Materials Today Energy
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2019
·
IF 0
Baihua Cui,Meng Zhang,Yuxin Zhao,Shi Hu
Molybdenum sulfide (MoS 2 ) has been demonstrated to be a promising candidate to replace precious platinum catalysts for electrocatalytic hydrogen evolution reaction . However, MoS 2 typically suffers from unfavorable hydrogen desorption in alkaline solution and their positive HER kinetics largely relies on high overpotentials. Herein, we demonstrate a synergistically structural and electronic modulation strategy to improve the of MoS 2 . Heterogeneous core-shell structured Ni 3 S 2 @MoS 2 hollow nanoframe supported on Ni foam has been constructed by a combined three-step hydrothermal/sulfurization/calcination process to achieve three-dimensional hierarchical catalyst with multi-level interfaces. The optimized Ni 3 S 2 @MoS 2 catalyst presents low overpotentials of 60 mV to reach a current density of −10 mA cm −2 with Tafel slope of 48 mV dec −1 in 1.0 M KOH, and a satisfactory stability of 5000-circles of continuous operation. The large enhancement can be attributed to the thermodynamic and kinetic acceleration derived from synergistic effect of highly efficient electronic transmission (smooth heterojunction) and morphological peculiarity (rich active edges). This design provides valuable insights for re-engineering electrocatalysts by collaborating promoters toward the optimization of electrocatalytic activity of these unique materials and beyond.
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NANO
·
2018
·
IF 1.1
Xuehua Liu,Bingning Wang,Jine Liu,Zhen Kong,Binghui Xu,Yiqian Wang,Hongliang Li
A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS 2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS 2 /RGO) is described. It was found that single-layered or double-layered MoS 2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS 2 /RGO composites delivered a high reversible capacity of 900 mAhg − 1 after 200 cycles at a current density of 200 mAg − 1 as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS 2 layers deposited onto RGO sheets.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qinghua Deng,Tifang Miao,Ziqun Wang,Yun Xu,Xianliang Fu
Compositional regulation and modification of CdS are effective strategies to enhance its photocatalytic activity and stability. Herein, a series of MoS 2 modified Co 0.2 Cd 0.8 S nanorods (CCS) was synthesized by a hydrothermal method and used for photocatalytic hydrogen evolution reaction (HER) under visible light irradiation. The results indicated that the HER activity and stability of CdS could be substantially improved by the introduction of Co 2+ into CdS lattice, which can accelerate the separation of photoinduced charge carriers and avoid the formation of high oxidation power holes (h + ) due to the upward shift of the valence band edge. The HER performance of CCS could be further enhanced by the decoration of MoS 2 nanosheets. CCS loaded with 5% MoS 2 (wt%) showed the highest activity (2835.6 μmol·g −1 ·h −1 ), which is about 8.9 and 1.6 times higher than that of CdS and CCS. The type II heterojunction formed between CCS and the intimately contacted MoS 2 accounts for the improvement as MoS 2 can serve as trapping centers for photoinduced electrons (e − ) and active sites for HER. This work demonstrated that the activity and the stability of CdS for photocatalytic HER could be boosted by a consolidation of CoS with the host CdS to form a solid solution and a further decoration with low-cost MoS 2 cocatalyst.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Yao Yuan,Wei Wang,Yongqian Shi,Lei Song,Chao Ma,Yuan Hu
The extensive utilization of rigid polyurethane foam (RPUF) as construction insulation material has brought two main troubles to our society: fire risks and toxic hazards. To reduce the fire hazards of RPUF, a layered MoS 2 decorated with Cu 2 O nanoparticles was creativity obtained by hydrothermal technology and facile wet chemical treatment for reducing the toxic product formations of polyurethane nanocomposites during combustion. Due to the low weight ratio of Cu 2 O attached onto MoS 2 , the resulting Cu 2 O-MoS 2 hybrid effectively prevented the MoS 2 nanosheets from restacking. However, the Cu 2 O-MoS 2 -M hybrid was produced by increasing content of Cu 2 O, which has the characteristic stacked layer structure of MoS 2 . Reduced harmful organic volatiles and the toxic gases (e.g. a respective decrease of ca. 28% and 53% for CO and NO x products) were obtained because of synergistic effect between the physical adsorption of MoS 2 and catalysis action of Cu 2 O. Notably, the addition of Cu 2 O-MoS 2 hybrids led to high char formation of the RPUF nanocomposite, indicating the effectively catalytic carbonization property. In addition, the N-Gas model for predicting fire smoke toxicity was developed and demonstrated. Furthermore, the research offers direct proofs of the negative influence of the stacked MoS 2 on reducing the smoke toxicity for RPUF nanocomposites.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiufen Hu,Fang Deng,Weiya Huang,Guisheng Zeng,Xubiao Luo,Dionysios D. Dionysiou
ZnS-MoS 2 solid solution anchored on reduced graphene oxide sheet (rGO/ZnS-MoS 2 ) was explored as novel visible-light-driven photocatalysts, and synthesized by solvent thermal method. The light absorption intensity of rGO/ZnS-MoS 2 was greatly strengthened, and rGO/ZnS-MoS 2 possess modulated continuous band gaps from 3.47 to 3.56 eV by changing the Zn/Mo ratios and rGO content. Their photocatalytic activities for 2-nitrophenol degradation are dependent on the chemical composition, and the optimal 11% rGO/ZnS-MoS 2 possessed the highest photocatalytic performance, which could be attributed to the most efficient charge separation, the largest specific area, and its optimized band structure. Moreover, 11% rGO/ZnS-MoS 2 can effectively treat real industrial effluent with 74.05% COD removal, and maintain long-term stability without obvious decline after five use cycle.
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高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 10
·1350-1356
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IF 4.446
Zhenhua Liao,Qingwei Li,Jiabao Zhang,Juan Xu,Biao Gao,Paul K. Chu,Kaifu Huo
Graphical Stand up straight : Vertically oriented MoS 2 nanoflakes on N-doped carbon nanosheets (MoS 2 /NC) are produced, which serve as the large-capacity, high-rate, and long-life anodes for lithium-ion batteries. The MoS 2 /NC electrode shows excellent cycling stability with a reversible capacity of 722 mAh g −1 at 100 mA g −1 after 100 cycles as well as a rate performance of 554 mAh g −1 at 2000 mA g −1 . MoS 2 is a promising anode material for lithium-ion batteries (LIBs) because of its layered structure, analogous to that of graphite, and high lithium storage capacity of 670 mAh g −1 . However, its practical implementation in LIBs is hindered by poor conductivity, large volume change, and possible polysulfide shuttling during cycling. In this work, oriented MoS 2 nanoflakes grown on N-doped carbon nanosheets (MoS 2 /NC) are investigated as high-performance anodes in LIBs. The materials are prepared by annealing dodecylamine-intercalated MoO 3 nanosheets under Ar at 400 °C, followed by a hydrothermal treatment in the thiourea (CH 4 N 2 S) solution at 220 °C for 30 h. In the MoS 2 /NC structure, the NC nanosheets constitute a long-range conductive network for fast electron transfer, whereas the oriented MoS 2 nanoflakes provide sufficient active sites for Li + storage and fast Li + diffusion along the a – b plane. Consequently, the MoS 2 /NC electrode shows a remarkable capacity of 803 mAh g −1 at a current density of 100 mA g −1 , a high rate capability of 554 mAh g −1 at 2000 mA g −1 , and excellent cycle stability. Our results reveal a facile and general method to produce high-performance heterostructured MoS 2 /NC anodes and the process can be extended to other metal dichalcogenides for future high-performance LIBs.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-10
·
IF 5.705
Yang Haimei,Jie Xu,Wang Lu,Zhang Yue,Wang Min,Wei Weili
A fluorescent array based on the use of saccharide-functionalized multicolored quantum dots (s-QDs) and of 4-mercaptophenylboronic acid-functionalized MoS 2 nanosheets (PBA-MoS 2 ) was constructed for multiple identification and quantitation of lectins and bacteria. In this array, the fluorescence of the s-QDs is quenched by the PBA-MoS 2 nanosheets. In the presence of multiple lectins, s-QDs differentially detach from the surface of PBA-MoS 2 nanosheets, producing distinct fluorescence response patterns due to both quenching and enhancement of fluorescence. By analyzing the fluorescence responses with linear discriminant analysis, multiple lectins and bacteria were accurately identified with 100% accuracy. The limits of detection of Concanavalin A , Pisum sativum agglutinin, Peanut agglutinin, and Ricius communis I agglutinin are as low as 3.7, 8.3, 4.2 and 3.9 nM, respectively. The array has further been evidenced to be potent for distinguishing and quantifying different bacterial species by recognizing their surface lectins. The detection limits of Escherichia coli and Enterococcus faecium are 87 and 66 cfu mL −1 , respectively.
Schematic of a fluorometric array based on the use of saccharides-functionalized quantum dots (s-QDs) and 4-mercaptophenylboronic acid-functionalized MoS 2 (PBA- MoS 2 ) nanosheets. This array was successfully applied to simultaneously analysis of lectins, bacteria in real samples with high sensitivity and accuracy.
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高影响因子
Small
·
2018
·Vol. 14
·期 45
·1802290
·
IF 9.598
Qin Gao,Xiao Zhang,Wenyan Yin,Dongqing Ma,Changjian Xie,Lirong Zheng,Xinghua Dong,Linqiang Mei,Jie Yu,Chaozhan Wang,Zhanjun Gu,Yuliang Zhao
The rising dangers of bacterial infections have created an urgent need for the development of a new generation of antibacterial nanoagents and therapeutics. A new near-infrared 808 nm laser-mediated nitric oxide (NO)-releasing nanovehicle (MoS 2 -BNN6) is reported through the simple assembly of α-cyclodextrin-modified MoS 2 nanosheets with a heat-sensitive NO donor N , N ′-di-sec-butyl- N , N ′-dinitroso-1,4-phenylenediamine (BNN6) for the rapid and effective treatment of three typical Gram-negative and Gram-positive bacteria (ampicillin-resistant Escherichia coli , heat-resistant Escherichia faecalis , and pathogen Staphylococcus aureus ). This MoS 2 -BNN6 nanovehicle has good biocompatibility and can be captured by bacteria to increase opportunities of NO diffusion to the bacterial surface. Once stimulated by 808 nm laser irradiation, the MoS 2 -BNN6 nanovehicle not only exhibits photothermal therapy (PTT) efficacy but also can precisely control NO release, generating oxidative/nitrosative stress. The temperature-enhanced catalytic function of MoS 2 induced by 808 nm laser irradiation simultaneously accelerates the oxidation of glutathione. This acceleration disrupts the balance of antioxidants, ultimately resulting in significant DNA damage to the bacteria. Within 10 min, the MoS 2 -BNN6 with enhanced PTT/NO synergetic antibacterial function achieves >97.2% inactivation of bacteria. The safe synergetic therapy strategy can also effectively repair wounds through the formation of collagen fibers and elimination of inflammation during tissue reconstruction.
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高影响因子
BIOMATERIALS
·
2019
·
IF 10.273
Zhang Yuan,Bailong Tao,Ye He,Ju Liu,Chuanchuan Lin,Xinkun Shen,Yao Ding,Yonglin Yu,Caiyun Mu,Peng Liu,Kaiyong Cai
To inhibit bacterial infection in situ and improve osseointegration are essentially important for long-term survival of an orthopedic implant , in particular for infection-associating revision surgery. Herein, we fabricate a functional molybdenum disulfide (MoS 2 )/polydopamine (PDA)-arginine-glycine-aspartic acid (RGD) coating on titanium (Ti) implant to address above concerns simultaneously. The coating not only improved the osteogenesis of mesenchymal stem cells (MSCs), but also endowed Ti substrates with effective antibacterial ability when exposing to near-infrared (NIR) irradiation. It accelerated glutathione (GSH) oxidation via photothermal energy and induced intrinsic ROS-independent oxidative stress damage deriving from MoS 2 nanosheets . The results displayed that RGD-decorated MoS 2 nanosheets significantly increased the cellular osteogenic behaviors of MSCs via up-regulating osteogenesis-related genes (ALP, Runx2, Col I and OCN) in vitro. Moreover, the functionalized Ti substrates demonstrated great antibacterial efficiency of over 92.6% inhibition for S. aureus and E. coli under NIR-irradiation. Hyperthermia induced by photothermal effect accelerated the GSH consumption and ROS-independent oxidative stress destroyed the integrity of bacteria membranes , which synergistically led to protein leakage and ATP decrease. Furthermore, co-culture experiment showed that S. aureus contamination was efficiently cleaned from MoS 2 /PDA-RGD surface after NIR photothermal treatment, while MSCs adhered and proliferated on the MoS 2 /PDA-RGD surface. In an S. aureus infection model in vivo, MoS 2 /PDA-RGD modified Ti rods killed bacteria with an efficiency of 94.6% under NIR irradiation, without causing damage to normal tissue. More importantly, the MoS 2 /PDA-RGD modified Ti implants accelerated new bone formation in comparison with TNT implants in vivo .
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高影响因子
Molecular Medicine Reports
·
2018
·Vol. 18
·期 3
·3193-3202
·
IF 1.922
Bo Yan,Dongsheng Wang,Qiang Wang,Xiaolan Lu,Qin Du,Qi Liang,Xingliang Jiang,Xiaolan Guo,Jingguo Zhou,Yan Xing
At present, the majority of methods used for uric acid (UA) detection are not able to meet the detection requirements with speed, accuracy, high sensitivity, high specificity, a wide linear range or a low cost. Compared with other methods, the electrochemical method has a high sensitivity and fast detection. The present study aimed to identify an electrochemical sensor with high sensitivity, fast detection and a wide linear range for the detection of UA. A glassy carbon electrode modified with graphene‑molybdenum disulfide‑Nafion (G‑MoS2‑Nafion) composites was prepared for use as the working electrode. The morphologies and elemental compositions of the G‑MoS2 composites were characterized by field emission scanning electron microscopy, elemental distribution spectrometry and X‑ray diffraction, respectively. The electrochemical behaviors were investigated by cyclic voltammetry, linear sweep voltammetry and the amperometric i‑t curve (i‑t). The interference of glucose, ascorbic acid and dopamine, and the accuracy and precision of the electrochemical method were subsequently evaluated. The present study identified the following: (1) Only the reduction peak of UA was detected in human serum, indicating that the method established in the present study has a high specificity for the determination of UA in human serum; (2) UA concentration has a linear correlation with current intensity (y=0.012x+0.998; R2=0.998), wide linear range and high sensitivity (minimum detectability=13.91 µM; signal‑to‑noise ratio=3); (3) the values of UA content in human serum were positively proportional to the clinical results (y=0.9802x+11.494; R2=0.978); (4) the average recovery rate of UA (95.28%) and the replicability assay of the i‑t electrochemical method (coefficient of variation=2.04%), suggest that the method had a high accuracy and good precision for UA detection. Due to its characteristics of good accuracy, high sensitivity, wide linear range, good anti‑interference ability and replicability, G‑MoS2‑Nafion has good prospects for UA detection in the clinical setting.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Wei Li,Ran Bi,Guoxue Liu,Yaxi Tian,Lei Zhang
Molybdenum disulfide (MoS2) has attracted extensive research interest as a fascinating anode for sodium-ion batteries (SIBs) because of its high specific capacity of 670 mA h g–1. However, unsatisfied cycling durability and poor rate performance are two barriers that hinder MoS2 for practical application in SIBs. Herein, 3D interconnected MoS2 with enlarged interlayer spacing epitaxially grown on 1D electrospinning carbon nanofibers (denoted as MoS2@CNFs) was prepared as a flexible anode for SIBs via l-cysteine-assisted hydrothermal method. Benefitting from the C–O–Mo bonding between the CNFs and MoS2 as well as the rational design with novel structure, including the well-retained 3D interconnected and conductive MoS2@CNFs networks and expanded (002) plane interlayer space, the flexible MoS2@CNFs electrode achieves a remarkable specific capacity (528 mA h g–1 at 100 mA g–1), superior rate performance (412 mA h g–1 at 1 A g–1), and ultralong cycle life (over 600 cycles at 1 A g–1 with excellent Coulombic efficiencies exceeding 99%). The elaborate strategy developed in this work opens a new avenue to prepare highly improved energy storage materials, especially suitable for flexible electronics.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 32
·9856-9864
·
IF 6.641
Di Yin,Ming-Liang Wang,Ying-Zi Wang,Xun Hu,Bo Liu,Hong Liu,Lulu Ma,Guang-Gang Gao
A ternary nanocomposite containing ZnO, ZnS and MoS2 (ZnMoNCs) has been firstly synthesized by Keggin-type polyoxomolybdate and ZIF-8 as starting materials to provide Mo and Zn sources simultaneously. As compared to the mono- or bi-component complex, ZnMoNCs present more sensitive and stable surface-enhanced Raman scattering (SERS) activity. When rhodamine 6G is used as a probing molecule, the detection limit of 10−9 mol L−1 can be achieved on the ZnMoNC substrate with the enhancement factor (EF) of 1.4 × 108, which is the highest sensitivity among the known semiconductor SERS substrates. The increased adsorption sites and the synergistically improved charge transfer are conducive to the large enhancement of the SERS activity. It was also proved that the ZnMoNC substrate possesses high stability and self-cleaning properties, and can be reused in SERS detection without losing its activity even after 5 cycles. This work paves a new way to the design of new semiconductor SERS substrates by the utility of a multicomponent complex.
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高影响因子
危险品化学品经营许可证（带存储）