MATERIALS LETTERS
·
2018
·
IF 2.687
Xi Cao,Yang Yang
NASICON-structured NaTi 2 (PO 4 ) 3 is regarded as the most suitable anode for aqueous sodium ion batteries, however, the low electronic conductivity intrinsically restricts its application. NaTi 2 (PO 4 ) 3 -carbon composite is prepared by a facile solid state sintering method and studied as the anode in aqueous sodium ion battery , coupling with activated carbon as the cathode. This neutral sodium ion battery shows a high output voltage of 1.17 V, with outstanding rate and cycling stability. The full cell delivers an energy density of 33.4 Wh∙kg −1 at a power density of 33.4 W∙kg −1 based on the total active mass of the anode and cathode materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yang Gao,Weishuang Fang,Tianyi Xie,Haiyi Peng,Xiaogang Yao,Huixing Lin
Mg 1–3 x (CoNiZn) x Ta 2 O 6 ceramics ( x = 0.00, 0.05, 0.10, 0.20, and 0.25) were synthesized by the solid-phase reaction method. The XRD and Rietveld refinement results suggest that the Mg 1–3 x (CoNiZn) x Ta 2 O 6 ceramics have a pure tri-rutile structure. (Co 1/3 Ni 1/3 Zn 1/3 ) 2+ can significantly broaden the sintering temperature range of ceramics. The chemical bonding theory reveals that the A-O bond (A = Mg, Co, Ni, or Zn) ionicity and Ta-O bond ionicity are closely related to the porosity corrected relative permittivity ( ε r -corr. ). The increase in A-O bond energy contributes to the greater stability of the AO 6 octahedron , resulting in a decrease in | τ f |. Additionally, the Raman spectroscopy reveals that there is a negative relationship between the Qf value and the full width at half maximum ( FWHM ) of the strongest peak of the A 1g mode. Correspondingly, Mg 0.4 (CoNiZn) 0.2 Ta 2 O 6 ceramic has excellent microwave dielectric properties after sintering at 1450°C for 4 h: ε r = 28.9, Qf = 91,900 GHz (at 7.4 GHz), and τ f = 44 ppm/°C. Furthermore, Mg 0.4 (CoNiZn) 0.2 Ta 2 O 6 ceramic can maintain a stable Qf value (∼ 91,000 GHz) across a broad range of sintering temperatures (150°C), which is a result of the combination of densification and FWHM . This characteristic facilitates adaptation to changes in furnace temperature in large-scale production. The strategy of multiple-element substitution to extend the sintering temperature range is expected to be applied to other ceramic systems.
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ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202404259
·
IF 1.9
Jiangwei Tao,Yixiao Qiu,Guangsu Tan,Shaoyu Yang,Wenda Li,Weiwei Wang,Yuzhu Wang,Chao Xu
Graphical This work provides in-depth investigation into the electrochemical and structural properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising high-capacity anionic redox cathode material for sodium-ion batteries. Our findings also indicate that enhanced cycling stability and suppressed impedance increases can be achieved through optimized upper and lower cutoff voltages. Activating anionic redox is an effective strategy for enhancing the capacity of cathode materials in both lithium-ion and sodium-ion batteries. However, the fundamental mechanisms of O3-type sodium anionic redox cathodes remain poorly understood due to the limited availability of such materials, despite their inherent advantages such as high initial sodium content and high reversible capacity. Herein, we employ multiple characterization methods to elucidate the structural and electrochemical properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising sodium anionic redox cathode developed recently, with a particular focus on the effect of cutoff voltages during electrochemical aging. Our synchrotron powder X-ray diffraction results indicate that charging the material to voltages above 4.1 V induces substantial structural changes, which compromise the structural and electrochemical reversibility of the material. This is corroborated by more rapid capacity decay and increased impedance, attributed to severe degradation on both the surface and in the bulk, as evidenced by the formation of lower valence manganese compounds. Furthermore, increasing the lower cutoff voltage for the discharge process effectively suppresses surface degradation, thereby improving cycling stability. This work offers a comprehensive understanding of a pivotal sodium anionic redox cathode material, providing valuable insights that can drive the development of advanced materials for sodium-ion batteries.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhuang-Hao Zheng,Ning Chen,Zi-Long Zhang,Jun-Ze Zhang,Dong Yang,Mohammad Nisar,Mazhar Hussain Danish,Fu Li,Shuo Chen,Jing-Ting Luo,Guang-Xing Liang,Yue-Xing Chen
Flexible thermoelectric (TE) generators have received great attention as a sustainable and reliable option to convert heat from the human body and other ambient sources into electricity. This study provides a synthesis route that involves thermally induced diffusion to introduce Te and Se into Bi, fabricating an n-type Bi–Te–Se flexible thin film on a flexible substrate. This specific synthesis alters the crystal orientation (00l) of the thin film, improving in-plane electrical transportation and optimizing carrier concentration. Consequently, BixTeySe0.42 enhanced both the Seebeck coefficient and electrical conductivity, achieving a power factor of 17.1 μW cm–1 K–2 at room temperature. The TE device assembled with p-type Sb2Te3 exhibited exceptional flexibility with only a 26.2% change in resistance after 1000 times of bending at a radius of about 6 mm. The resistance change was further reduced to 7.5% after the application of a vinyl laurate coating. The fabricated TE device generated an ultrahigh output power of 792 nW with a temperature difference of 30 K.
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BIOLOGICAL CONTROL
·
2019
·
IF 2.607
Xiaoyu Zhang,Zhenfeng Gao,Xinxian Zhang,Wenbin Bai,Lixin Zhang,Hongbin Pei,Yongjie Zhang
Post-harvest diseases of raspberries affect their storage and subsequently the ability to provide consumers with fresh products. The antifungal activity of microbial volatile organic compounds (MVOCs) against both pre and postharvest diseases has previously been demonstrated, but the control of raspberry postharvest diseases caused by Botrytis cinerea and Rhizopus stolonifer using MVOCs has not been extensively studied. We have thus investigated the effects of Bacillus siamensis G-3 volatile organic compounds (VOCs) on controlling the diseases caused by B. cinerea and R. stolonifer . Bioassays of the VOCs of B. siamensis G-3 exhibited significant control effects (89.4%) on the two pathogens. The VOCs composition was studied with solid phase micro extraction and GC/mass spectrometry (SPME-GC-MS), and 22 VOCs, different from the controls, were identified. Among these compounds, only 2, 6-di- tert -butyl-4-methylphenol (BHT), and 2,4-di- tert -butylphenol (2,4-DTBP) had significant control effects on the pathogens (* P < 0.05), 52.38 and 93.33%, respectively, compared with the controls in vivo . With the 2,4-DTBP treatments, the raspberries could be stored for 20 d at 0 °C, with the disease rate maintained at ∼10%. In addition, we have reported for the first time, that 2,4-DTBP may be a better preservative than BHT and could be used as a bio-fumigant for controlling raspberry postharvest diseases caused by B. cinerea and R. stolonifer in vivo .
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高影响因子
LETTERS IN APPLIED MICROBIOLOGY
·
2014
·Vol. 59
·期 3
·306-312
·
IF 1.749
Meng F.,Ma L.,Ji S.,Yang W.,Cao B.
Bioconversion of biomass, particularly crop wastes, into biofuels is being developed as an alternative approach in meeting the high energy demand. In this study, a thermophilic bacterial strain BY‐3 that exhibits cellulolytic potential was isolated from faecal samples of Tibetan pigs; this strain was identified as Bacillus subtilis. The strain can produce cellulase when grown on various substrates, including carboxymethyl cellulose, rice straw, corn stover, soluble starch and wheat bran. The maximum cellulase activity of the strain was up to 4·323 ± 0·065 U ml−1 when cultivated in the medium containing corn stover (30 g l−1) for 24 h. The results demonstrated that corn stover is the most suitable substrate for cellulase production by the strain BY‐3. The crude cellulase of strain BY‐3 was most active at pH 5·5 and 60°C, and the enzyme in acetate buffer (50 mmol l−1) demonstrated a good stability at 60°C for at least 1 h. The crude cellulase exhibited a strong antibacterial activity against Staphylococcus aureus. The strain can be used in cost‐efficient cellulase production for bioconversion of agricultural residual biomass into biofuels.Significance and Impact of the StudyThe increased consumption of fossil fuels has caused serious energy crisis and environmental problem. Thus, an alternative energy source is necessary. Bioconversion of biomass, particularly agricultural residuals, into value‐added bioproducts, such as biofuels and chemical solvents, has received considerable attention. In this study, the newly isolated thermophilic Bacillus subtilis strain BY‐3 produces cellulase efficiently with the use of untreated corn stover as a sole carbon source. This strain possesses the thermostable cellulase that is active with diverse crop wastes with a broad pH range and is a highly promising candidate for agricultural waste management.
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JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Shirui Zhang,Dan Zhao,Shaojie Dai,Hongli Lou,Ruijuan Zhang
Langbeinite type compounds are a large kind of oxometallate with good flexibility structure. Herein, we synthesized a new langbeinite type compound K 2 Dy 1.5 Ta 0.5 (PO 4 ) 3 , in which the Dy 3+ and Ta 5+ were blended to occupy the same crystallographic sites. Simultaneously, solid solutions of K 2 Dy 1.5– x Eu x Ta 0.5 (PO 4 ) 3 ( x = 0–1.5) were prepared and their photoluminescence properties were investigated. Due to energy transfer from Dy 3+ to Eu 3+ , both Dy 3+ and Eu 3+ characteristic emissions are observed under 393 nm light excitation . The emitting color of K 2 Dy 1.5– x Eu x Ta 0.5 (PO 4 ) 3 turns from green through yellow to red by simply adjusting the Eu 3+ concentration from 0 to 0.4. Moreover, K 2 Dy 1.48 Eu 0.02 Ta 0.5 (PO 4 ) 3 phosphor possesses excellent fluorescence thermal stability and exhibits zero thermal quenching at 150 °C. These results manifest that K 2 Dy 1.5– x Eu x Ta 0.5 (PO 4 ) 3 solutions are promising multi-color emitting phosphors candidate for near-UV LED.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yonghang Mu,Zi Wang,Linhua Song,Kun Ma,Yao Chen,Peixun Li,Zifeng Yan
Sphingosine, an amphiphilic molecule, plays a pivotal role as the core structure of sphingolipids, essential constituents of cell membranes. Its unique capability to enhance the permeability of lipid membranes profoundly influences crucial life processes. The molecular structure of sphingosine dictates its mode of entry into lipid bilayers and governs its interactions with lipids, thereby determining membrane permeability. However, the incomplete elucidation of the relationship between the molecular structure of sphingosine and the permeability of lipid membranes persists due to challenges associated with synthesizing sphingosine molecules. A series of sphingosine-derived molecules, featuring diverse hydrophobic chain lengths and distinct headgroup structure, were meticulously designed and successfully synthesized. These molecules were employed to investigate the permeability of large unilamellar vesicles, functioning as model lipid bilayers. With a decrease in the hydrophobic chain length of sphingosine from C15 to C11, the transient leakage ratio of vesicle contents escalated from ∼ 13 % to ∼ 28 %. Although the presence of double bond did not exert a pronounced influence on transient leakage, it significantly affected the continuous leakage ratio. Conversely, modifying the chirality of the C-3 hydroxyl group gives the opposite result. Notably, methylation at the C-3 hydroxyl significantly elevates transient leakage while suppressing the continuous leakage ratio. Additionally, sphingosines that significantly affect vesicle permeability tend to have a more pronounced impact on cell viability. Throughout this leakage process, the charge state of sphingosine-derived molecule aggregates in the solution emerged as a pivotal factor influencing vesicle permeability. Fluorescence lifetime experiments further revealed discernible variations in the effect of sphingosine molecular structure on the mobility of hydrophobic regions within lipid bilayers. These observed distinctions emphasize the impact of molecular structure on intermolecular interactions, extending to the microscopic architecture of membranes, and underscore the significance of subtle alterations in molecular structure and their associated aggregation behaviors in governing membrane permeability.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Shijie Gu,Yingyue Cui,Kaihua Wen,Shimou Chen,Jianling Zhao
Layered lithium/manganese-rich oxides (LMR) receive much attention due to its high specific capacity (∼300 mAh g -1 ). However, the serious capacity degradation during cycling hinders the commercial application of the LMR. Herein, 3-cyano-5-fluorophenylboronic acid (CFBA) was applied as an electrolyte additive for enhancing the cycling stability of LMR at high voltage. Linear sweep voltammetry (LSV), density function theory (DFT) calculations and the initial charge d Q /d V profiles indicate that the preferential oxidation of CFBA can improve the oxidative stability of electrolyte. By adding 0.7 wt% CFBA into standard (STD) electrolyte (1 M LiPF 6 in EC :EMC:DMC = 1:1:1, by weight), the LMR/Li half-cell delivered a discharge capacity of 245 mAh g -1 with a capacity retention of 88.4% after 200 cycles at 0.5C, while only 68 mAh g -1 with 25.2% retention in STD electrolyte. Further characterizations and theoretical calculation illustrate that CFBA can effectively eliminate the harmful HF, which improve the electrochemical performance . More importantly, the CFBA participates in the formation of a thin and uniform protective cathode-electrolyte interface (CEI) film on the surface of LMR, which effectively suppresses electrolyte decomposition and protects the structural integrity of LMR.
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高影响因子
NATURAL PRODUCT RESEARCH
·
2022
·
IF 2.488
Ruolan Chen,Ziyang Li,Chan Qin,Peijun Lu,Jiaru Lin,Wenxu Zheng,Yahong Xiong,Chunyuan Li
A novel tyroscherin derivative named pseudallecin A (1) with a natural unprecedented morpholine-2, 3-dione structural unit, and a new biogenic synthesis related organic acid named pseudallecin B (2) were purified from a symbiotic fungus Pseudallescheria boydii derived from Pomacea canaliculata. Their structures were elucidated via spectroscopic analyses and ECD calculation. Pseudallecin A exhibited strong inhibitory activities against both Gram-positive Escherichia coli and Gram-negative Staphylococcus aureus.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Hui Xiao,Xiaobing Huang,Yurong Ren,Haiyan Wang,Jianning Ding,Shibiao Zhou,Xiang Ding,Yuandao Chen
Na 3 V 2 (PO 4 ) 3 /nitrogen doped carbon (NVP/CN) composites have been fabricated by a simple and low cost solid-state technique using folic acid as the carbon-nitrogen source. The structure, morphology and electrochemical performance of NVP/CN composites coated with various carbon-nitrogen layer contents are well investigated. The results reveal that the NVP/CN composite with 3.3 wt% carbon-nitrogen exhibits the largest specific surface area, with a uniform carbon-nitrogen layer thickness of approximately 2 nm. When tested as cathode material for sodium ion battery , NVP/CN composite with 3.3 wt% carbon-nitrogen displays an outstanding high rate properties with the discharge capacity of 95 and 91 mAh g −1 at 10 and 20 C, respectively, and long cycle life up to 3000 times even at a high rate of 10 C due to the smallest charge-transfer resistance and highest Na + diffusion coefficient . The results suggest that folic acid is a promising carbon-nitrogen source for construction of NVP/CN and other cathode materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Y.K. Yang,F.L. Liu,Y.W. Zhang,M.F. Li,F. Ling,H.T. Wu
In this work, ultra-low loss Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 ceramics were successfully prepared via the conventional solid-state method. X-ray photoelectron spectroscopy (XPS), thermally stimulated depolarization current (TSDC) and bond energy were used to determine the distinction between intrinsic and extrinsic dielectric loss in (Mg 1/3 Nb 2/3 ) 4+ ions substituted ceramics. The addition of (Mg 1/3 Nb 2/3 ) 4+ ions enhances the bond energy in unit cell without changing the crystal structure of Li 2 MgTiO 4 , which results in high Q·f value as an intrinsic factor. The extrinsic factors such as porosity and grain size influence the dielectric loss at lower sintering temperature , while the oxygen vacancies play dominant role when the ceramics densified at 1400 °C. The Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 ceramics sintered at 1400 °C can achieve an excellent combination of microwave dielectric properties : ε r = 16.19, Q·f = 160,000 GHz and τ f = −3.14 ppm/°C. In addition, a certain amount of LiF can effectively lower the sintering temperature of the matrix, and the Li 2 MgTi 0.7 (Mg 1/3 Nb 2/3 ) 0.3 O 4 -3 wt% LiF ceramics sintered at 1100 °C possess balanced properties with ε r = 16.32, Q·f = 145,384 GHz and τ f = −16.33 ppm/°C.
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