ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Fang Zheng,Niu Huang,Rongcheng Peng,Yuyue Ding,Guowang Li,Zhifen Xia,Panpan Sun,Xiaohua Sun,Jiguo Geng
Molybdenum disulfide (MoS 2 ) is considered as a promising candidate to Pt-based catalysts. Literatures report the active centers of MoS 2 locate at its edges, while the perfect in-plane domains are not active. In this study, a simple Co Mo S precursor decomposition approach is used to synthesize Co-doped MoS 2 in-situ grown graphite paper (GP) substrate. Electrochemical analyses reveal the Co-doped MoS 2 possesses excellent electrocatalytic activity comparable to Pt. Density functional theory (DFT) calculations indicate the inert in-plane S atoms neighboring the doped Co atoms become active towards triiodide reduction, as revealed by the adsorption energies ( E ad ) of iodine atom decreasing from 0.36 eV to −0.52 eV, identical with value obtained from Pt (−0.52 eV). Due to increased active sites, highly conductive of GP, and excellent electrical connection between Co-doped MoS 2 and GP substrate, the dye-sensitized solar cell fabricated using Co-doped MoS 2 /GP as counter electrode (CE) shows higher photoelectric conversion efficiency (7.26%) than those based on MoS 2 /GP CE (6.57%) and platinized F-doped tin oxide (Pt/FTO) electrode (6.87%).
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Weiwei Zhang,Zhipeng Mou,Yazhe Wang,Ying Chen,Endong Yang,Feng Guo,Dongdong Sun,Weiyun Wang
A method was developed for the liquid exfoliation of molybdenum disulfide (MoS 2 ) from its bulk materials using ultrasound in aqueous phase with the assistance of chitosan (CS) and silver nanoparticles (Ag NPs) for effective loading of a variety of therapeutic molecules. The characterization results revealed that the as-made chemically-exfoliated MoS 2 nanosheets had an average thickness of ∼10 nm. The new material, CS and Ag NPs-modified MoS 2 (MoS 2 -CS-Ag), showed highly effective antifungal activities against Saccharomyces uvarum and Aspergillus niger . The Ag NPs-loaded MoS 2 nanosheets achieved outstanding antifungal effect by inhibiting fungal growth both in vitro and in vivo . Notably, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis of spore morphological changes caused by MoS 2 -CS-Ag treatment reveal that it may directly cause the cell death. The result of the analysis of the application of MoS 2 -CS-Ag as an antifungal for fruits also demonstrated the MoS 2 -CS-Ag protective properties against fungi. The excellent film-forming ability of CS has been shown to contribute to the effectiveness of MoS 2 -CS-Ag in preserving the freshness of fruits, exhibited in four chemical quality sections: Vc, total carbohydrate, weight loss, and titratable acidity in fruit preservation application assay. The present study reports a new and exciting insight in a multi-functional drug carrier for protecting postharvest fruit.
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TALANTA
·
2019
·
IF 4.916
Ankita Sinha,Yujin Huang,Huimin Zhao
The present work reports development of advanced nanosensor platform based on hierarchical 3D nanotubes assembled from MoS 2 mono layers (3D MoS 2 NTs) for rapid and selective screening of well known carbamate fungicide, diethofencarb . The assembly of ultrathin MoS 2 layers possessed mesopores and large specific surface area which enabled its potential implementation in electrode fabrication. Preparation of 3D MoS 2 NTs helped to avoid restacking and aggregation during its utilization as sensor material and manifested great sensing abilities towards electro-oxidation of diethofencarb. The LOD and LOQ for diethofencarb at 3D MoS 2 NTs/GCE were calculated as 0.32 ng μL −1 and 1.09 ng μL −1 in the concentration range of 1–55 ng μL −1 by square wave voltammetry (SWV) and further 0.63 ng μL −1 and 2.11 ng μL −1 in the concentration range of 1–35 ng μL −1 by differential pulse voltammetry (DPV). The developed 3D MoS 2 NTs nanosensor was successfully used to quantify diethofencarb in river water sample with satisfied recovery of 94.23%–105.46% justifying its analytical utility in pesticide screening. The study drives immense motivation towards sensing of hazardous pesticides using nanomaterials based advanced sensing devices for environmental monitoring.
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Lubricants
·
2026
·Vol. 14
·期 3
·114
·
IF 3.6
Hanzhi Yao,Yuting Zhao,Bo Gao,Ruizhe Li,Tianxu Gao,Xiang Liu,Xianhao Gu,Zhongnan Wang,Qiuying Chang
Molybdenum disulfide (MoS2)-based composite systems are widely used as solid lubricating coatings. However, further optimization towards lower friction and higher wear resistance remains necessary to meet the extreme operating conditions and high reliability requirements of next-generation aerospace equipment. This study investigated the tribological performance of MoS2/epoxy composite coatings by comparing the effects of individual and combined additions of nano nickel (Ni) and magnesium silicate hydroxide (MSH). The coating preparation process adopted in this study is the bonding method. Experimental results showed that, under a load of 2 N and a rotational speed of 500 r/min, the coating containing 0.3 g Ni and 0.1 g MSH (labeled W03Ni01MSH) achieved a 22% reduction in wear scar width compared to the coating with only Ni, demonstrating a distinct synergistic effect. This is attributed to the complementary roles of the two additives: Ni promotes the formation of flaky wear debris, facilitating rapid formation and stabilization of a transfer film, thereby reducing friction; MSH enhances the load carrying capacity of the coating and suppresses wear propagation, thereby improving wear resistance. Furthermore, this composite coating exhibited optimal performance under the conditions of 500 r/min and 2 N. The results of this study significantly improved the friction-reducing and wear-resistant properties of the MoS2/epoxy composite coating. This provides a new strategy for the formulation design of high-performance solid lubricating coatings.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuying Jiang,Xibin Zhou,Yifeng E,Pengyan Wei,Peng Chen,Li Li,Zhuozhe Li,Thomas F. Krenzel,Kun Qian
The design and synthesis of novel electrode catalysts is an applicable strategy to improve the performance of direct methanol fuel cells (DMFCs). The catalyst is composed of molybdenum disulfide as the shell and nickel silicide-doped sodalite (MoS 2 /NiSi@SOD) as the core. A series of characterization results indicate that NiSi is highly dispersed in the nanosized SOD cage on the surface of the SOD zeolite at the crystal faces of (011), (102), and (201). A thin conductive protective cover is formed by MoS 2 on the surface of the zeolite . By the cyclic voltammetry (CV), the catalyst performs a maximum current density of 46.9 mA cm −2 (1250.1 A g Ni −1 ) with 10 M methanol while no remarkable catalyst poisoning and catalyst deactivation are observed. It is revealed that MoS 2 /NiSi@SOD under high catalysis activity protects the Ni from the drain in the alkaline electrolyte , leading to a broad application prospect as a noble-metals-free DMFC catalyst.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 5
·515-525
·
IF 3.815
Luo Hua-Bin,Pan Xiao-Ren,Yang Jing-Hui,Qi Xiao-Dong,Wang Yong
High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy storage. The rational structural design of hybrid fillers can lead to a balance between high dielectric constant and insulation in composites. In this work, novel hybrid fillers were fabricated by in situ synthesizing one-dimensional polypyrrole nanowires (PPynws) on the two-dimensional molybdenum disulfide (MoS 2 ), which integrated the good ion polarization ability of PPynws and the high insulation and adjustable band gap of MoS 2 . Compared with the binary poly(vinylidene fluoride) (PVDF)/MoS 2 composites, the PVDF/MoS 2 -PPynws composites exhibited remarkably improved dielectric constant and breakdown strength, while the dielectric loss was still maintained at a low level. An optimal ternary composite with 1 wt% MoS 2 -PPynws showed a high dielectric constant (15@1kHz), suppressed dielectric loss (0.027@1kHz), and high breakdown strength (422.1 MV/m). PPynws inducing strong interfacial polarization and the highly insulated MoS 2 nanosheets extending the breakdown path mainly contributed to the synchronously enhanced dielectric constant and breakdown strength. This intriguing synthesis method of PVDF/MoS 2 -PPynws nanocomposite will open up new opportunities for fabricating nanostructured polymer composites to produce high dielectric materials.
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CHEMOSPHERE
·
2022
·
IF 8.943
Lei Fan,Yuguo Gong,Jiafeng Wan,Yuhan Wei,Haolin Shi,Chuntao Liu
In this work, flower-like molybdenum disulfide was constructed on the surface of ZIF-8-derived nitrogen-doped dodecahedral carbon (ZNC) for the electrocatalytic degradation of phenol. The flower-like nanostructure of MoS 2 @ZNC contributed to the exposure of more edge-active sites of MoS 2 . At the same time, Mo 4+ and Mo 6+ co-existed in MoS 2 @ZNC, which promoted the generation of H 2 O 2 and •OH, and improved the catalytic activity of composite materials. In addition, electrochemical performance analysis showed that MoS 2 loaded on the surface of ZNC significantly improved the redox capacity of the material, and the composite ratio of MoS 2 and ZNC affected the structure and properties of MoS 2 @ZNC composites. Moreover, the electrochemical performance of prepared MoS 2 @ZNC was evaluated by the generation of hydroxyl (•OH) and the degradation efficiency of phenol. The results showed that MoS 2 @ZNC-2 had an excellent phenol degradation efficiency (98.8%) and COD removal efficiency (86.8%) within 120 min. Furthermore, MoS 2 @ZNC cathode still maintained good performance after being experimented with 20 times, indicated the excellent stability of MoS 2 @ZNC.
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Materials Today Energy
·
2020
·
IF 5.604
L. Zheng,W. Zhang,B. Gao,H. Lu,X. Fan,Y. Zhang,Y. Wang,S. Wang,Q. Gao,Y. Tang
Transition metal dichalcogenides (TMDs) are regarded as the inexpensive and stable electrocatalysts for hydrogen evolution reaction (HER). Designing an electrocatalyst with few-layered molybdenum disulfide (MoS 2 ) is one of the most effective methods to enhance the activity and durability for HER due to its abundant exposed rim-sites, fast electron transfer and high chemical stability. Herein, a green and facile one-pot approach is developed to synthesize few-layered MoS 2 /nitrogen, sulfur codoped porous carbon (MoS 2 /NSPC) electrocatalyst via pyrolyzing the in-situ formed molybdate-melamine complex (MoO x -MEL) within the self-assembled networks of melamine-trithiocyanuric acid (MT). The optimal MoS 2 /NSPC electrocatalyst exhibits excellent HER stability and activity with overpotential of 114 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 . Furthermore, few-layered tungsten disulfide anchored on N, S-codoped porous carbon (WS 2 /NSPC) with high HER activity can also be successfully synthesized by this strategy. It paves a universal way to design active sites–enriched few-layered dichalcogenides with high performance in the applications from energy conversion to storages.
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Membranes
·
2021
·Vol. 11
·期 2
·96
·
IF 4.106
Huali Tian,Xing Wu,Kaisong Zhang
Tight ultrafiltration (TUF) membranes with high performance have attracted more and more attention in the separation of organic molecules. To improve membrane performance, some methods such as interface polymerization have been applied. However, these approaches have complex operation procedures. In this study, a polydopamine (PDA) modified MoS2(MoS2@PDA) blending polyethersulfone (PES) membrane with smaller pore size and excellent selectivity was fabricated by a simple phase inversion method. The molecular weight cut-off (MWCO) of as-prepared MoS2@PDA mixed matrix membranes (MMMs) changes, and the effective separation of dye molecules in MoS2@PDA MMMs with different concentrations were obtained. The addition amount of MoS2@PDA increased from 0 to 4.5 wt %, resulting in a series of membranes with the MWCO values of 7402.29, 7007.89, 5803.58, 5589.50, 6632.77, and 6664.55 Da. The MWCO of the membrane M3 (3.0 wt %) was the lowest, the pore size was defined as 2.62 nm, and the pure water flux was 42.0 L m−2h−1bar−1. The rejection of Chromotrope 2B (C2B), Reactive Blue 4 (RB4), and Janus Green B (JGB) in aqueous solution with different concentrations of dyes was better than that of unmodified membrane. The separation effect of M3 and M0 on JGB at different pH values was also investigated. The rejection rate of M3 to JGB was higher than M0 at different pH ranges from 3 to 11. The rejection of M3 was 98.17–99.88%. When pH was 11, the rejection of membranes decreased with the extension of separation time. Specifically, at 180 min, the rejection of M0 and M3 dropped to 77.59% and 88.61%, respectively. In addition, the membrane had a very low retention of salt ions, Nacl 1.58%, Na2SO410.52%, MgSO44.64%, and MgCl21.55%, reflecting the potential for separating salts and dyes of MoS2@PDA/PES MMMs.Keywords:tight ultrafiltration membrane;molybdenum disulfide;dopamine;two-dimensional nanomaterial;polyethersulfone
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PubMed
高影响因子
ANALYST
·
2020
·Vol. 145
·期 19
·6369-6377
·
IF 3.978
Lingna Kong,Xinguang Zhou,Guoyue Shi,Yanyan Yu
A novel and simple “off-to-on” fluorescent sensing platform for β-amyloid oligomers (Aβo) was developed based on dye (FAM)-labeled single-strand DNA (FAM-ssDNA)-conjugated molybdenum disulfide nanosheets (MoS2 NSs). Due to strong adsorption of ss-DNA to the surface of MoS2 NSs, the fluorescence of FAM was quenched remarkably, leading to a fluorescent “off” state. However, in the presence of Aβo, a hybrid structure between Aβo and FAM-ssDNA resulted in the dissociation of FAM-ssDNA from MoS2 NSs and an obvious fluorescence recovery transformed the fluorescence to an “on” state. The developed fluorescence sensing assay showed a good linear relationship toward Aβo ranging from 0.01 to 20 μM (R2 = 0.994) with a satisfactory detection limit of 3.1 nM. Practical samples of hippocampus and cortex tissues from APP/PS1 double transgenic AD mice were applied to demonstrate feasibility of the assay. Moreover, we found that similar to MoS2 nanoparticles, MoS2 NSs possessed therapeutic effects on Alzheimer's disease (AD) by inhibiting Aβ aggregations and degrading the previously formed Aβ fibrils. Collectively, the high sensitivity, specificity, and good biocompatibility along with an efficient anti-aggregation ability, the presented fluorescent strategy with MoS2 NSs demonstrated their promising potential for future AD-related research.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Weitian Cai,Dionysios D. Dionysiou,Fenglian Fu,Bing Tang
The treatment of heavy metal pollution in aquatic environment, especially the pollution caused by multiple heavy metal ions, has been a growing global concern for decades. To address this problem, it is urgent to explore effective and low cost adsorbents which can remove multiple heavy metal ions simultaneously. Herein, Cr(VI) and Ni(II) removal from water by MoS 2 with widened interlayer spacing was systematically investigated in comparison with pure MoS 2 . A series of techniques, including X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), and Brunauer–Emmett–Teller (BET) surface area and porosimetry analysis were applied to characterize the nanocomposites. The XRD results confirmed the enlarged interlayer spacing of MoS 2 by intercalating cetyl trimethyl ammonium bromide (CTAB) into the interlamination. The maximum adsorption capacities of Cr(VI) and Ni(II) for MoS 2 /CTAB were 79.4 mg g −1 and 88.3 mg g −1 , respectively. Moreover, a synergistic effect in the simultaneous removal of Cr(VI) and Ni(II) was observed. A new Cr(VI) removal mechanism involving redox reaction between Cr(VI) and Mo(IV) in MoS 2 /CTAB was verified. The removal efficiencies of Cr(VI) and Ni(II) still remained high at the end of fifth cycle, indicating that MoS 2 /CTAB has a great potential to remove heavy metals from wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhenggang Jia,Xuexi Zhang,Mingfang Qian,Siyao Ma,Yingmin Jin,Yueping Xiong
The shuttling of polysulfide intermediates and volume distortion during cycling make it challenging for the applications of MoS 2 at high current densities without capacity fading. In order to improve the cycle life and rate capability of lithium-ion batteries, introducing a porous matrix is a viable strategy. Here, MoS 2 with 3D porous graphene prepared by low-temperature hydrothermal (160 °C) and low-energy ultrasound-assisted (40 W for 120 s) methods shows no impurities, large layer thickness (0.94 nm, 54 % increase) and no bare MoS 2 , resulting in smaller volume expansion (34 % in Li 4 MoS 2 ), higher lithium stability (0.66 eV of adsorption energy) and more convenient ion transport channels. The first-principles calculations show that more lithium can be inserted without destroying the layered structure by forming a lithium metal layer between the MoS 2 layers. The encapsulation of graphene not only hinders the shuttle effect of sulfur, but also improves the adsorption energy of lithium atoms in the electrode. In addition, electrochemical analysis shows that the clear drop in charge transfer resistance (Rct) in the first 300 cycles also indicates the improvement of the reaction pathway by graphene. As a result, the as-prepared rGO/MoS 2 still maintains a specific capacity of 1008 mAh·g −1 with a very low capacity decay rate (0.03 % per cycle) at a current density of 1 A·g −1 after 500 cycles as an electrode material for lithium-ion batteries.
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危险品化学品经营许可证（带存储）