RARE METALS
·
2021
·Vol. 40
·期 10
·2810-2818
·
IF 4.003
Xu Kun,Liang Xin,Wang Lu-Lu,Wang Yong,Yun Ju-Feng,Sun Yi,Xiang Hong-Fa
Abstract The popularity of lithium–sulfur batteries has been increasing gradually due to their ultrahigh theoretical specific capacity and energy density. Nevertheless, they also have lots of drawbacks to be overcome, such as poor conductivity, severe volume expansion, and serious “shuttle effect”. In this work, reduced graphene oxide/molybdenum dioxide (rGO/MoO 2 ) composite is synthesized and applied to modify polypropylene separator. The modified polypropylene separator introduces synergistic tri-functions of physical adsorption, chemical interaction and catalytic effects, which can inhibit the “shuttle effect” and enhance the electrochemical performances of lithium-sulfur batteries. In the prepared rGO/MoO 2 composite, the polar MoO 2 chemically adsorbs the intermediate lithium polysulfide, while the rGO with good electrical conductivity not only acts as a physical barrier to prevent diffusion of polysulfide ions, but also improves the conversion efficiency of active material intercepted on the separator. As a consequence, the battery assembled with rGO/MoO 2 modified polypropylene separator exhibits a reversible capacity of 757.5 mAh·g −1 after 200 cycles at 0.2C with a negligible capacity decay of 0.207% per cycle, which indicates a good long-period cycling stability. Furthermore, the rate performance and self-discharge suppression are also improved by introducing modified polypropylene separator. It shows that rGO/MoO 2 composite is a promising material for separator modification in lithium-sulfur batteries. Graphic abstract
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 15
·6637-6647
·
IF 3.553
Lin Qing,Dong Xiaoli,Wang Yu,Zheng Nan,Zhao Yilin,Xu Wenwen,Ding Tao
Layered transition metal dichalcogenides especially MoS 2 is favorable to be the low-cost alternative to Pt-based electrocatalysts for water splitting. Defect-rich MoS 2 nanosheets exhibiting enlarged interlayer spacing of 9.2 Å were synthesized via a solvothermal method, in which trithiocyanuric acid (TTCA) was used as a sulfur source. In addition, we synthesized MoS 2 with L -cysteine for comparison. To improve the conductivity and quantity of active exposed sites of MoS 2 nanosheets, the rGO nanosheets were introduced to hybridize with MoS 2 . With the addition of rGO, the MoS 2 /rGO hybrids exhibit different morphologies and larger interlayer spacing of 9.5 Å. Furthermore, the enhanced performance for hydrogen evolution reaction is attributed to the synergistic effect between the MoS 2 nanosheets and rGO substrates. MoS 2 /rGO-2 possesses an onset overpotential of 118 mV, a small Tafel slope of 51 mV/dec, high double-layer capacitance ( C dl ) of 15.27 mF/cm 2 , and superior cycling stability over 1000 cycles in acidic conditions.
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高影响因子
ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 3
·571-582
·
IF 1.967
Song Lin,Yin Xiaodie,Zhu Leijing,Huang Zhuomin,Ma Jing,Xu Ajing,Gu Yingying,An Yarui,Miao Yuqing
A label-free electrochemical immunosensor based on the biscuit-like bismuth nanosheets (BiNSs) and multi-wall carbon nanotubes–chitosan-gold nanoparticles (MWCNTs–Chit-AuNPs) was constructed for the detection of human immunoglobulin G (hIgG). The biscuit-like BiNSs prepared by one-step aqueous phase reduction method had a large electroactive surface area, 1.7 times that of bare glassy carbon electrode (GCE), which could load more antibodies and were used as a larger platform for the specific identification of antigens and antibodies. In addition, MWCNTs and AuNPs with good conductivity could be used to regulate the sensing interface, which promoted electron transfer greatly. Moreover, the AuNPs could stably anchor anti-hIgG by the affinity interaction between amine group of antibody and AuNPs, which greatly increased the number of anti-hIgG attached to the sensing platform. Under the optimal conditions, the proposed immunosensor exhibited excellent analytical performance for hIgG with a wide linear response of 0.01–1000 ng/mL and a low detection limit of 4.26 pg/mL. The electrochemical immunosensor exhibited favorable reproducibility, excellent specificity and high storage stability. Additionally, the immunosensor could be applied to determining hIgG in human serum samples as well. Considering these advantages, the electrochemical immunosensor has the potential application in clinical diagnosis. Graphical abstract
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高影响因子
MRS Advances
·
2022
·Vol. 7
·期 30
·736-740
·
IF 0
Guo Yong,Tan Junlang,Zhao Jingchang
In this work, (La, Eu) co-doped CaCu 3 Ti 4 O 12 ceramics (Ca 1− x La x Cu 3 Ti 4− x Eu x O 12 (CLCTEO)), x = 0.1, 0.3, and 0.5) were prepared by the solid-state method. The phase structure, morphologies, dielectric properties, and impedance spectrum were investigated methodically. The XRD of CLCTEO ceramics confirmed the formation of the complex perovskite with a residual amount of CaTiO 3 . The refined calculation found that the lattice parameter of CLCTEO ceramics will significantly increase due to the co-doping of La and Eu. The FESEM analysis shows that the grain size of co-doped CCTO is smaller, reaching the nanometer scale. Impedance indicates that the (La, Eu) co-doped CCTO ceramics have higher dielectric permittivity than the single-doped with La or Eu. The results show that co-doping is an effective method to improve the dielectric properties of CCTO ceramics. Graphical abstract
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BMC PLANT BIOLOGY
·
2022
·Vol. 22
·期 1
·1-15
·
IF 5.26
Wang Haitang,Zhou Xuesong,Liu Chuchu,Li Weixi,Guo Wangzhen
Background In eudicots, germination begins with water uptake by the quiescent dry seed and is greatly related to the permeability of micropyle enriched callose layers. Once imbibition starts, seeds undergo a cascade of physiological, biochemical, and molecular events to initiate cellular activities. However, the effects of callose on water uptake and following seed metabolic events during germination are largely unknown. Cotton ( Gossypium hirsutum ) is a eudicot plant with natural fiber and edible oil production for humans. Here, we addressed this question by examining the role of GhGLU19 , a gene encoding β-1,3-glucanase, in cotton seed germination. Results GhGLU19 belongs to subfamily B and was expressed predominately in imbibed seeds and early seedlings. Compared to wild type, GhGLU19 -suppressing and GhGLU19 -overexpressing transgenic cotton lines showed the higher and lower seed germination percentage, respectively. Callose was enriched more at inner integument (ii) than that in embryo and seed coat in cotton seeds. In GhGLU19 -suppressing lines, callose at ii of cotton seeds was greatly increased and brought about a prolonged water uptake process during imbibition. Both proteomic and transcriptomic analysis revealed that contrary to GhGLU19 -overexpressing lines, the glycolysis and pyruvate metabolism was decreased, and abscisic acid (ABA) biosynthesis related genes were downregulated in imbibed seeds of GhGLU19 -suppressing lines. Also, endogenous ABA was significantly decreased in GhGLU19 -suppressing line while increased in GhGLU19 -overexpressing line. Conclusions Our results demonstrate that suppression of GhGLU19 improves cotton seed germination via accumulating callose of inner integument, modulating glycolysis and pyruvate metabolism, and decreasing ABA biosynthesis. This study provides a potential way for improving germination percentage in cotton seed production, and other eudicot crops.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6760-6767
·
IF 2.195
Bao Runxi,Li Mingyu,Shen Meng,Liu Huan,Zhang Guangzu,Zeng Yike,Jiang Shenglin
Ceramic-polymer pyroelectric composite materials with favorable flexibility hold great potential for wearable sensors and energy harvesters, and the further improvement in pyroelectric properties would push them closer to practical application. In this work, an uniaxial stretching method was proposed to optimize the performance of lead zirconate titanate nanowires (PZT NWs)/polyvinylidene fluoride (PVDF) 1–3 composites. With just one stretching treatment, the pyroelectric coefficient of the composite was enhanced by inducing more β phase in PVDF matrix, and the permittivity was decreased by reorientation of PZT NWs to the strain direction in the meantime. As a result of the incorporated effects, the figure of merit of the stretched composite with orientated PZT NWs increases to the value of 2.18 × 10 −10 C cm −2 K −1 , which is 619% higher than that of untreated samples at 35 °C. This work could provide an efficient approach to fabricate high-performance ceramic-polymer pyroelectric composite materials.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 5
·1266-1281
·
IF 2.7
Zhou F. Y.,Xu J. C.,Hong B.,Peng X. L.,Zeng Y. X.,Li J.,Ge H. L.,Wang X. Q.
Mesoporous SnO 2 nanospheres are synthesized by template-free solvothermal method, and then reduced graphene oxide (rGO) nanosheets are anchored on SnO 2 nanospheres (SnO 2 @rGO nanocomposites) by hydrothermal method. The gas-sensing results indicate that rGO nanosheets greatly affect the formaldehyde (HCHO) gas-sensing properties, which the response to 100 ppm HCHO gas increases with the rGO content and reach the maximum of 113.56 at 190 °C for SnO 2 @0.5%rGO sensor. Owing to the huge surface area and conductivity, rGO nanosheets absorb more oxygen molecules and extract electrons from SnO 2 nanospheres, leading to the thicker electron depletion layer of SnO 2 nanospheres. Furthermore, p-n heterojunctions at the interface of rGO nanosheets and SnO 2 nanospheres further increase the thickness of electron depletion layer. However, SnO 2 @0.8%rGO sensor presents the lower response for the new conductive pathways between the surface rGO nanosheets due to the excess of rGO content.
Graphical abstract
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高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 12
·期 1
·41-49
·
IF 2.786
Lan Zhou,Lu Yangcheng
Benzyl iodide, an important organic synthesis intermediate, has high reaction activity as well as high commercial value due to its weakest carbon-halogen bond. However, the development of direct iodination of toluene for benzyl iodide is limited by the fact that the C-I bond is easily decomposed under heat or light. In this work, the photoiodination of toluene to synthesize benzyl iodide in the I 2 /PhI(OAc) 2 / t BuOH system was carefully investigated in the flow photoreactor under LEDs irradiation. The reaction window suitable for the reaction kinetic characteristics recognition was revealed with the considerations of the effects of various parameters including light color, light intensity, reaction temperature, residence time, and usage of each substrate. And an optimized result is to achieve 95.83 % of yield and over 99 % of selectivity under a red light with 2.05 mW/cm 2 of light intensity at 80 o C after 15 min reaction. The reaction kinetic model coupling the iodination reaction (photo and thermal reaction) with the decomposition reaction is established, which fits well the experimental results and provides fundamentals for process design and optimization. Graphical abstract
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 1
·575-581
·
IF 1.137
Cai Fei,Yan Heng,Fan Wenbin,Li Shihong,Xu Jianfeng,Wang Zheng,Tang Xiaobin
A mild HPLC method for the quality control of [ 18 F]sodium fluoride solution for injection was developed. The method used anion exchange column for separation, UV and online radio-detectors for fluoride content and fluorine-18 determination. A mixture of 100 mM sodium acetate and 25 mM sodium chloride was chosen as mobile phase. The method was validated for system suitability, specificity, fluoride concentration and radiochemical purity determination with good linearity, accuracy and precision. The good robustness of the system was also verified, enabling routine analysis of fluoride content and radiochemical purity of the [ 18 F]sodium fluoride product.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19477-19486
·
IF 2.195
Xu Chen,Feng Yan,Mao Zemin,Zhou Yingjie,Liu Li,Cheng Weihao,Wang Jinpei,Shi Hao,Liu Xiang
Metal–organic frameworks as electrode materials have attracted significant attention due to their high specific surface area and flexible structures. Compared with the metal–organic frameworks derived products, the direct applications of metal–organic frameworks as electrode materials are rather seldom because of their insufficient conductivity. Herein, binary nickel–cobalt based metal–organic frameworks are developed as electrode materials for supercapacitor. The binary metal based metal–organic frameworks behave better electrochemical performance than the sole metal base metal–organic frameworks, and this is majorly due to the synergistic effect between the binary metals. The highest capacitances of 978.9 F g −1 at 1 A g −1 at a nickel/cobalt ratio of 2:4 can be obtained. Meanwhile, the nickel–cobalt metal–organic framework presents excellent stability even after being run for 3000 cycles. The Ni–Co-2-4-MOF//AC asymmetric capacitor shows a high energy density of 14.77 Wh kg −1 and power density of 8477 W kg −1 . These results show that Ni–Co-MOFs have a promising applications in supercapacitor electrode.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 13
·16754-16766
·
IF 4.223
Liu Si-Yu,Yu Wen-Jing,Wang Yi-Ru,Shao Xue-Ting,Wang De-Gao
Illicit drug use has long been a key issue of international concern, and the true situation is unknown to the relevant authorities. To develop a profile of comprehensive consumption patterns of illicit drugs in China, data from 34 wastewater treatment plants in 25 cities were collected to analyze four classes of drugs, including amphetamine-type stimulants, opioids, ketamine, and cocaine. They were identified and quantified in samples using methods based on gas chromatography coupled to mass spectrometry. According to the wastewater-based epidemiology (WBE) approach, an analysis of the consumption pattern was performed regarding per inhabitant consumption based on the revised metabolic rate. The consumption quantity of illicit drug and precursor was divided into four categories based on statistical difference analyses: methamphetamine and ephedrine (precursor) were the predominant drugs in the first category, followed by ketamine and heroin in the second category, methcathinone and 3,4-methylenedioxymethamphetamine (MDMA) in the third category, and cocaine and methadone in the fourth category. There were distinctive spatial patterns: heroin and cocaine consumption was higher in Southern China than in Northern China, heroin consumption was higher in Western China than in Eastern China, and the consumption of each drug differed across seven regions of China, especially with ephedrine and methcathinone consumption higher in North China; heroin consumption higher in Southwest, Central, and Northwest China; and ketamine and MDMA consumption higher in East, South, and Central China. Compared with findings in previous studies, there were temporal patterns, in which ketamine consumption presented a downward trend but heroin remained stable. Based on correlation analyses, there were the polydrug abuse patterns between heroin and cocaine, methcathinone and ketamine, and cocaine and MDMA. In general, this study based on WBE provides a comprehensive evaluation of drug consumption in China. Graphical abstract
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 103
·期 3
·1475-1483
·
IF 3.67
Liu Zihui,Xue Aifang,Chen Hao,Li Shengqing
Time-resolved inductively coupled plasma mass spectrometry (ICP-MS) for studying cellular heterogeneity or detecting metals in single cells draws increasing attention in the recent years. Considering the full width of a single-cell event is about 0.5–0.9 ms, dependent on the duration of the ion plume generation in typical ICP condition, dwell time shorter than the transient event was suggested for fully profiling it. Herein we investigated the effect of dwell time (0.1–10.0 ms) on the signal profiles of single-cell events, signal-to-background ratio, duty cycle of detection, the limit of detection, and the ability of cell counting by the time-resolved ICP-MS, using yeast ( Saccharomyces cerevisiae ) cells as example. Two calibration equations with respect to the length of dwell time (0.1 ms or 5.0 ms), simply using dissolved metal standard solutions, were constructed and successfully applied to the determination of K, Mg, Zn, Mn, and Cu in single yeast cells. The limit of detection (LOD, fg per cell) obtained at dwell time 0.1 ms was 1.68 (K), 0.29 (Mg), 0.17 (Zn), 0.01 (Mn), and 0.02 (Cu) for single-cell analysis of yeast cells; the LOD (fg per cell) at 5.0 ms was 80.0 (K), 10.3 (Mg), 1.6 (Zn), 0. 14 (Mn), and 0.24 (Cu), respectively. The results showed that a short dwell time leading to high signal-to-background ratio and low LOD was a prerequisite for the quantitative analysis of ultra-trace content of metals in single cells.
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高影响因子
危险品化学品经营许可证（带存储）