Nanomaterials
·
2020
·Vol. 10
·期 2
·278
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IF 4.324
Guiping Li,Yongli Wang,Jingtao Bi,Xin Huang,Yafei Mao,Liang Luo,Hongxun Hao
In this work, a facile oxidation strategy was developed to prepare novel tungsten disulfide/tungsten trioxide (WS2/WO3) heterostructures for adsorbing organic dyes efficiently by combining the hydrophilic property of WO3and the superior dye affinity of WS2. The structural and elemental properties of the synthesized hybrid materials were systematically investigated, and the results demonstrated the retained flower-like morphology of the primitive WS2and the successful introduction of WO3. Furthermore, surface properties such as a superior hydrophilicity and negative-charged potential were also demonstrated by a water contact angle characterization combined with a Zeta potential analysis. The performance of the obtained WS2/WO3hybrid materials for removing Rhodamine B (RhB) from wastewater was evaluated. The results showed that the maximum adsorption capacity of the newly synthesized material could reach 237.1 mg/g. Besides, the adsorption isotherms were also simulated by a statistical physics monolayer model, which revealed the non-horizontal orientation of adsorbates and endothermic physical interaction. Finally, the adsorption mechanism and the recyclability revealed that the partial oxidation strategy could contribute to a higher adsorption capacity by modulating the surface properties and could be applied as a highly efficient strategy to design other transition metal dichalcogenides (TMDs) heterostructures for removing organic dyes from wastewater.Keywords:WS2/WO3heterostructure;surface property;partial oxidation;hydrophilicity;adsorption mechanism
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
PubMed
高影响因子
Nano Energy
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2014
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IF 10.211
Yu Liu,Wei Wang,Yewu Wang,Xinsheng Peng
It is well known that the nanocomponents with opposite charges can be easily assembled into hybrid composites via electrostatic interaction , but it is difficult for like-charged nanomaterials . Here, we developed a general method to directly assemble lamellar composite paper composed of both negative-charged WS 2 and graphene oxide (GO) nanosheets from their aqueous dispersion through filtration process . After hydrothermal reduction, the flexible lamellar WS 2 /reduced-graphene oxide (rGO) paper was evaluated as binder-free anodes for Li-ion batteries, which presented a reversible capacity of 697.7 mA h g −1 after 100 cycles, 8 times higher than 88.5 mA h g −1 of pure WS 2 nanosheets and 60.2 mA h g −1 of rGO, excellent cyclic stability and good rate capacity. In the uniformly alternated lamellar structures , rGO nanosheets efficiently prevent the restacking of WS 2 sheets, increase the conductivity of the electrode, and sustain the volume expansion during Li + insertion/extraction, which significantly improved the electrochemical performances. This simple filtration assembling method provides a general and efficient way to synthesize functional composite films from like-charged colloid solutions.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Wenxu Yin,Xue Bai,Ping Chen,Xiaoyu Zhang,Liang Su,Changyin Ji,Haoming Gao,Hongwei Song,William W. Yu
Transition-metal dichalcogenides like tungsten disulfide (WS2) are luminescent but still bear low quantum yields and hardly meet the requirement of practical applications. Here, we developed a hot-injection method to prepare highly luminescent WS2 quantum dots with tunable particle size in a noncoordinating solvent, some that are even smaller than its Bohr radius. The as-synthesized WS2 quantum dots exhibit a narrow size distribution and a high photoluminescence quantum yield of 32%, the highest record compared to the known reports. The WS2 quantum dot layer was employed to fabricate white light-emitting diodes with a maximum brightness of 507 cd/m2, adjustable color temperatures from 4100 to 10 000 K, and excellent color rendering index of 91. These results confirm the promising optoelectronic applications of WS2 quantum dots.
研究领域:
材料科学
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光学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Deqing Zhang,Honghan Wang,Junye Cheng,Changyu Han,Xiuying Yang,Jingyu Xu,Guangcun Shan,Guangping Zheng,Maosheng Cao
Herein, ultra-thin tungsten disulfide nanosheets/carbon nanotubes (WS 2 -NS/CNTs) hybrids were successfully synthesized by using a one-step hydrothermal method. The WS 2 -NS is evenly grown on the surfaces of CNTs , leading to a remarkable three-dimensional (3D) heterostructure. Outstanding electromagnetic wave absorption performance of the WS 2 -NS/CNTs hybrids can be achieved by tuning the amount of CNTs. The minimum reflection loss can reach up to −51.6 dB at 14.8 GHz, and the effective absorption bandwidth is 5.4 GHz for the hybrids with a thickness of 1.95 mm. Comparison of the results with those of simple mixtures of WS 2 -NS and CNTs prepared by using ultrasonic methods indicates that the absorption performance of the optimized WS 2 -NS/CNTs hybrids are closely related to that of the 3D mesh conductive network constructed by the addition of CNTs and the synergistic effect of WS 2 -NS and CNTs in the hybrids. These WS 2 -NS/CNTs hybrids open a new avenue for the development of electromagnetic wave absorbers with extraordinary absorption performance, light weight, small thickness, broad absorption bandwidth, and low cost.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Nature Synthesis
·
2024
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IF 0
Mei Liang,Gao Zhan,Yang Ruijie,Zhang Zhen,Sun Mingzi,Liang Xiongyi,Zhang Yuefeng,Ying Ting,Hu Honglu,Li Dengfeng,Zhang Qinghua,Gu M. Danny,Gu Lin,Zhou Jiang,Huang Bolong,Voiry Damien,Zeng Xiao Cheng,Chai Yang,Li Ju,Yu Xinge,Zeng Zhiyuan
Crystal phase plays a crucial role in determining the properties of two-dimensional (2D) transition metal dichalcogenides. Here we achieve phase-switchable preparation of 2D transition metal dichalcogenides using an electrochemical lithium-ion intercalation-based exfoliation strategy by controlling the discharge current density and cutoff voltage. We discover that a small discharge current density (0.005 A g −1 , with a 0.9 V cutoff voltage) produces pure semiconducting 2H phase WS 2 bilayers. In contrast, a large discharge current density (0.02 A g −1 , with a 0.7 V cutoff voltage) leads to the dominant semimetallic 1T′ phase WS 2 monolayers. The phase-switching mechanism was clarified through cryo-electron microscopy, annular dark-field scanning transmission electron microscopy, Raman, X-ray photoelectron spectroscopy, etc. The device (humidity sensor) application of produced 2D WS 2 was then demonstrated, showing phase-dependent humidity-sensing performances confirming the potential of our produced 2D WS 2 with switchable phase in device applications.
研究领域:
材料科学
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纳米技术
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电化学
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传感器
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 47
·24128-24138
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IF 7.443
Guowei Huang,Hao Liu,Shengping Wang,Xi Yang,Binhong Liu,Hongzheng Chen,Mingsheng Xu
Hierarchical architecture of ultrathin interlayer-expanded WS2 nanosheets supported on three-dimensional graphene (3DG) frameworks is fabricated by a facile hydrothermal method for the first time. The 3DG frameworks could provide large surface area for assembling WS2 nanosheets and continuous pathways for rapid electron transfer and ion transport; and the WS2 nanosheets with an expanded interlayer spacing of 9.58 Å, due to oxygen incorporation, could afford more space for lithium ion intercalation and more active sites for hydrogen evolution. The as-prepared WS2/3DG composite exhibits a high capacity of 766 mA h g−1 and excellent cycling stability for lithium storage, much better than its annealed counterpart and bulk WS2. The hydrated sheet of WS2/3DG also demonstrates boosted electrocatalytic activity for the hydrogen evolution reaction, possessing a low onset overpotential of 75 mV and an extremely large current density of 137 mA cm−2 at 300 mV with remarkable durability. This work may open up a new pathway for improving the electrochemical properties by synergistically optimizing the electrode architectures and the intrinsic electroactivity of the active materials.
研究领域:
材料科学
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能源存储与转换
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jianjian Yi,Xiaojie She,Yanhua Song,Mao Mao,Kaixiang Xia,Yuanguo Xu,Zhao Mo,Jingjie Wu,Hui Xu,Huaming Li
To date, despite significant achievements in noble-metal co-catalysts, it is still challenging to develop high-performance noble-metal-alternative co-catalysts for economic hydrogen production. In this work, we demonstrate that the metallic 1T-WS 2 obtained through a facile solvothermal method can function as co-catalyst for boosting the photocatalytic hydrogen production with the merits below: (i) noble-metal-free; (ii) excellent electrical conductivity; (iii) extra active sites on basal plane rather than edge sites for H 2 generation. As demonstrated in photocatalytic hydrogen evolution, the designed composite using two-dimensional carbon nitride (2D-C 3 N 4 ) as semiconductor and 1T-WS 2 as co-catalyst (1T-WS 2 /2D-C 3 N 4 ) exhibits giant enhancement, in comparison with the bare 2D-C 3 N 4 and 2H-WS 2 /2D-C 3 N 4 . This work highlights the surface engineering strategy of co-catalysts such as phase engineering for promoting the photocatalytic performance.
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
Journal of Water Process Engineering
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2023
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IF 7
Yajuan Li,Qiongfang Wang,Xin Zhang,Lei Dong,Yulin Yuan,Cheng Peng,Min Zhang,Pinhua Rao,Md. Nahid Pervez,Naiyun Gao
In this study, MFe 2 O 4 /WS 2 (M = Co, Cu, Mn, Ni) catalysts were synthesized to activate peroxymonosulfate (PMS) for sulfathiazole (STZ) degradation by decorating with WS 2 on the surface of a series of spinel-type transition metal oxides . It was found that the CoFe 2 O 4 /WS 2 /PMS exhibited a greater ability to degrade sulfathiazole (STZ) than other systems. More specifically, the catalyst facilitated Fe 3+ /Fe 2+ recycling to activate PMS efficiently and maintained synergies between CoFe 2 O 4 and WS 2 to degrade pollutants. The CoFe 2 O 4 /WS 2 dosage, PMS concentration, solution pH, inorganic anions, and natural organic matter, which could affect the catalytic efficiency, were inspected. The experimental results manifested that the catalyst displayed outstanding performance in the pH range from 5 to 9. Besides, electron paramagnetic resonance spectroscopy and radical quenching experiments confirmed the presence of HO•, SO 4 •− , O 2 •− , and 1 O 2 . Based on detected intermediates, the plausible degradation pathway of STZ was proposed.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Lubricants
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2024
·Vol. 12
·期 5
·163
·
IF 3.1
Yunqi Fang,Yang Sun,Fengqin Shang,Jing Zhang,Jiayu Yao,Zihan Yan,Hangyan Shen
Van der Waals heterostructures with incommensurate contact interfaces show excellent tribological performance, which provides solutions for the development of new solid lubricants. In this paper, a facile electrostatic layer-by-layer self-assembly (LBL) technique was proposed to prepare multi-layer van der Waals heterostructures tungsten disulfide/hexagonal boron nitride (vdWH WS2/h-BN). The h-BN and WS2were modified with poly (diallyldimethylammonium chloride) (PDDA) and sodium dodecyl benzene sulfonate (SDBS) to obtain the positively charged PDDA@h-BN and the negatively charged SDBS@WS2, respectively. When the mass ratio of PDDA to h-BN and SDBS to WS2were both 1:1 and the pH was 3, the zeta potential of PDDA@h-BN and SDBS@WS2were 60.0 mV and −50.1 mV, respectively. Under the electrostatic interaction, the PDDA@h-BN and SDBS@WS2attracted each other and stacked alternately along the (002) crystal plane forming the multi-layer (four-layer) vdWH WS2/h-BN. The addition of the multi-layer vdWH WS2/h-BN (1.0 wt%) to the base oil resulted in a significant reduction of 33.8% in the friction coefficient (0.104) and 16.8% in the wear rate (4.43 × 10−5mm3/(N·m)). The excellent tribological property of the multi-layer vdWH WS2/h-BN arose from the lattice mismatch (26.0%), a 15-fold higher interlayer slip possibility, and the formation of transfer film at the contact interface. This study provided an easily accessible method for the multi-layer vdWH with excellent tribological properties.
研究领域:
材料科学
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摩擦学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
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IF 3.019
Yongsheng Dong,Shengzhou Chen,Jialei Liu,Jinlong Lei,Fenggang Liu,Wei Yang,Jiahai Wang
In this study, the water-evaporation-induced assembly of a graphene oxide-ammonium metatungstate hydrate multilayer film was developed. After chemical reduction and high-temperature sulfurization, a graphene-WS 2 composite nanofilm with microcavities was obtained. When evaluated as an anode material in a lithium-ion battery, the graphene-WS 2 sample (precursor graphene oxide/WS 2 mass ratio of 1:4) exhibited high initial specific capacity (∼980 mAh g −1 at 0.1 A g −1 ), optimal cycling performance (∼450 mAh g −1 after 100 cycles at 0.1 A g −1 ), and superior rate capability (∼300 mAh g −1 at 2 A g −1 ). The graphene/WS 2 mass ratio influenced the contact between WS 2 and graphene and the porous nanofilm structure facilitated the kinetics of lithium-ion diffusion.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Lei Liu,Shaoyi Qu,Zhaoxian Yang,Yingbo Chen
Salt accumulation often occurs in conventional processes for textile wastewater treatment, which affects the dye removal efficiency and water recovery rate. Nanofiltration is a feasible way to fractionate dye/NaCl mixtures. In this study, to enhance the dye/salt separation efficacy, two-dimensional (2D) WS2 nanosheets were incorporated and coordinately bonded to polyelectrolytes for fabricating layer-by-layer hybrid nanofiltration membranes. The incorporation of WS2 enhanced the hydrophilicity and surface negativity of the membrane. Further, the stacking of WS2 nanosheets and their frictionless surface promoted water transportation in polyelectrolyte multilayers. WS2-incorporated membrane (2 wt %) exhibited the highest pure water flux and achieved separation factors of 7238 and 9036 during filtration of Conge red/NaCl and reactive black 5/NaCl binary solutions, respectively. Moreover, the instability of the multilayered polyelectrolyte membrane in high ionic strength solutions was overcome by the incorporation of WS2, and the WS2-incorporated membrane showed better antifouling performance toward model organic foulants.
研究领域:
环境工程
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材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Shuai Fu,Wei Yuan,Xianming Liu,Yunhui Yan,Haiping Liu,Li Li,Fengying Zhao,Jianguo Zhou
In this study, a novel 0D/2D WS 2 /BiOBr heterostructured photocatalyst with rich oxygen vacancies was fabricated by a hydrothermal method. The WS 2 QDs/BiOBr-10 heterostructures exhibited a maximum removal rate of 92% towards ciprofloxacin (CIP) within 100 min under visible-light irradiation, which was 2.63- and 2.02- folds higher activity than that of pristine BiOBr and WS 2 QDs/BiOBr-10 with poor oxygen vacancies, respectively. In addition, the removal efficiencies of this photocatalyst towards various pollutants were 99% (Lanasol Red 5B), 95% (Rhodamine B), 85% (metronidazole), 96% (tetracycline) and 41% (Bisphenol A), respectively. Besides, the simultaneous photocatalytic degradation showed the competitive interactions between these organic contaminants for the active species, decreasing the removal efficiency for CIP. However, the simultaneous photocatalytic oxidation of CIP and reduction of Cr(VI) improved the utilization efficiency of photo-induced electrons and holes, resulting in high removal efficiencies for both CIP and Cr(VI). Three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) were used to investigate the degradation of CIP molecules. The synergistic effect of heterostructure and oxygen vacancies greatly assisted in the removal of organic pollutants, attributing to the enhanced visible-light harvesting and effective separation of photo-induced electron–hole pairs. Furthermore, trapping experiments and ESR results demonstrated that the CIP removal was dominated by the direct oxidation of holes (h + ), whereas the hydroxyl radicals ( OH) and superoxide radicals ( O 2 − ) acted as auxiliary active species. This study provides a new way to rationally design and construct active 0D/2D pattern heterojunction photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）