RSC Advances
·
2015
·Vol. 5
·期 92
·75333-75340
·
IF 3.84
Qingqing Wang,Xiusheng Zhang,Yunlong Xu,Dong Liu,Hui Dong,Yang Zhang
A series of Ni and F ion doped LiMn2O4 composite cathode materials are synthesized via a sol–gel method with citric acid as the chelating agent. The morphology and structure of LiNixMn2−xO4−yFy were characterized by XRD, SEM, EDS and the electrochemical performance was tested and characterized by CV and EIS. The results showed that Ni and F ions were uniformly dispersed in the lattice without changing the structure and morphology of LiMn2O4. LiNi0.03Mn1.97O3.95F0.05 exhibits an excellent electrochemical performance among all the samples, and delivers an initial discharge capacity of 120.3 mA h g−1 at 1C and with a retention of 94.5% (25 °C) and 80.4% (55 °C) after the 100th cycle respectively. The results demonstrated that the dual-doping of Ni and F ions in lithium manganate can prevent the manganate from dissolving in the electrolyte and enhance the cycling performance at elevated temperatures, exhibiting excellent performance at different discharge rates.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 6
·1417
·
IF 3.1
Chen Zheng,Xu Han,Fangfang Sun,Yue Zhang,Zihang Huang,Tianyi Ma
Aqueous supercapacitors have occupied a significant position among various types of stationary energy storage equipment, while their widespread application is hindered by the relatively low energy density. Herein, N/F co-doped carbon materials activated by manganese clusters (NCM) are constructed by the straightforward experimental routine. Benefiting from the elevated conductivity structure at the microscopic level, the optimized NCM-0.5 electrodes exhibited a remarkable specific capacitance of 653 F g−1at 0.4 A g−1and exceptional cycling stability (97.39% capacity retention even after 40,000 cycles at the scanning rate of 100 mV s−1) in a neutral 5 M LiCl electrolyte. Moreover, we assembled an asymmetric device pairing with a VOxanode (NCM-0.5//VOx), which delivered a durable life span of 95% capacity retention over 30,000 cycles and an impressive energy density of 77.9 Wh kg−1. This study provides inspiration for transition metal element doping engineering in high-energy storage equipment.
研究领域:
材料科学
·
能源存储技术
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DOI
PubMed
高影响因子
CHEMISTRY & BIODIVERSITY
·
2024
·
IF 2.3
Yue Lu,Ming-Hua Duan,Xue Zhao,Yang Zhang,Yu Yang,Rui Xu,Ya-shuai Kang,Zi-Lin Wang,You-Zhi Zhang,Chang-Wei Li
Six previously unreported papulacandins, namely pestiorosins A–F (1–6), were isolated from the fermentation products of the fungus Pestalotiopsis rosea YNJ21 isolated from the fruitbody of Amanita exitialis. The structures of these compounds, along with a known compound called pestiocandin (7), were determined using MS, NMR data, and modified Mosher's method. All compounds exhibited significant antifungal activity against Candida albicans, with MIC values ranging from 0.06 to 2.00 μg/mL. In terms of cytotoxicity assays, compounds 3 and 6 demonstrated moderate inhibitory activity against human breast cancer MCF-7 cells with IC50 values of 24.50 and 16.83 μM, respectively. On the other hand, compound 7 displayed similar levels of inhibitory activity against mice microglial BV2 cells with an IC50 value of 24.51 μM.
研究领域:
微生物学
·
药物化学
·
天然产物研究
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Ying Zhang,Yue Wu,Tong Yan,Zhicheng Zhang,Wenxiang Zhang,Heping Ma
The development of efficient adsorbents for perfluorinated electronic specialty gases’ (F-gases) recovery presents significant challenges in the chip plasma etching process. In this study, we focus on preparing Ti- and W-replaced MFI zeolites, which offer abundant Lewis acid sites, to enhance the separation of F-gases toward N2. Through single-component gas adsorption and ideal adsorbed solution theory selectivity analyses, the Ti- and W-doped MFI zeolites demonstrate remarkable separation performance. Additionally, dynamic breakthrough experiments have confirmed the effective capture of F-gases using Ti- and W-doped MFI zeolites. The intrinsic adsorption mechanism was also investigated by the Grand Canonical Monte Carlo and independent gradient model (IGM) simulations. IGM results indicate that there is a strong charge transfer interaction between the polar Lewis acid sites in the MFI channel and F-gases with high polarizability. These results highlight the promising potential of MFI zeolites with abundant Lewis acid sites for addressing F-gas capture in the semiconductor industries.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 20
·14046-14054
·
IF 4.449
Qingxin Zeng,Tingting Yan,Kai Wang,Yinyan Gong,Yong Zhou,Yongli Huang,Chang Q. Sun,Bo Zou
In situ Raman spectroscopy revealed that transiting H2O/NaX (∼64) solutions into an ice VI phase and then into an ice VII phase at a temperature of 298 K requires excessive pressures with respect to pure water. The increase of the critical pressures varies with the solute type in the Hofmeister series order: X = I > Br > Cl > F ∼ 0. The results suggest that the solute hydration creates electric fields that lengthen and soften the O:H nonbond and meanwhile shorten and stiffen the H–O bond through O–O Coulomb repulsion. Compression, however, does the opposite to solute electrification upon the O:H–O bond relaxation. Therefore, compression of the aqueous solutions recovers the electrification-deformed O:H–O bond first and then proceeds to the phase transitions, which requires excessive energy for the same sequence of phase transitions. Ice exclusion of solute disperses the frequencies of characteristic phonons and the critical pressures with unlikely new bond formation.
研究领域:
物理化学
·
高压科学
·
材料科学
·
光谱学
·
水溶液物理
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DOI
高影响因子
Nuclear Materials and Energy
·
2021
·
IF 2.32
Ke Shi,Jian Yang,Qingsong Chen,Yongduo Sun,Wei Zhang,Kun He,Rui Tang,Zhien Ning,Jiali Liao,Yuanyou Yang,Ning Liu,Jijun Yang
The corrosion characteristics of 12Cr2W2Mn Ferritic/martensitic (F/M) steel before and after Au-ions irradiation in static lead–bismuth eutectic (LBE) have been investigated at 400 °C for 100 h. The results show that the samples without irradiation have many unequal size Fe 3 O 4 particles and little Cr-rich oxide after LBE corrosion test, and the thickness of corrosion layer is 4.4 μm. The irradiation samples display plenty compact triangular (Fe,Cr) 3 O 4 and some Cr-rich oxide, and the thickness of corrosion layer is 4.4 μm with some cracks. Au-ions irradiation enahnced the LBE corrosion of F/M steel, which could be attributed to the irradiation defects provide diffusion path of O atoms in liquid LBE. A schematic model was presented to understand the effect of irradiation damage on LBE corrosion behavior of F/M steel.
研究领域:
材料科学
·
核工程
·
腐蚀科学
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DOI
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2025
·
IF 3.7
Ruomu Chen,Yutian Gan,Wanting Huang,Chenyang Wang,Junhong Ge,Yuanyuan Cheng,Wenjing Qiao,Jiandong Jiang,Kai Chen
Bisphenol F (BPF) is an emerging environmental pollutant widely present in surface water and wastewater systems. Microbial activity is crucial in driving its degradation, offering a potential avenue for mitigating its environmental impact. Although the degradation pathway for BPF has been identified in various bacteria, the biodegradation mechanisms remain unclear. In this study, we isolated a highly efficient BPF-degrading strain of Sphingobium yanoikuyae DN12, which could utilize BPF as the sole carbon and energy source for growth, from a river sediment in Anhui Province, China. Through ultra-performance liquid chromatography high-resolution mass spectrometry (UPLC-HRMS) analysis, we found that oxidation and hydrolysis are key steps for BPF biodegradation. Utilizing whole-genome sequencing, comparative transcriptomics analysis, and biochemical identification, a gene cluster bpf was identified to be involved in BPF degradation. BpfAB is a two-component oxidoreductase responsible for converting BPF to 4,4'-dihydroxybenzophenone (DHBP). BpfC is a Baeyer–Villiger monooxygenase responsible for converting DHBP to 4-hydroxyphenyl-4-hydroxybenzoate (HPHB). Isotope tracing demonstrated that the oxygen atom incorporated by BpfAB originates from water, whereas that incorporated by BpfC derives from molecular oxygen (O2). BpfD is an α/β hydrolase responsible for converting HPHB to 4-hydroxybenzoate and 1,4-hydroquinone. Analysis of the taxonomic and habitat of 325 prokaryotic genomes revealed that BpfA-like homologs are predominantly found in the phylum Pseudomonadota, primarily inhabiting soil and aquatic environments. This study enhances our understanding of the biodegradation mechanism of BPF and provides guidance for the effective remediation of BPF-contaminated environments.
研究领域:
环境微生物学
·
生物修复
·
微生物代谢
·
环境科学
·
分子生物学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jiwen Hu,TingTing Liu,Hong-Wen Gao,Senlin Lu,Kajsa Uvdal,Zhangjun Hu
By ingeniously using a (imino)coumarin-precursor, three reactive fluorogenic probes of MP , FP, and FMP have been fabricated in a single facile synthetic route. MP and FP are able to respectively act as selective “turn-on” fluorescent probes for detecting Hg 2+ and F − in buffer solution via specific analyte-induced reactions. Linear ranges for the detection of Hg 2+ and F − are 0–10 μM and 0–100 μM with the limits of detection (LODs) of 4.0 × 10 −8 M and 1.14 × 10 −6 M (3δ/slope), respectively. FMP is able to work as a molecular “AND” logic gate-based fluorogenic probe for monitoring the coexistence of Hg 2+ and F − via a multistep reaction cascade. The analytes-induced sensing mechanisms have been determined by using high-performance liquid chromatography analysis (HPLC). In addition, three probes show negligible toxicity under the experimental conditions, and are successfully used for monitoring Hg 2+ and F − in living cells with good cell permeability. The success of the work demonstrates that ingenious utility of specific analyte-induced reactions and conventional concepts on the appropriate molecular scaffold can definitely deliver tailor-made probes for various intended sensing purposes.
研究领域:
分析化学
·
材料科学
·
生物化学
·
细胞生物学
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DOI
高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-8
·
IF 4.996
Wu Junsheng,Zhao Zhuo,Zhou Yanwen
Tin-based perovskite material is the best choice to replace heavy metal element lead during the last several years. Cs 2 SnI 6 with Sn 4+ is a fascinating optoelectronic material, which is a more air-stable composite cesium tin halide peroxide variant from CsSnI 3 . However, the optoelectronic performance between N and P type of Cs 2 SnI 6 varies considerably. Herein, we synthesized uniform Cs 2 SnI 6 by modified two-step method, which thermal evaporated CsI firstly, and followed annealing in the SnI 4 and I 2 vapor at 150 °C resulted in uniform Cs 2 SnI 6 films. SnF 4 is used as a dopant source to improve the optoelectronic properties of Cs 2 SnI 6 films. Results indicate that good crystallinity was obtained for all films and the doped films underwent a crystalline plane meritocracy transition. The doped films had a flat, non-porous morphology with large grains. The high transmittance of the doped films in the infrared region led to the avoidance of self-generated thermal decomposition. With the help of F − , the films became more conductive and had higher carrier mobility. DFT calculations showed that doping with F reduced the surface energy of (004), resulted in a preferred orientation transition in the crystal of Cs 2 SnI 6 . Fluorine doped double layer perovskite materials would have a broader application prospect.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Zhen Zhao,Yunlong Xu,Mandi Ji,Huang Zhang
F-doped Li 4 Ti 5 O 12 anode materials in the form of Li 4 Ti 5 O 12− x F x (0 ≤ x ≤ 0.5) are synthesized successfully via a solid-state reaction. The structure and electrochemical properties of the as-prepared powders are investigated. The Li 4 Ti 5 O 12− x F x ( x = 0.3) sample exhibits an outstanding electrochemical performance among all the samples in a potential range from 0.01 to 2.5 V, and delivers higher discharge capacity and better long-term cycling stability compared with the pristine Li 4 Ti 5 O 12 . The initial specific discharge capacity is 234.5 mAh g −1 at a density of 85 mA g −1 , and remains about 138 mAh g −1 over 500 cycles when the current density increases to 340 mA g −1 . The excellent electrochemical performance could be attributed to the substitution of F − into O 2− site, which can increase the amount of Ti 3+ /Ti 4+ mixing as charge compensation, leading to the decrease of the charge transfer resistance and improvement of the lithium ion diffusion in Li 4 Ti 5 O 12− x F x .
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2013
·
IF 2.04
Lingyun Dong,Shilie Pan,Hongping Wu,Xin Su,Hongwei Yu,Ying Wang,Zhaohui Chen,Zhenjun Huang,Zhihua Yang
A series of lead-containing halogen oxyborates, Pb 6 B 3 O 10 X ( X =F, Cl, Br), have been grown by high-temperature solution method and their crystal structures were determined by single-crystal X-ray diffraction. They are isostructural and crystallize in the space group Pbcm of the orthorhombic crystal system . The crystal structures are dominated by one-dimensional ∞ [(Pb 4 O)(BO 3 ) 3 ] “ Zig-Zag ”-chains, while the remaining Pb atoms and X ( X =F, Cl, Br) atoms are filled to balance the charge. Compared with the previously reported compound Pb 4 O(BO 3 ) 2 (the molecular formula Pb 4 O(BO 3 ) 2 can be regarded as Pb 6 B 3 O 10.5 ) with the space group Aba 2, the structures of Pb 6 B 3 O 10 X ( X =F, Cl, Br) are completely different from that of Pb 4 O(BO 3 ) 2 . IR spectroscopy , UV–vis-NIR diffuse reflectance spectroscopy , thermal analysis, and theoretical calculations were also performed on the reported materials.
研究领域:
材料科学
·
晶体学
·
光学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qi Wang,Baker Rhimi,Hui Wang,Chuanyi Wang
To solve the aggregation problem of TiO 2 nanomaterials and improve the catalytic efficiency, F-doped TiO 2 /exfoliated bentonite (TF/EB) composite was prepared by dispersing F-doped TiO 2 (TF) nanoparticles on an exfoliated bentonite (EB) using a facile sol–gel method. The exfoliated bentonite was prepared by liquid-exfoliation method from the natural bentonite (B). The prepared samples were applied for toluene degradation in gas phase under UV and visible light irradiation. The as-prepared TF/EB composite exhibited higher toluene degradation efficiency than that of pure TiO 2 , F-doped TiO 2 and TF/B composite. Results indicated that the calcination temperature and the initial F/Ti atom ratio of reaction precursors greatly affected the photocatalytic activity towards toluene degradation. The best photocatalytic performance was obtained by the sample calcinated at 400 °C with an initial F/Ti atom ratio of 5%. The improved photocatalytic performance is ascribed to a series of benefits introduced by F-doping and exfoliation process. The presence of F - ions increases the percentage of exposed reactive {0 0 1} facets on TiO 2 . Moreover, F - ions incorporated into the TiO 2 lattice generate oxygen vacancies and Ti 3+ defects, which influence the transfer and migration of the photoinduced charge carriers and induce a visible-light photocatalytic activity . Furthermore, the electrostatic interaction of negatively charged exfoliated bentonite surface leads to a more efficient separation of charge carriers.
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高影响因子
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