Catalysts
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2017
·Vol. 7
·期 1
·18
·
IF 3.082
Liyan Zhou,Shancheng Yan,Han Wu,Haizeng Song,Yi Shi
Two-dimensional transition metal dichalcogenides, such as tungsten disulfide (WS2), have been actively studied as suitable candidates for photocatalysts due to their unique structural and electronic properties. The presence of active sites at the edges and the higher specific surface area of these materials are crucial to the photocatalytic activity of the hydrogen evolution reaction. Here, WS2quantum dots (QDs) have been successfully synthesized by using a combination of grinding and sonication techniques. The morphology of the QDs was observed, using transmission electron microscopy and an atomic force microscope, to have uniform sizes of less than 5 nm. Photoelectrochemical (PEC) measurements show that the current density of WS2QDs under illumination is almost two times higher than that of pristine WS2. Furthermore, these high-quality WS2QDs may have various applications in optoelectronics, solar cells, and biomedicine.Keywords:tungsten disulfide;quantum dots;sonication;photocatalysis
研究领域:
材料科学
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能源科学
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光电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Caicheng Long,Sicong Liu,Xiao Li,Jing Zhu,Lei Zhang,Taiping Qing,Peng Zhang,Bo Feng
In view of the increasing threat of chlortetracycline (CTC) in water to human health and the ecological environment, how to detect and remove CTC in wastewater simply and effectively remains an important and challenging task. Herein, a multifunctional platform for the simultaneous detection and degradation of CTC is developed by in-situ synthesis of carbon dots (CDs) in the two-dimensional (2D) WS 2 interface by covalent bonding. The as-prepared 2D WS 2 /CDs nanocomposites can not only be used as an intelligent fluorescence probe for CTC detection with good sensitivity (LOD = 7.5 nM) and selectivity but also has good photodegradation ability for CTC (degradation efficiency attained 85.58%). Moreover, the possible mechanisms for the detection and photodegradation of CTC by 2D WS 2 /CDs were also investigated by theoretical calculations, time-resolved fluorescence decay curves, and electron spin resonance (ESR) analyses. The exceptional photoelectric properties of 2D WS 2 /CDs are ascribed to the CDs bound onto the 2D WS 2 interface by covalent bonding forming heterojunctions, which effectively promote strong interfacial interactions between CDs and 2D WS 2 , thereby providing more effective charge transfer and enhancing the detection efficiency and photocatalytic activity. In addition, the possible degradation pathway for CTC was speculated via identification of intermediates and frontier electron density calculation. Overall, this study not only proves that the 2D WS 2 /CDs nanocomposites have great potential for the simultaneous detection and degradation of CTC in aquatic environments but also provides a novel idea for the efficient and stable design of multifunctional nanomaterials for environmental pollution monitoring and purification, which is of great significance to both practical applications and basic research.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2017
·
IF 2.686
A. Bayat,E. Saievar-Iranizad
Blue photoluminescent WS 2 quantum dots (QDs) were synthesized using a simple top-down method from natural raw mineral tungsten disulfide via tip ultrasonication followed by centrifugation in a water-ethanol (0.7/0.3 ratio) as eco-friendly solvent. Cavitation process at a high power (300 W) led to the breaking of bulk WS 2 flakes to its quantum dots. The as synthesized WS 2 QDs showed blue photoluminescence upon UV excitation. The synthesized WS 2 QDs were analysed by UV–vis and photoluminescence spectrophotometry , transmission electron microscopy , atomic force microscopy and X-ray diffraction. According to the transmission electron microscopy images, the size of WS 2 QDs was obtained as 5 nm in average.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2022
·
IF 5.907
Xinlei Xie,Yulei Wang,Ming Hao,Penji Yan,Jinsheng Liang,Dongxu Wang,Hao Li,Fei Wang
Two-dimensional tungsten disulfide (WS 2 ) nanosheets with large specific surface energies usually suffer from serious aggregation, hindering their catalytic activity and potential applications. In this work, highly dispersed WS 2 nanosheets were synthesized in a cost-effective way by employing sepiolite (Sep) nanofibers as the carrier via a hydrothermal treatment followed by calcination under H 2 /N 2 atmosphere, and the mass fraction of the raw materials including ammonium metatungstate, thioacetamide, oxalate acid and sepiolite were determined as 29.3 wt%, 35.7 wt%, 25.0 wt% and 10.0 wt%, respectively. The dispersed WS 2 nanosheets were uniformly grown on the Sep, as observed by an electron microscope . First principle calculations further revealed that the favorable bonding between the tungsten of WS 2 [W(WS 2 )] and the oxygen of Sep [O(Sep)] at the WS 2 /sepiolite interface enables Sep a unique support, superior to other minerals for growing such a highly-dispersed ultrathin WS 2 architecture. Compared with pure WS 2 , the as-prepared WS 2 /sepiolite composite exhibits about 7 times the specific surface area and 7.4 times the photocatalytic efficiency toward rhodamine B (RhB) degradation due to the better dispersion of WS 2 nanosheets and synergetic effects of sepiolite. Besides, the radical trapping experiment indicates that photo-generated hole (h + ) plays the leading role, while hydroxyl radical (·OH) and superoxide radical (·O 2 − ) act as the assistants during photocatalysis . This work provides a novel strategy for the low-cost preparation of high-quality two-dimensional materials via assembly on mineral materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Chenyu Song,Jishuang Yang,Shuangting Ren,Shree Kesavan Kannan,Shanhu Liu,Ruimin Xing
Due to the limited active sites and poor conductivity, the application of tungsten disulfide (WS 2 ) in alkaline water electrolysis remains a challenge. Herein, Ni-WS 2 nanosheet arrays were in situ grown on the carbon fiber paper (Ni-WS 2 /CFP) as an electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, and the introduction degree of Ni can be regulated by adjusting the electrodeposition time. When the electrodeposition time is 3 min, Ni ions are doped into the lattice of WS 2 , and by prolonging the electrodeposition time to 10 min, the nickel disulfide (NiS 2 ) crystal phase is generated to form NiS 2 @WS 2 heterojunction. The optimized Ni-WS 2 /CFP-10 min catalyst requires the overpotentials of 65 mV for HER and 251 mV for OER to achieve the current density of 10 mA cm −2 . A two-electrode water electrolysis device employing the Ni-WS 2 /CFP-10 min electrocatalyst requires a cell voltage of 1.63 V at the current density of 10 mA cm −2 . This work provides a new perspective for enhancing the electrocatalytic performance of WS 2 -based electrocatalysts by introducing heteroatoms and constructing heterojunction.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
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2018
·Vol. 8
·期 6
·205
·
IF 2.35
Yanfei Lv,Feng Huang,Luxi Zhang,Jiaxin Weng,Shichao Zhao,Zhenguo Ji
Tungsten disulfide (WS2) monolayer is a direct band gap semiconductor. The growth of WS2monolayer hinders the progress of its investigation. In this paper, we prepared the WS2monolayer through chemical vapor transport deposition. This method makes it easier for the growth of WS2monolayer through the heterogeneous nucleation-and-growth process. The crystal defects introduced by the heterogeneous nucleation could promote the photoluminescence (PL) emission. We observed the strong photoluminescence emission in the WS2monolayer, as well as thermal quenching, and the PL energy redshift as the temperature increases. We attribute the thermal quenching to the energy or charge transfer of the excitons. The redshift is related to the dipole moment of WS2.Keywords:chemical vapor transport deposition;tungsten disulfide;monolayer;photoluminescence
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 37
·21366-21378
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IF 12.732
Xiaomin Luo,Jianfeng Huang,Yixuan Huang,Liyun Cao,Jiayin Li,Yuhang Wang,Zhanwei Xu,Shiying Wei,Koji Kajiyoshi
Building composite structures of hollow metal sulfides and carbon material is considered an effective strategy for improving the performance of sodium storage. However, most of these composite structures are implemented using complex hard-templating and multiple-step methods. Moreover, the mechanism for enhancing the electrochemistry of carbon materials in hollow structures is not clear. In this work, a carbon-supported hollow tungsten disulfide (WS2) cuboid composite structure (marked H-WS2) was synthesized in one step by a self-templating method. On the one hand, the hollow composite structure can alleviate the volume changes during the charging and discharging processes, showing good structural stability. On the other hand, the pyrolytic carbon and nanosheet structure can effectively promote the transport of electrons/ions, exhibiting fast reaction kinetics. The H-WS2 electrode showed improved electrochemical performance for sodium storage. A high reversible capacity was achieved, 353.2 mA h g−1 after 100 cycles at 200 mA g−1. At a high current density of 5.0 A g−1, the reversible capacity of 236.7 mA h g−1 was still achieved. This work provides new insight into the synthesis of hollow metal sulfides and carbon composite structures.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2024
·Vol. 11
·期 1
·e202400426
·
IF 2.6
Yiting Wang,Xinran Zhao,Ruirui Cao,Jun Yang
The selection and optimization of cathode materials are crucial for enhancing the performance of aqueous zinc-ion batteries. In this work, different active materials were created by combining Sulfur powder and polydopamine in four different mass ratios. The novel N-doped carbon/WS 2 is obtained. Thanks to the optimization of the dopamine-carrying tungsten ion precursor and Sulfur powder (1 : 2, 1 : 4, 1 : 6 and 1 : 8), the four samples exhibited different morphology. The N−C/WS 2 -6-based zinc ion batteries with the highest specific capacity, 120.0 mAh/g in the first discharge at 2.0 A/g, and 78.0 mAh/g after 2500 cycles, with a capacity retention of 65 %, had a relatively good overall performance, according to the results. The reaction kinetics characteristics of the N−C/WS 2 -6 cathode reveal that diffusion has a significant impact on the processes in the aqueous zinc ionic material N−C/WS 2 -6.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Jing Xu,Zhong Dong,Yujin Li,Ke-Jing Huang,Kening Liu,Chengyuan Cao
Water system zinc ion batteries (ZIBs) displays the attractive advantages and it has been considered as the main energy storage device to replace lithium ion batteries (LIBs). Unfortunately, the existing cathode materials are far from achieving the excellent performance required by increasing energy consumption. In recent years, the popular MoS 2 materials still suffer from the inherent defects of poor electrical conductivity, unstable structure, and large volume expansion and lamellar stacking during charging and discharging, resulting in weak periodic stability and severely hindering its commercial applications. In view of the special requirements of cathode materials for ZIBs, this work innovatively proposes the construction of new-type ternary composite nanomaterials, comprehensively improve the practicability of MoS 2 materials. The experimental results confirm that the prepared MoS 2 @WS 2 @CC composite material has high specific capacity and excellent rate performance, due to the synergistic effect of conductive carbon fiber substrate and large layer spacing WS 2 which can improve the volume expansion and diffusion rate fundamentally. Therefore, we can predict that the MoS 2 @WS 2 @CC composite is expected to accelerate the commercial application of ZIBs, and provide ideas for the design of other energy storage materials.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Zhiqiang Zhang,Xiaofeng Lin,Shuli Tang,Qitong Huang
The development of highly active and stable electrocatalysts is essential to solve energy and environmental problems and realize sustainable social and economic development. Herein, we synthesized a bimetallic sulfide material by a kinetically controlled low-temperature solid-phase reaction. The bimetallic sulfide improves the conductivity of the electrocatalysts by optimized electronic structure, and the coupling effect at the heterogeneous interface of WS 2 and NiS x increases the charge density on the S site at W– S –Ni, making it easier for the electrocatalysts to trap the active material in solution. In addition, nanosheet clusters expose abundant catalytic sites, which together improve hydrogen evolution reaction (HER) for catalytic activity . Optimized WS 2 /NiS x composite show near-precious metal catalyst activity with an overpotential at 10 mA cm −2 of only 72 mV in alkaline media , which exhibits excellent catalytic stability and outperforms most non-precious metal electrocatalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Aiqin Liang,Danhua Zhu,Liming Xu,Weiqiang Zhou,Jingkun Xu,Xuemin Duan
A flexible ternary composite film based on polyvinyl alcohol (PVA), polyaniline (PANI) and WS2 was prepared via the electropolymerization of the prefabricated PVA/aniline/WS2 hydrogel. As-prepared PVA/PANI/WS2 composite film was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, energy dispersive X-ray spectrometry, and electrochemical technologies. The PVA/PANI/WS2 film had a specific capacitance of 2437 mF cm -2 at 2 mV s -1 in H2SO4 solution (1.0 M). After 5000 cycles, the capacitance retention reached 70% of initial specific capacitance. The high electrochemical behavior of composite film was mainly attributed to the ionic conductivity of PVA and the integration of pseudocapacitance of PANI and WS2. This flexible PVA/PANI/WS2 film provided a potential application in flexible supercapacitor.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Qiyilan Guang,Baoyu Huang,Jun Yu,Maryam Bonyani,Mohammad Moaddeli,Mansour Kanani,Ali Mirzaei,Hyoun Woo Kim,Sang Sub Kim,Xiaogan Li
In this paper, platinum sulfide decorated WS 2 microflakes (PtS/WS 2 ) heterostructure nanocomposites were prepared by an in-situ chemical reduction process. The chemiresistive-type gas sensor based on the synthesized PtS/WS 2 heterostructure nanocomposites exhibited a significantly improved sensing properties compared to that of the pure WS 2 microflakes at different concentration of NH 3 from 1 ppm to 10 ppm at room temperature . As the concentrations of PtS nanoparticles decorated on the surface of WS 2 microflakes increased, the response of the PtS/WS 2 heterostructure sensor to ammonia firstly increased when the concentration of PtS increased up to 1 wt%, whereas above 1%, the response decreased instead. Moreover, it was found that the response speeds of the PtS-decorated WS 2 were significantly improved compared to that pure WS 2 . The sensors also exhibited excellent selectivity to formaldehyde, toluene, acetone , methanol and ethanol at room temperature. The sensing mechanisms were studied by using the in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The enhanced sensing properties could be explained by “electronic sensitization” effect induced by the PtS/WS 2 heterostructure, being confirmed by density functional theory (DFT) calculations.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）