Nanoscale
·
2014
·Vol. 6
·期 11
·5762-5769
·
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
·
电化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
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
✓ 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
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Lubricants
·
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
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
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2017
·
IF 2.594
Zhaopeng Liu,Yan Xu,Zhenhua Li,Baowei Wang,Weihan Wang,Xinbin Ma,Renjie Liu
In this paper, Ce 0.2 Zr 0.8 O 2 composite supports were prepared by different Ce-addition methods including impregnation of cerium (CeZr-imp), impregnation of citric acid and cerium (CeZr-CA) simultaneously and deposition precipitation method (CeZr-DP), respectively. The as-prepared supports were applied to prepare 10 wt% MoO 3 /Ce 0.2 Zr 0.8 O 2 catalysts for sulfur-resistant methanation . The N 2 adsorption/desorption, X-ray diffraction (XRD), Raman spectroscopy (RS), X-ray photoelectron (XPS), temperature-programmed reduction by hydrogen (H 2 -TPR) were undertaken to get textural properties, morphological information and structures of the catalysts. The results showed that MoO 3 was highly dispersed on the surface of these three supports and Ce was mostly of coexisted in Ce 4+ /Ce 3+ redox pairs. Compared with Mo/CeZr-imp, the CO conversion increased by 10% and 15% for Mo/CeZr-CA and Mo/CeZr-DP, respectively. This was mainly attributed to the larger specific surface area, Ce 3+ concentration and content of active MoS 2 on the surface of catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3329
·
IF 5.719
Luogang Xie,Yang Yang,Gaoshang Gong,Shiquan Feng,Dewei Liu
Lead ions in water are harmful to human health and ecosystems because of their high toxicity and nondegradability. It is important to explore effective fluorescence probes for Pb2+detection. In this work, surface-functionalized molybdenum disulfide quantum dots (MoS2QDs) were prepared using a hydrothermal method, and ammonium tetrathiomolybdate and glutathione were used as precursors. The photoluminescence quantum yield of MoS2QDs can be improved to 20.4%, which is higher than that for MoS2QDs reported in current research. The as-prepared MoS2QDs demonstrate high selectivity and sensitivity for Pb2+ions, and the limit of detection is 0.056 μM. The photoluminescence decay dynamics for MoS2QDs in the presence of Pb2+ions in different concentrations indicate that the fluorescence quenching originated from nonradiative electron transfer from excited MoS2QDs to the Pb2+ion. The prepared MoS2QDs have great prospect and are expected to become a good method for lead ion detection.Keywords:molybdenum disulfide;quantum dots;lead ion;fluorescence probe
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Aihua Yan,Tongyang Zhang,Fei Huang,Quande Wang,Shijian Lu,Wenxue Zhao,Ye Gao,Zigao Su,Huaqi Yuan
Multiplex modification is considered as one of attractive methods to achieve highly-efficient photocatalytic water splitting into hydrogen evolution performance. Herein, MoS 2 /S v -ZnIn 2 S 4 /ZnS (MS/S v -ZIS/ZS) composites were constructed by a facile in-situ engineering technique. The sulfur vacancy, Ohmic-type contact and I-type heterojunction were systematically integrated into the composites. The unique structure could not only facilitate a directional charge transfer and accelerate the charge extraction, but also enhance the charge utilization and improve the hydrogen reduction reaction dynamics. As a result, the composites exhibited a promoted hydrogen evolution rate of 9.5 mmol g −1 h −1 , which was about 3.8 times higher than that of pure ZIS. This work may extend the in-situ preparation strategy and motivate the intensive investigation of high-efficiency ZIS-based photocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yunze Li,Changfeng lu,Kai Gao,Yi Zhang,Lin Zhang,Guoxin Xie
Perfluoropolyether (PFPE) is an excellent high-temperature lubricant; however, its poor affinity with additives such as MoS 2 , a common high-temperature lubricant additive, often leads to agglomeration and settling during storage, thereby reducing its tribological performance. To address this challenge, this study investigates the chemical grafting of MoS 2 using Trimethoxy (1H,1H,2H,2H-perfluorodecyl) silane (TMFS), achieving stable MoS 2 dispersion in PFPE that remains effective for up to 180 days. The grafted MoS 2 exhibits remarkable thermal stability, maintaining its integrity without decomposition even at temperatures reaching 250 °C. Compared with pure PFPE, the modified lubricant demonstrates a remarkably 36.8 % reduction in coefficient of friction and an 81.6 % decrease in wear rate at 200 °C. This research provides crucial theoretical insights and practical guidance for the future design of high-performance high-temperature lubrication systems.
研究领域:
材料科学
·
化学工程
·
机械工程
✓ 已验证
产品关联
DOI
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
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2018
·Vol. 5
·期 1
·1800548
·
IF 5.466
Changzeng Yan,Tianhang Yu,Chao Ji,Dae Joon Kang,Ning Wang,Rong Sun,Ching-Ping Wong
Ever-increasing packaging and power densities of modern electronic devices in the present “More-than-Moore” technology era demand higher performance thermal interface materials (TIMs). However, conventional composite TIMs require higher loading to achieve better thermal conductive property, resulting in a mechanical problem. The poor wetting property of matrix loading materials further increases the interfacial thermal resistance (ITR). In this work, a one-step hydrothermal method is employed to grow 2D molybdenum disulfide (MoS 2 ) nanosheets on a tellurium (Te) nanowire skeleton and silver (Ag) nanoparticles are further decorated on MoS 2 nanosheets via the photoreduction method. The in-plane thermal conductivity of the final nanocomposite reaches as high as 10.4 W m −1 K −1 , which is 4,160% higher than that of a pure epoxy resin and one order of magnitude higher than that of conventional polymeric nanocomposites. The 3D interconnected heat transferring network of Te/MoS 2 /Ag greatly enhances the thermal stability of the composite in practical applications. The rational materials design concept may contribute to the development of new types of high-performance thermal management materials.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Jing Dong,Wenjian Fang,Hui Yuan,Weiwei Xia,Xianghua Zeng,Wenfeng Shangguan
Studies on highly efficient noble-metal-free catalysts are regarded as an important task for H2 production by water-splitting. MoS2/ZnCdS/ZnS dual heterostructures were successfully prepared with respective supernatant MoS2 colloidal solutions (called M/ZC/Z) and MoS2 precipitates (M(p)/ZC/Z). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of the M/ZC/Z sample showed that ZnS nanosheets were decorated with ZnCdS nanorods and few-layered MoS2. Then, photocatalytic hydrogen production study was performed and the results showed that the M/ZC/Z sample has a H2 evolution rate of up to 79.3 mmol g–1 h–1 under visible light irradiation with an apparent quantum efficiency of 47.9% at 420 nm with noble-metal-free catalysts, which is nearly 5 times that of the M(p)/ZC/Z sample (15.7 mmol g–1 h–1) and approximately 9 times that of the ZC/Z sample (8.98 mmol g–1 h–1). Cycle tests showed that M/ZC/Z is stable and reusable. Without sacrificial agents, the production rates for hydrogen and oxygen evolution were obtained as 3.15 and 1.55 mmol g–1 h–1, respectively. Time-resolved photoluminescence spectra revealed that the well-matched structure is effective in the separation and transfer of photogenerated electron and hole pairs, leading to the enhancement of the photocatalytic H2 production activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
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