Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Zhang Xianghua,Xu Hongxiang,Wang Jiangtao,Ye Xia,Lei Weining,Xue Maoquan,Tang Hua,Li Changsheng
In this paper, ultrathin WS 2 nanosheets with thickness of about 5 nm were successfully prepared by a facile solid phase reaction method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). On the basis of experimental results obtained under different reaction durations, a possible formation mechanism of WS 2 nanosheets is proposed. The tribological performance of ultrathin WS 2 nanosheets as additives in the 500SN base oil was tested by an UMT-2 ball-on-disc tribotester, and the worn surface of the steel disc was investigated by a non-contact optical profile testing instrument and SEM. The results showed that the friction coefficient and anti-wear property of base oil can be improved strikingly by adding ultrathin WS 2 nanosheets. Especially, when the concentration of WS 2 nanosheets was 1.0 wt.%, the corresponding lubricating oil exhibited the best tribological properties. Moreover, according to the investigation of the wear scar, an anti-friction and anti-wear mechanism is proposed. It is believed that the reduction of friction and wear must come from the addition of ultrathin WS 2 nanosheets which can penetrate and enter the friction interface and form a continuous tribofilm on the rubbing face.
研究领域:
材料科学
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摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Zedi He,Qiongfang Wang,Pinhua Rao,Lei Dong,Min Zhang,Xin Zhang,Naiyun Gao,Jing Deng
The use of antibiotics has become an indispensable part of the production and life of human society. Among them, sulfonamide antibiotics widely used in humans and animals are considered to be one of the most crucial antibiotics. However, antibiotics are difficult to degrade naturally, leading to an accumulation in the environment and a potential hazard to human health. In this paper, WS 2 as a co-catalyst could reduce trace Fe(III) to Fe(II) which exhibited a great activating ability to PS through the exposed W(IV) active sites, and formed the Fe(III)/Fe(II) cycle to degrade sulfachloropyridazine (SCP) continuously. This paper systematically discussed the degradation of SCP under different conditions in the PS/WS 2 /Fe(III) system, including the amount of WS 2 , Fe(III) concentration, PS concentration, initial pH, natural organic matter (NOM) and common anions ( NO 3 − , Cl − , HCO 3 − , HPO 4 2− and H 2 PO 4 − ). The experimental results showed that PS/WS 2 /Fe(III) system possessed a strong degradation ability for SCP in a wide pH range. NO 3 − and Cl − could promote the degradation of SCP a little. HCO 3 − , HPO 4 2− and H 2 PO 4 − could significantly inhibit the degradation of SCP. The main types of free radicals that degraded SCP were explored. In addition, the stability and reusability of WS 2 were examined, and two possible degradation pathways of SCP were proposed.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Xinrong Zhao,Meiqi Che,Yaqiong Gong
Hydrogen production from electrolytic water is a promising energy conversion method, which is green, low-carbon and environmentally friendly and it is essential to prepare efficient and low-cost electrocatalysts to improve the efficiency of water electrolysis. In this study, Fe 2 WO 6 @Ni 3 S 2 -WS 2 /NF was successfully synthesized by hydrothermal and electrodeposition methods, and its special nanoflower-like structure and synergistic effect among multi-components resulted in excellent catalytic performance and outstanding stability. The overpotential of Fe 2 WO 6 @Ni 3 S 2 -WS 2 /NF was 170 mV at 10 mA cm −2 in 1.0 M KOH for oxygen evolution reaction (OER) and it remains stable over 100 h, demonstrating its high catalytic activity and stability, making it suitable for prolonged OER processes. The increased activity of Fe 2 WO 6 @Ni 3 S 2 -WS 2 /NF can be attributed to the improved electron transport rate, the exposure of more active sites and the improved conductivity. This study provides a viable method for the preparation of efficient and robust OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Yinghan Yan,Cuiling Zhang,Wei Gu,Caiping Ding,Xinchang Li,Yuezhong Xian
A facile and eco-friendly approach for the synthesis of water-soluble WS2 quantum dots (QDs) was developed via ultrasonication and a hydrothermal process from bulk WS2. In this strategy, the dispersity of bulk WS2 in aqueous phase was improved with the aid of a surfactant (hexadecyltrimethylammonium bromide, CTAB), which could shorten the exfoliation time and improve the exfoliation efficiency to form layered WS2 nanosheets. Through hydrothermal treatment, the nanosheets were further scissored into QDs with high quality. The QDs show excellent features with narrow size distribution, good water solubility, and stable fluorescence. We find that the fluorescence of WS2 QDs can be quenched by Fe3+ through photoinduced electron transfer, and a wide detection linear range for Fe3+ is acquired. It indicates that WS2 QD can be used as a “turn-off” probe for Fe3+. In the presence of lipoic acid (LA), the fluorescence was recovered due to the stronger interaction between LA and Fe3+ than WS2 QDs. A “turn-on” sensor for LA was developed with a linear range from 1 to 10 μM and a detection limit of 0.59 μM. The strategy might be suitable for the facile synthesis of other water-soluble transition metal dichalcogenide QDs. It is expected that the water-soluble QDs have great potential applications in biological system.
研究领域:
材料科学
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分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Jianguo Liu,Yigong Guo,Zhanyu Wang,Xiao Xing,Gan Cui
Superhydrophobic coatings are renowned for their self-cleaning and water-repellent properties, making them increasingly valuable in industrial and consumer applications. Despite their widespread adoption, further enhancement of superhydrophobic performance remains a significant challenge. In this study, we introduce a novel approach to enhance the superhydrophobic capabilities of a composite coating by electrodepositing a Ni-WS 2 -PTFE composite coating under an applied magnetic field, notably improving its hydrophobic properties. The coupling of magnetic and electric fields induces a reorganization of the crystalline phase of nanoparticles within the plating solution, directly influencing the hydrophobicity of the composite coating. The water contact angle of the obtained Ni-WS2-PTFE composite coating reached 154°, with a minimum sliding angle of 4°. The coating also demonstrated excellent hydrophobic performance in both acid-base and weight-loss tests. After four weeks of immersion in a 3.5 % NaCl solution, the composite coating retained a corrosion resistance efficiency of 95 %. Magnetic fields play a beneficial role in the preparation of superhydrophobic coatings. While coatings produced through electrodeposition alone are not inherently superhydrophobic, the introduction of magnetic fields during the process imparts these desirable properties.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Hongjie Li,Yi He,Pingya Luo,Huilian Zhou,Bo Liu,Yahui He,Ruxia Song,Zhifei Zhang,Yi Fan
In this study, a novel superhydrophobic composite coating is prepared by a two-step method. Firstly, the Ni-based deposition coating is fabricated via composite electrodeposition with WS 2 granules worked as dispersed phase particles, and the roughness of deposit coating can be adjusted by changing the added amount of sulfide in the bath. The prepared Ni-WS 2 deposit exhibits sufficiently high roughness and suitable micro-nano morphology. Then, hexadecyltrimethoxysilane (HDTMS) is used to modify the deposition coating with low surface energy to obtain silanol-modified Ni-WS 2 coating with superhydrophobic properties. The superhydrophobic behavior of the composite coating conforms to the Cassie-Baxter model, with low adhesion to aqueous solutions. When the addition amount of WS 2 particles in the plating solution during the electrodeposition process is 5 g·L −1 , the prepared composite coating has the excellent superhydrophobic properties. The water contact angle of the composite coating is 154.7° ± 2 and the sliding angle can reach 6°. And the superhydrophobic composite coating exhibits excellent corrosion resistance .
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Penghao Liu,Zhiwei Jiang,Yongjian Zeng,Yaolin Wang,Chen Zeng,Xin Tu,Kai Yan
The efficient utilization of bamboo waste has attracted increasing interest as a promising solution to address the challenges associated with climate change and promote a more environmentally friendly approach to resource utilization. Herein, we demonstrated the highly selective production of furfural from bamboo through a microwave-assisted pyrolysis (MAP) process using WS 2 catalysts. Firstly, the content of furfural can be precisely regulated by manipulating key process conditions such as microwave power, temperature and the mass ratio of WS 2 to bamboo. Notably, compared to non-catalyzed MAP, the presence of the WS 2 catalyst significantly enhanced the production of both furfural and furan components. The optimal content of furfural and furan components reached up to 66.9 area% and 75.6 area% in bio-oil under the conditions of 700 W, 400 °C and a 3:10 WS 2 to bamboo ratio for 15 min. Furthermore, the liquid oil mainly consisted of C5 and C6 products (86.5 area%), indicating that MAP enhances the selectivity of small molecular products and furan compounds when coupled with the WS 2 catalyst. Experimental results revealed that WS 2 played bifunctional roles as a microwave absorbent and catalyst, promoting the bio-oil content and limiting the secondary pyrolysis of furan components, leading to a high selectivity of furan and a high content of furan products. This work provides valuable insights into producing furan-rich bio-oil from bamboo through MAP over transition metal dichalcogenides materials.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Zhuangzhi Wu,Min Ouyang,Dezhi Wang
As a typical n-type semiconductor, MoSe 2 is limited in the application of photoelectrocatalytic hydrogen evolution due to the rapid recombination of photo-generated electron-hole pairs. To solve this problem, in this work, a p-type WS 2 is selected to design a WS 2 /MoSe 2 hybrid semiconductor catalyst with a p-n heterojunction . The obtained samples were characterized by XRD , Raman, SEM, TEM, UV and XPS . Besides, the photoelectrocatalytic performances for hydrogen production were also evaluated. It was found that the WS 2 /MoSe 2 hybrid catalyst with a loading of 20% WS 2 (20W-M) showed the best photocatalytic performance with a photocurrent density of 35 μA cm -2 at -0.6 V (vs SCE), much larger than those of single MoSe 2 (20 μA cm -2 ) and WS 2 (3.5 μA cm -2 ). And the improved performances should be ascribed to the construction of p-n heterojunction , which leads to the change of photoelectron-hole transport mode, accelerates the separation speed of carriers and prolongs the carrier lifetime. This work demonstrates the promoting effect of WS 2 as a cocatalyst and this strategy can be extended to other semiconductors.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Mei Su,Honggang Sun,Zhixue Tian,Zihao Zhao,Pan Li
Herein, we designed and prepared a novel two-dimensional/two-dimensional WS 2 /Bi 2 WO 6 heterostructure photocatalyst. Firstly, by first-principles calculations, we found that Bi 2 WO 6 and WS 2 could form a stable WS 2 /Bi 2 WO 6 heterostructure with a type-II band alignment structure. Supporting by the theoretical prediction, a series of WS 2 /Bi 2 WO 6 heterostructures with different amounts of WS 2 were synthesized via a facile hydrothermal method. The WS 2 /Bi 2 WO 6 heterostructures exhibited higher photocatalytic activity in degradation of rhodamine B and oxytetracycline under visible light irradiation than the pure Bi 2 WO 6 and WS 2 . And the WS 2 /Bi 2 WO 6 heterostructure had a large specific surface area and good photo-stability. The photoluminescence spectra and photoelectrochemical measurements showed that the WS 2 /Bi 2 WO 6 heterostructure possessed the ability to facilitate the separation and transfer of photo-generated carries. The active species generated in the photocatalytic system were photo-induced holes, singlet oxygen, and superoxide anion, which were verified by the trapping experiments and electron spin resonance technique. Furthermore, a Z-scheme photocatalytic mechanism was proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yao Yao,Wenbin Dong,Zhen Zhao,Huina Cui,Gangli Liao
Metastable 1T phase transition-metal dichalcogenides materials have attracted substantial interest as a potential catalyst for photodegradation . However, methods for synthesizing 1T-WS 2 are limited and complicated. Herein, a flexible, structural stable, easy recovery and reusable photocatalyst 1T-WS 2 /Carbon cloth was developed through a simple solvothermal synthesis route. Vertically aligned 1T-WS 2 with large surface area renders ultrahigh photocatalytic activity and durability with respect to organic pollution methylene blue under simulated sunlight illumination. As a consequence, the 1T-WS 2 /CC-200 catalyst presents an improved photodegradation rate as high as 96 % and excellent reusability in continuous test mode. Moreover, the metastable 1T-WS 2 does not transform to stable 2 H phase, even after a five-months exposure in ambient, making the 1T-WS 2 /CC a promising photocatalyst for practical application.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Chemosensors
·
2021
·Vol. 10
·期 1
·9
·
IF 3.398
Qiyilan Guang,Baoyu Huang,Xiaogan Li
Gold nanoparticles decorated WS2microflakes (Au/WS2) have been synthesized by an in situ chemical reducing process. A chemiresistive-type sensor using as-synthesized Au/WS2heterostructures as sensing materials shows an improved response to different concentrations of ammonia compared to pure WS2at room temperature. As the concentrations of gold nanoparticles increased in heterostructures, response/recovery speeds of the sensors became faster although the sensitivity of the sensor was compromised compared to the sensitivity of the sensor with lower concentrations of Au. In addition, the Au/WS2-based sensor indicated excellent selectivity to formaldehyde, ethanol, benzene and acetone at room temperature. The improved performance of the sensors was attributed to the synergistic effect of electronic sensitization and chemical sensitization between WS2and Au.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Tao Feng,Yufan Mo,Shuo Lv,Gang Liu
Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS2 nanosheet hybrids (G-LS/WS2-LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS2-LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS2, the ternary nanocomposite (PANI/G-LS/WS2-LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS2-LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.
研究领域:
材料科学
·
能源存储
✓ 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）