lattice mismatch , thereby facilitating the unidirectional growth of MoO 2 . The introduction of reductants , such as H 2 and sulfur vapor, is critical for the formation of this buffer layer. Electrical measurements indicate that the electrical conductivity of the as-grown MoO 2 nanoflake is approximately 3.91 × 10 6 S/m at 300 K, which is comparable to other metallic nanomaterials . In addition, magnetotransport measurements reveal that the as-grown MoO 2 nanoflakes exhibit a temperature-dependent linear magnetoresistance (MR) under magnetic fields . These findings not only demonstrate a method for the unidirectional growth of MoO 2 on the c-sapphire substrate but also have significant implications for the application of MoO 2 in transparent electrodes and the fabrication of integrated devices based on MoO 2 .
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高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 29
·期 4
·538-547
·
IF 1.975
Sun L,Ye X,Ding D,Kai L.
The aim of the present study was to evaluate the effects of two well-known natural antioxidants vitamin C (VC) and vitamin E (VE) on the antifungal activity of honokiol against Candida albicans . The broth microdilution method was employed to test the antifungal activities of honokiol with or without antioxidants in the medium against C . albicans strain. Intracellular reactive oxygen species (ROS) and lipid peroxidation were determined by fluorescence staining assay. Mitochondrial dysfunction was assessed by detecting the mitochondrial DNA and the mitochondrial membrane potential. We observed that VC could significantly potentiate the antifungal activities of honokiol while VE reduced the effectiveness of honokiol against C . albicans . In addition, VC accelerated honokiol-induced mitochondrial dysfunction and inhibited glycolysis leading to a decrease in cellular ATP. However, VE could protect against mitochondrial membrane lipid peroxidation and rescue mitochondrial function after honokiol treatment. Our research provides new insight into the understanding of the action mechanism of honokiol and VC combination against C . albicans .
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PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Wang Yao,Jiaojiao Zhao,Qiang Li,Chujie Yu,Xuli Ding
The development of high-performance anode material for sodium-ion batteries remains a challenge because of their low capacity, which limits their commercial application. Compared with carbon-based materials, metallic Sb and SnO-based anodes have received extensive attention because of their high theoretical specific capacity and safe working potential. The main problem faced is the serious volume expansion during charging and discharging, leading to irreversible loss of capacity and poor cycle life. In this paper, Sb/SnO@C composite material with adjustable ratio of Sb/SnO was prepared via electrospinning by encapsulating Sb and SnO particles in lantern-like carbon nanocages which connected through the nanofibers . The unique structure can not only effectively mitigate the volume changes during the cycle, but also provide multiple effective paths for ion and electron transport . The kinetic analysis is further performed with the assist of CV and EIS . The results show that the prepared composite can provide impressive Na + ions storage and transport performance, and can still deliver a reversible charging capacity of 413mAhg −1 after 200 cycles at a current density of 50mAg −1 , with a capacity retention ratio of 84%. This work provides a new strategy for the development of sodium ion batteries with high capacity and stable cycle performance.
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高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Sheng Liang,Chu Liang,Yang Xia,Haohui Xu,Hui Huang,Xinyong Tao,Yongping Gan,Wenkui Zhang
Lithium sulfide (Li 2 S) is regarded as a promising cathode material for lithium–sulfur (Li–S) batteries in terms of its high theoretical specific capacity of 1166 mAh g −1 and good compatibility with lithium metal-free anodes. However, Li 2 S suffers from poor cycling stability and rate capability resulted from the serious shuttle effect of lithium polysulfides and its low electronic and ionic conductivity . Here, we present a facile ball milling combined with carbon coating method to synthesize porous carbon-coated Li 2 S (Li 2 S@C) composites with a high Li 2 S content by using polystyrene (PS) as a carbon precursor. The Li 2 S@C composites show a high reversible specific capacity of 676 mAh g −1 (equal to 971 mAh g −1 sulfur) after 3 cycles at the current density of 0.1 A g −1 , superior cycling stability with an average decay rate of 0.18% per cycle over 200 cycles, and improved rate capability of 416 mAh g −1 at the current density of 1.0 A g −1 . The enhanced electrochemical properties of Li 2 S can be attributed to the porosity and core–shell structure of the Li 2 S@C composites, which increased the electronic and ionic conductivity of Li 2 S and alleviated the shuttle effect of intermediate lithium polysulfides in the discharge/charge process.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Q.Q. Xiong,J.J. Lou,X.J. Teng,X.X. Lu,S.Y. Liu,H.Z. Chi,Z.G. Ji
Exploring advanced cathode materials is critical for the development of large-scale lithium ion storage. Herein we report nitrogen-doped carbon (N-C) coated LiFePO 4 nanospheres (N-C@LFP) synthesized by a facile hydrothermal plus chemical polymerization method . N-C@LFP nanospsheres exhibit diameters of 400–700 nm and show core-shell structure with a thin N-C layer of ∼2.5 nm. As a cathode for lithium ion batteries (LIBs), N-C@LFP nanospheres present excellent electrochemical performance with higher electrochemical reactivity, better reversibility and smaller polarization as compared to the unmodified pristine LiFePO 4 nanospheres . The N-C@LFP electrode delivers superior specific capacity of 158.4 mAh g −1 after 200 cycles at 1 C and good rate capability (107.5 mAh g −1 at 30 C). The enhanced electrochemical performance is attributed to the conductive N-C layer coating with fast ion/electron transfer. The N-C@LFP nanospheres are thus promising for commercial application in high-energy & power LIBs.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 23
·13759-13771
·
IF 3
Li Wenjie,Long Jiangfeng,Liu Sijia,Wang Peng,Xu Linglin,Lai Yong
To assess the feasibility of using C-S–H seeds to boost the anti-mechanical vibration capabilities of concrete, this work evaluated the mechanical properties, hydration kinetics, phase assemblage of hydrates, and pore structure of Portland cement (PC) and slag cement mortars, at varying dosages of C-S–H seeds. Results reveal that the incorporation of C-S–H seeds negatively affects the vibration resistance of neat PC, while it effectively enhances the vibration resistance of slag cement. The addition of these seeds facilitates cement hydration and improves the early mechanical properties, which is evident in the shortened appearance time of the hydration exothermic peak by almost 50%. The remarkable vibration resistance observed in slag cement primarily stems from the synergistic effect between C-S–H seeds and slag. However, the premature formation of the internal microstructure in neat PC due to C-S–H seeds disrupts the stability of mutual construction between hydration products. The findings indicate that C-S–H seeds can be used in engineering to enhance concrete lifespan, reduce road repair expenses, and enhance construction efficiency.
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高影响因子
MONATSHEFTE FUR CHEMIE
·
2014
·Vol. 146
·期 3
·441-447
·
IF 1.347
Li Longfei,Chen Lin,Liu Weifeng,Yang Yongzhen,Liu Xuguang,Chen Yongkang
5-Fluorouracil surface-imprinted thermosensitive magnetic microspheres were prepared by using Fe 3 O 4 -encapsulating carbon microspheres as cores, N -isopropylacrylamide as thermosentitive monomer, ammonium persulfate as initiator, N , N ′-methylenebisacrylamide as crosslinker, and 5-fluorouracil as template molecule. The formation of these hybrid microspheres was verified by field emission scanning electron microscopy, transmission electron microscopy, Fourier transformation infrared spectroscopy, thermogravimetry, and dynamic light scattering. The results of the latter measurements show that the as-synthesized microspheres have a hydrodynamic diameter of 326 nm with the lower critical solution temperature of around 43 °C. The obtained microspheres are magnetic and show good potential for controlled loading and release of 5-fluorouracil. Graphical abstract
研究领域:
药剂学
·
纳米医学
·
肿瘤治疗
·
高分子材料科学
·
靶向给药系统
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高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Ying Xu,Dongling Wang,Bowen Luo,Xiaodong Zhang,Yuanbo Huang,Huanghuang Zhuang,Riyang Shu
An efficient hydrogenolysis for organosolv lignin was proposed by using Co/C coupled with NaOH catalyst in this work. A boosted aromatic monomer yield was achieved, which was superior to the noble metal-based catalysts. The optimal 15%Co/C catalyst coupled with NaOH exhibited the best hydrogenolysis performance, with lignin conversion of 94.5 % and aromatic monomers yield of 43.4 %. Wherein, the product of benzyl alcohols showed the highest yield 23.5 %. The recycling performance of 15%Co/C catalyst was outstanding, with lignin conversion above 92.8 % after three runs and the yield of aromatic monomer slightly dropped to 38 %. The hydrogenolysis reaction pathway was also investigated based on the β-O-4 dimer model compound study. 2-(2-methoxyphenoxy)-1-phenyl ethanol was selected as lignin β-O-4 dimer model compound, and the hydrogenolysis reaction was conducted efficiently at 160 °C under the synergistic catalysis effect of metal sites and base sites. NaOH promoted the initial depolymerization of lignin through protonation, which improved the accessibility of lignin product to Co/C catalyst, and thus enhanced the reactivity of catalytic hydrogenolysis. NaOH also facilitated the etherification of intermediate products with solvents. And the presence of Co metal site stabilized free radicals and inhibited monomer product etherification. This catalytic system provides a potential strategy for the large-scale lignin utilization, with the advantage of high efficiency and handleability.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 24
·42178-42185
·
IF 5.6
Hai Jiang,Qi-Feng Cai,Xiao-Hong Wang,Wen-Zhong Lu
Si 3 N 4 whiskers and nanocarbon powder were added to AlN–Y 2 O 3 –YF 3 ceramics, and the microstructure, thermal conductivity and flexural strength of the samples were studied. Instead of working as one-dimensional reinforcement in AlN ceramics, the Si 3 N 4 whiskers formed a β-Sialon phase that significantly strengthened the grain boundaries, thereby increasing the flexural strength of AlN sample. The added carbon powder formed a transition layer at the grain boundaries and further strengthened them. The fracture mode of the samples changed from intergranular to transgranular, and their flexural strength was increased. Moreover, carbon powder reduced the concentration of aluminum vacancy and improved the thermal conductivity of the samples. Therefore, the flexural strength and thermal conductivity of AlN ceramics with carbon powder and Si 3 N 4 whisker additives were synergistically increased to 366.4 ± 16.4 MPa and 203.5 ± 3.16 W m −1 K −1 , respectively.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Lvtong Duan,Jinkai Jia,Junchen Liu,Yijie Liu,Weimeng Chu,Jintang Zhou,Jiaqi Tao,Yi Yan,Weize Wang,Zhenyu Cheng,Yucheng Wang,Wenjian Zheng,Haiyan Zhuang,Tianjing Huang,Zhengjun Yao
The rapid growth of electronic devices has intensified electromagnetic wave pollution. Electromagnetic wave absorption (EWA) materials provide a green solution by converting electromagnetic energy into thermal energy. Achieving high-performance EWA requires a fine balance between impedance matching and energy dissipation, demanding precise control of microstructure, interfaces, and electronic states of the materials. However, complex multiscale structures involve strongly coupled structural evolution, which reduces controllability and hinders clear structure–performance correlation. Here, a cobalt-based metal–organic framework (Co-MOF) is employed as the precursor. By regulating the contents of Ni 2 + and Fe 3 + , the structural evolution and the modulation of localized electronic states during the etching process are systematically elucidated. In addition, the in situ competitive coordination and etching-competitive coordination systems reveal the mechanistic differences between atomic-scale induced reconstruction and directional destructive reconstruction. Benefiting from synergistic regulation spanning atomic, nanoscale, and microscale levels, the obtained FeNi/C composite achieves an effective absorption bandwidth of 7.13 GHz at an ultrathin thickness of 1.97 mm. Combining DFT, COMSOL, and CST simulations, the role of etching engineering in enhancing EWA performance is elucidated from electronic, local-field, and macroscopic perspectives, providing a theoretical basis for its controllable application and the rational design of high-performance absorbers.
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PubMed
高影响因子
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