INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Qiulan Zhou,Xiaohu Luo,Yali Li,Yanxia Nan,Haoyun Deng,Encai Ou,Weijian Xu
MoS 2 has been one of a widely researched hydrogen evolution reaction (HER) catalyst materials in recent years. However, the basal plane of MoS 2 is considered to be inactive to hinder its further development. Herein, a new mass-scalable and facile intercalation method for the fabrication of multiple products, including pore-rich monolayer MoS 2 (PR MoS 2 ) and MoS 2 quantum dots (MoS 2 QDs), has been developed via the gas phase etching of bulk MoS 2 in an acetone vapor atmosphere. The obtained monolayer MoS 2 QDs with a narrow lateral size distribution (average size: 2.5 nm) present excitation-independent photoluminescence emission. Furthermore, the PR MoS 2 shows a significantly enhanced HER electrocatalytic activity and good stability in 0.5 M H 2 SO 4 solution with a small overpotential of 241 mV at a current density of 10 mA cm −2 . These results demonstrate that the as-prepared PR MoS 2 is very promising for the application in HER.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-7
·
IF 3.159
Tan Xi,Kang Wenbin,Liu Jingfeng,Zhang Chuhong
Molybdenum disulfide (MoS 2 ) is an extremely intriguing low-D layered material due to its exotic electronic, optical, and mechanical properties, which could be well exploited for numerous applications to energy storage, sensing, and catalysis, etc., provided a sufficiently low number of layers is achieved. A facile exfoliation strategy that leads to the production of few-layered MoS 2 is proposed wherein the exfoliation efficacy could be synergistically boosted to > 90% by exploiting ultrasound sonication in supercritical CO 2 in conjunction with N -methyl-2-pyrrolidone (NMP) as the intercalating solvent, which is superior to general practiced liquid exfoliation methods wherein only the supernatant is collected to avoid the majority of unexfoliated sediments. The facile and fast exfoliation technique suggests an exciting and feasible solution for scalable production of few-layered MoS 2 and establishes a platform that contributes to fulfilling the full potential of this versatile two-dimensional material.
研究领域:
材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 11
·5762-5769
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IF 6.739
Lihui Yuwen,Fei Xu,Bing Xue,Zhimin Luo,Qi Zhang,Biqing Bao,Shao Su,Lixing Weng,Wei Huang,Lianhui Wang
A general and facile method for water-dispersed noble metal (Au, Ag, Pd, Pt) nanocrystal modified MoS2 nanosheets (NM–MoS2 NSs) has been developed. By using sodium carboxymethyl cellulose as a stabilizer, well-dispersed NM–MoS2 NSs with homogeneously deposited noble metal nanocrystals (NM NCs) can be synthesized in aqueous solutions. Due to the transition from the semiconducting 2H phase to the metallic 1T phase, the chemically exfoliated MoS2 (ce-MoS2) NSs have improved electrochemical activity. The partially metallic nature of the ce-MoS2 NSs and the catalytic activity of the NM NCs synergistically make NM–MoS2 NSs a potential electrochemical catalyst. For the first time, Pd–MoS2 NSs were used as an electrocatalyst for methanol oxidation in alkaline media. The results showed that Pd–MoS2 NSs have enhanced catalytic activity with 2.8-fold anodic peak current mass density compared to a commercial Pd/C catalyst, suggesting potential for application in direct methanol fuel cells (DMFCs).
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Coatings
·
2017
·Vol. 7
·期 6
·78
·
IF 2.175
Shengzhong Jin,Shichao Zhao,Jiaxin Weng,Yanfei Lv
Molybdenum disulphide (MoS2) monolayer is a two-dimensional semiconductor material with potential applications in nano electronic devices. However, it is still a challenge to reproducibly synthesize single layer MoS2in high quality. Herein, we report the growth of monolayer of MoS2on the SiO2/Si substrate with manganese heterogeneous nucleation. It was shown that the Mn promotes the growth of monolayer MoS2via heterogeneous nucleation. The growth temperature range expanded two-fold, the nucleation density increased as well. The monolayer prepared in the presence of Mn exhibits a unique red emission peak at 732 nm at room temperature compared to the sample in the absence of Mn.Keywords:molybdenum disulphide;heterogeneous nucleation;growth;photoluminescence
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
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2017
·Vol. 110
·期 12
·
IF 3.411
Zhuang YuKai,Dai LiDong,Wu Lei,Li HePing,Hu HaiYing,Liu KaiXiang,Yang LinFei,Pu Chang
This report presents a pressure-induced permanent metallization for MoS 2 under non-hydrostatic conditions. Impedance and Raman spectra were measured to study the pressure-induced structural and electronic transformations of MoS 2 at up to ∼25 GPa in diamond anvil cells under both non-hydrostatic and hydrostatic conditions. The results show evidence for isostructural hexagonal distortion from 2 Hc to 2 Ha and metallization at ∼17 GPa and ∼20 GPa under non-hydrostatic and hydrostatic conditions, respectively. Interestingly, the metallization is irreversible only under non-hydrostatic compression. We attribute this phenomenon to the incorporation of molecules of pressure medium between layers, which mitigate compressed stress and reduce interlayer interaction.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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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.
研究领域:
纳米技术
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分析化学
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生物传感器
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 32
·49267-49278
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IF 5.19
Peng Huan,Chen Rong,Tao Ningyao,Xiao Yangyi,Li Chenxing,Zhang Tuqiao,Ye Miaomiao
Activation of peroxymonosulfate (PMS) by Fe 2+ is a green oxidation process for degradation of organic contaminants. However, the formation of iron mud and low PMS utilization lead to the decreased oxidation efficiency. In this work, commercial MoS 2 particles were used as the catalyst for boosting the Fe 2+ /PMS process for carbamazepine (CBZ) removal. The CBZ removal efficiency by the MoS 2 /Fe 2+ /PMS process was significantly enhanced, increasing to 6.5 times that of the Fe 2+ /PMS process. The Fe 3+ was reduced to Fe 2+ by the exposed Mo 4+ on the surface of MoS 2 , leading to the enhanced PMS utilization rate and increased Fe 2+ concentration. The relative intensity of DMPO-HO• and DMPO- SO 4 – • followed the order of MoS 2 /PMS < Fe 2+ /PMS < MoS 2 /Fe 2+ /PMS, also suggesting the enhanced oxidation activity with the addition of MoS 2 in the process of Fe 2+ /PMS. The commercial MoS 2 had good stability shown by the CBZ removal efficiency remaining almost unchanged during 8-time cycling use. Finally, a possible CBZ degradation pathway was proposed for helping understand the oxidation mechanism of the MoS 2 /Fe 2+ /PMS process.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yongpeng Ma,Jiandong Wang,Wentao Gu,Xiaojing Zhang,Haomiao Xu,Wenjun Huang,Yonghui Guo,Shaobo Wang
Herein, MoS 2 was used in a MoS 2 /H 2 O heterogeneous system for the heterogeneously catalyzed removal of Hg 0 from flue gas. Hg 0 removal efficiency reached 77.6% at 25 °C when the dosage of MoS 2 was 0.200 g/L in aqueous suspension. The observed effects of MoS 2 dosage and inlet Hg 0 concentration on Hg 0 removal efficiency revealed that the gas–liquid mass transfer process is the limiting step of Hg 0 removal. Low pH and low temperature were conducive to Hg 0 removal. SO 2 in the flue gas was absorbed by MoS 2 , and the simultaneous decrease in solution pH resulted in a slight increase in Hg 0 removal efficiency. The presence of NO in the flue gas enhanced Hg 0 removal efficiency. Common anions, such as NO 3 − , SO 4 2− , and CO 3 2− , have no obvious effect on Hg 0 removal. However, Cl − improved Hg 0 removal efficiency by 11% because of the production of HgCl n 2−n . The kinetics and mechanism of Hg 0 removal were studied, and the results indicated that Mo acted as a bridge and catalyst for Hg 0 oxidation, while S immobilized Hg 2+ by formation of HgS on MoS 2 .
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
·
IF 1.193
Ri WANG,Chen-Yu XIONG,Yong XIE,Ming-Jie HAN,Yu-Hao XU,Chao BIAN,Shan-Hong XIA
Mercury ions (Hg 2+ ) are highly toxic and can cause serious harm to the environment and human health. In this study, we prepared a novel electrochemical sensor based on an electrode coated with chitosan/graphene oxide/molybdenum disulfide/Au nanoparticles (chitosan/GO/MoS 2 /AuNPs) and thymine-Hg 2+ -thymine base pair to detect trace Hg 2+ in water. This method effectively utilized the affinity of MoS 2 to immobilize deoxyribonucleic acid (DNA) on the electrode surface and enabled the amplification of the electrochemical signals detected by the sensor. The specific binding of the thymine-Hg 2+ -thymine base pair and the electrochemical activity of MoS 2 successfully reduced the detection limit of Hg 2+ and rendered it interference resistant. In the presence of Hg 2+ , a double-stranded structure was formed on the electrode after the interaction between Hg 2+ and DNA, which caused the change of the oxidation current signal of the electrode surface. The sensor showed good linearity ranging from 0.01 μg/L to 4 μg/L with a correlation coefficient of 0.991, and the limit of detection was found to be 5.8 ng/L. This portable chitosan/GO/MoS 2 /AuNPs modified electrode showed satisfactory recovery in tap water samples, thus demonstrating its potential for application in trace Hg 2+ detection.
研究领域:
环境科学
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分析化学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1030
·
IF 3.9
Siyi Jiang,Yujing Weng,Yangbin Ren,Shihang Meng,Xiaoman Li,Chao Huang,Yulong Zhang,Qi Sun
The chemical transformation of carbon dioxide (CO2) not only reduces the amount of carbon dioxide emitted into the Earth’s atmosphere by humans, but also produces carbon compounds that can be used as precursors for chemical and fuel production. Herein, a selective catalytic conversion of carbon dioxide to methanol is achieved by a bifunctional molybdenum disulfide catalyst (MoS2) with magnesium oxide and nickel and potassium promoters. Molybdenum disulfide prepared by the supercritical ethanol method has a large specific surface area and presents good catalytic performance with high methanol selectivity when loaded with potassium (K) and nickel (Ni) promoters. In addition, the catalysts were evaluated and it was founded that the addition of the K-promoter improved methanol selectivity. This research provides a new strategy for improved product selectivity and space–time yield (STY) of methanol in CO2hydrogenation.Keywords:CO2hydrogenation;molybdenum disulfide;methanol
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Lubricants
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2023
·Vol. 11
·期 12
·524
·
IF 3.5
Yaping Xing,Ebo Liu,Bailin Ren,Lisha Liu,Zhiguo Liu,Bocheng Zhu,Xiaotian Wang,Zhengfeng Jia,Weifang Han,Yungang Bai
In this study, willow catkins/MoS2nanoparticles (denoted as WCMSs) have been prepared using a hydrothermal method. The WCMSs were modified with oleic acid (OA) to improve dispersion in base oil. The friction and wear properties of WCMSs in liquid paraffin (LP) for steel balls were investigated using a four-ball wear tester. The results have shown that at a high reaction temperature, willow catkins (being used as a template) and urea (being used as a nitrogen resource) can effectively decrease the wear scar diameters (WSDs) and coefficients of friction (COFs). At a concentration of 0.5 wt.%, the WSD and COF of steel balls, when lubricated using LP containing modified WCMS with urea, decreased from 0.65 mm and 0.175 of pure LP to 0.46 mm and 0.09, respectively. The addition of urea and hydroxylated catkins can generate a significant number of loose nano-sheets and even graphene-like sheets. The weak van der Waals forces, decreasing the shear forces that the steel balls must overcome, provide effective lubrication during rotation. On the other hand, the tribo-films containing MoS2, FeS, azide, metal oxides and other compounds play important roles in reducing friction and facilitating anti-wear properties.Keywords:willow catkins;MoS2;hydrothermal;urea;wear
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sulfur Chemistry
·
2025
·
IF 1.6
Yongpeng Ma,Jianghui Du,Haobing Yan,Chaobin Shi
Molybdenum disulfide (MoS2) is considered a favorable absorbent for removing heavy metals. However, due to its various morphologies, MoS2 exhibits significant differences in its performance for removing mercury from flue gas. In the present study, the flower-like, spherical MoS2 and W-MoS2 were prepared by regulating the interlayer spacing and doping tungsten (W) in MoS2 for removing gaseous mercury (Hg0). The results show that the number of active sulfur sites (S2- and S22-) was critical to the adsorption performance of MoS2 for Hg0. The flower-like MoS2 demonstrated optimum properties below 125°C which attributed to the presence of dominated S2- sites, while spherical MoS2 and W-MoS2 showed a wider application temperature range (up to 175°C) during Hg0 removal which attributed to the unsaturated sulfur S22- and active oxygen. In terms of the mechanism, Hg0 is directly inserted into the Mo-S bond of MoS2 to form a transition state [Hg·Mo]-S, and then the original Mo-S is interrupted to form a new β-Hg-S bond, or combine with surface oxidation to form HgO. The oxygen in the flue gas can supplement the surface active oxygen on the MoS2, which enables the circulation of Mo5+. Hg0 also reacted with S22- to form α-HgS.
研究领域:
环境科学
·
材料科学
✓ 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）