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PubMed Journals Articles About "MoS2 Nanoflowers Derived Interconnected CoMoO4 Nanoarchitectures Stable High" RSS

16:00 EDT 1st April 2020 | BioPortfolio

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Showing "MoS2 Nanoflowers Derived Interconnected CoMoO4 Nanoarchitectures Stable High" PubMed Articles 1–25 of 39,000+

MoS2 Nanoflowers Derived Interconnected CoMoO4 Nanoarchitectures as Stable and High Rate Performing Anode for Lithium Ion Battery Applications.

In recent years, conversion based mixed transition metal oxides have emerged as potential anode for the next generation lithium ion batteries due to their high theoretical capacity and high rate performance. Herein, an interconnected cobalt molybdenum oxide (CoMoO4) nanoarchitecture derived from molybdenum sulfide (MoS2) nanoflowers is investigated as an anode for lithium ion batteries. The interconnected CoMoO4 displayed excellent discharge capacity of 1100 mAh g-1 over 100 cycles at current rate of C/5. M...


One-pot Hydrothermal Synthesis of Ternary 1T-MoS2/Hexa-WO3/Graphene Composites for High-Performance Supercapacitors.

A new ternary composite of 1T-molybdenum disulphide, hexagonal tungsten trioxide, and reduced graphene oxide (M-W-rGO) is synthesized by using one-pot hydrothermal process. The synergetic effect of 1T-MoS2 and hexa-WO3 nanoflowers improves the electrochemical performance for supercapacitors by inducing additional active sites and hexagonal tunnels, respectively, which lead to high storage capacity and easy transfer of electrolyte ions. The ternary M-W-rGO composite has a high specific capacitance of 836 F g...

Nanostructured MoO2/MoS2/MoP heterojunction electrocatalyst for hydrogen evolution reaction.

Electrocatalytic production of hydrogen from water is considered to be a promising and sustainable strategy. In this work, the low-cost nanostructured MoO2/MoS2/MoP heterojunction is successfully synthesized by phosphorization of the pre-prepared urchin-like MoO2/MoS2 nanospheres as the stable, high efficient electrocatalysis for HER. The MoO2/MoS2/MoP-800 (MoO2/MoS2 nanospheres are phosphated at 800 oC) displays a catalytic ability for HER with an overpotential of 135 mV to achieve 10 mA cm-2 and Tafel slo...


Deep Phase Transition of MoS2 for Excellent Hydrogen Evolution Reaction by Facile C-doping Strategy.

Metallic 1T-phase MoS2 is considered as an ideal electrocatalyst for hydrogen evolution reaction (HER) on account of abundant active sites and favorable conductivity compare to 2H-phase MoS2. Nevertheless, the conventional synthesis of 1T-phase MoS2 is complicated and the product is unstable, which hinder their practical applications. Herein, we propose a facile approach through a carbon-doping induced phase transition to obtain highly stable 1T-2H mixed MoS2 nanosheets. The phase transition process is char...

MoS nanoflowers encapsulated into carbon nanofibers containing amorphous SnO as an anode for lithium-ion batteries.

SnO2 with high abundance, large theoretical capacity, and nontoxicity is considered to be a promising candidate for use as advanced electrodes. However, the poor electronic conductivity and large volume variations hinder the practical applications of SnO2-based electrodes for use in lithium-ion batteries (LIBs). Herein, the MoS2-SnO2 heterostructures were encapsulated into carbon nanofibers (CNFs) via facile solvothermal and electrospinning methods. Remarkably, when the binder-free and robust MoS2-SnO2@CNF ...

Mo-doped Zn, Co Zeolitic-Imidazolate Framework-derived Co9S8 Quantum Dots and MoS2 Embedded in Three-Dimensional Nitrogen Doped Carbon Nanoflake Arrays as an Efficient Trifunctional Electrocatalysts for ORR, OER and HER.

Herein, we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in porous carbon nanoflake arrays supported on carbon nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic-imidazolate framework grown on carbon nanofibers and subsequent sulfuration. The electrocatalyst shows high and stable electrocatalytic performance, with half-wave potential of 0.82 V for ORR and overpotential at 10 mA cm-2 for OER (0.34 V) and HER (0.163 V), which outperform the me...

Fabrication of hierarchical SrTiO3@MoS2 heterostructure nanofibers as efficient and low-cost electrocatalyst for hydrogen evolution reaction.

The construction of low-cost, high-performance electrocatalysts instead of platinum catalysts is critical to solving the energy crisis. Here, by simple electrospinning and hydrothermal methods, new MoS2 nanosheets on SrTiO3 nanofibers (NFs) and 2D SrTiO3@MoS2 heterostructure NFs were synthesized. In addition, SrTiO3@MoS2 heterostructure NFs were compared with bare SrTiO3 NFs and MoS2 nanosheets. Importantly, the prepared SrTiO3@MoS2 heterostructure showed better HER performance than other MoS2-based electro...

Binary mixed molybdenum cobalt sulfide nanosheets decorated on rGO as a high-performance supercapacitor electrode.

This work represents the production of MoS2/CoS2 hybridized with rGO as a material for high-performance supercapacitors. The hydrothermal method is used for the synthesis. The as-prepared material is characterized by X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, and electron microscopy. The size of nanoparticles is estimated at 80 nm, and their uniform dispersion on rGO observe from electron microscopy images. A high-specific capacitance of 190 mF cm-2 obtains for MoS2/CoS2/rGO at the cu...

Controlled growth of MoS2 via surface-energy alterations.

Monolayer MoS2 in triangular configurations with rich edges or high-quality uniform films are either catalytically active for the hydrogen evolution reaction or flexible for functional electronic and optoelectronic devices. Here, we have experimentally discovered that these two types of MoS2 products can be selectively synthesized on graphene (Gr) or sapphire (Al2O3) substrates, which are associated with both different adsorption energy and diffusion-energy barrier for vapor precursors during the growth. Ou...

Phase-dependent gas sensitivity of MoS2 chemical sensors investigated with phase-locked MoS2.

In the present study, phase-dependent gas sensitivities of MoS2 chemical sensors were examined. While 1T-phase MoS2 (1T-MoS2) has shown better chemical sensitivity than has 2H-phase MoS2 (2H-MoS2), the instability of the 1T phase has been hindering applications of 1T-MoS2 as chemical sensors. Here, the chemical sensitivity of MoS2 locked in its 1T phase by using a ZnO phase lock was investigated. To develop MoS2 chemical sensors locked in the 1T phase, we synthesized a multi-dimensional nanomaterial by grow...

Long-term stability of multilayer MoS2 transistors with mica gate dielectric.

To avoid surface damage of MoS2 channel, mica flake with high permittivity and atomically flat surface was dry transferred onto a multilayer MoS2 flake to prepare top-gated transistors. For the first time, the interface properties of mica/MoS2 and the long-term stability of devices were investigated when the transistors were exposed to ambient air. Results showed that the electrical performance of the transistors is degraded significantly when the devices are exposed to ambient moisture for a long time due ...

Efficient Synthesis and Characterization of Robust MoS2 and S Cathode for Advanced Li-S Battery: Combined Experimental and Theoretical Studies.

Here, we report, in-situ MoS2 and S cathode (MGC) prepared by simple decomposition of (NH4)2MoS4 facilitate direct formation of Li2S eliminating long term problem associated with polysulphide shuttling in Li-S batteries. For comparison, we prepared ex-situ MoS2 and S cathode (EMS) with similar S:MoS2 mole ratio to that of in-situ prepared cathode. Discharge capacity of EMS cathode dropped by 80 % after first few cycles, while assembled MGC cell demonstrated an initial discharge capacity of 1649 mAh/g, achie...

One-step H2S reactive sputtering for 2D MoS2/Si heterojunction photodetector.

A technique for directly growing two-dimensional (2D) materials onto conventional semiconductor substrates, enabling high-throughput and large-area capability, is required to realise competitive 2D transition metal dichalcogenide devices. A reactive sputtering method based on H2S gas molecules and sequential in-situ post-annealing treatment in the same chamber was proposed to compensate for the relatively deficient sulfur atoms in the sputtering of MoS2 and then applied to a 2D MoS2/p-Si heterojunction phot...

A modified wrinkle-free MoS2 film transfer method for large area high mobility field-effect transistor.

Wrinkle-free transfer of chemical vapor deposition (CVD) synthesized 2D MoS2 is a prerequisite for large area high-performance device fabrication. The surface-energy-assisted transfer method is a suitable method for MoS2 transfer, which greatly reduces the damage to MoS¬2. However, in the process of tiling MoS2 to the new substrate, the droplets sandwiched between MoS2 and substrate, which is difficult to remove and easy to cause wrinkles and cracks. To realize no wrinkles and cracks transfer, we developed...

Controlled Covalent Functionalization of 2H-MoS2 with Molecular or Polymeric Adlayers.

Air-stable 2D materials are relatively inert, which makes their chemical modification difficult. In the case of MoS2, the semiconducting 2H-MoS2 is much less reactive than its metallic counterpart, 1T-MoS2. As a consequence, there are very few methods for the covalent modification of 2H-MoS2. An ideal method for the functionalization of 2H-MoS2 should be mild, without introduction of a large number of defects, and versatile, allowing for the decoration with as many different functional groups as possible....

Sulfur Vacancy-rich O-doped 1T-MoS2 Nanosheets for Exceptional Photocatalytic Nitrogen Fixation over CdS.

Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts owns sulfur vacancies, O-doping, more metallic 1T phase and high electronic conductivity, thus leading to exposure of more active edge sites, high BET surface area, enhanced visible light absorption, and improved electron separation and transfer, that are beneficial for photocataly...

A facile one-step synthesized epsilon-MnO nanoflowers for effective removal of lead ions from wastewater.

The increasing contamination of lead ions (Pb(II)) in groundwater has become a serious environmental issue, which provides the impetus for intense research on Pb(II) removal. ε-MnO nanoflowers were successfully fabricated through a simple decomposition reaction. And the obtained ε-MnO nanoflowers were employed to remove Pb(II) from water. The detailed microstructure and surface properties of ε-MnO were systematically characterized. The results indicate that the pure ε-MnO phase was obtained and the spec...

Plasma-Induced Exfoliation Provides Onion-like Graphene-Surrounded MoS2 Nanosheets for Highly Efficient Hydrogen Evolution Reaction.

With the goal of obtaining sustainable earth-abundant electrocatalyst materials displaying high performance in the hydrogen evolution reaction (HER), here we propose a facile one-pot plasma-induced electrochemical process for the fabrication of new core-shell structures of ultrathin MoS2 nanosheets engulfed within onion-like graphene nanosheets (OGNs@MoS2). The resultant OGNs@MoS2 structures not only increased the number of active sites of the semiconducting MoS2 nanosheets but also enhanced their conductiv...

Recent advances in synthesis and biosensors of two-dimensional MoS2.

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted tremendous research interests due to their exciting optical properties, large surface area, intercalatable morphologies, and excellent electrochemically catalytic activity. Acting as the most typical member in TMDCs family, layer-dependent molybdenum disulfide (MoS2) with a particular direct band gap of 1.8 eV in monolayer has been widely applied in various biosensors with high sensitivity and selectivity. In this review, the prepa...

Modified p-GaN Micro-wells with Vertically Aligned 2D-MoS2 for Enhanced Photoelectrochemical Water-Splitting.

Photoelectrochemical (PEC) water splitting has been considered as of the future technology to store solar-energy in the chemical-bonds. However, due to the search of ideal heterostructured materials for photoanode/cathode, the full potential of this technology has not been realized yet. Herein we present, nanotextured hexagonal micro-well of p-GaN [p-GaN(Et)] synthesized via wet chemical etching route as a photocathode (PC) for PEC water splitting. The p-GaN(Et) was further modified by interconnected nanowa...

Untapped potential of polymorph MoS2: Tuned cationic intercalation for high-performance symmetric supercapacitors.

Supercapacitors have been the key target as energy storage devices of modern technology that needs fast charging. Although supercapacitors have large power density, modifications should be done to manufacture electrodes with high energy density, longer stability, and simple device structure. The polymorph MoS2 has been one of the targeted materials for supercapacitor electrodes. However, it was hard to tune its phase and stability to achieve the maximum possible efficiency. Herein, we demonstrate the effect...

Capacitive Deionization of Saline Water by Using MoS2-Graphene Hybrid Electrodes with High Volumetric Adsorption Capacity.

Capacitive deionization (CDI) has received wide attention as an emerging water treatment technology due to its low energy consumption, low cost and high efficiency. However, the conventional carbon electrode materials for CDI have low densities, which occupy large volumes and are disadvantageous for use in limited space (e.g., in household or on offshore platforms). In order to miniaturize the CDI device, it is quite urgent to develop high volumetric adsorption capacity (VAC) electrode materials. To overcom...

Mechanism of highly enhanced hydrogen storage by two-dimensional 1T' MoS.

Hydrogen energy is a high-efficiency and clean energy, but the problem of storage still prevents its extensive use. Large-surface-area, two-dimensional (2D) layered materials have an advantage in hydrogen storage applications. Monolayer MoS2 is a typical 2D material that has been widely studied recently. And the 1T' phase of MoS2 is a focus especially for studies concerning hydrogen. Here, first-principles calculations are carried out to investigate the adsorption behaviors of hydrogen molecules on 1T' MoS2...

Large-Scale Synthesis of MOF-Derived Superporous Carbon Aerogels with Extraordinary Adsorption Capacity for Organic Solvents.

Carbon aerogels (CAs) with 3D interconnected networks hold promise for application in areas such as pollutant treatment, energy storage, and electrocatalysis. In spite of this, it remains challenging to synthesize high-performance CAs on a large scale in a simple and sustainable manner. We report an eco-friendly method for the scalable synthesis of ultralight and superporous CAs by using cheap and widely available agarose (AG) biomass as the carbon precursor. Zeolitic imidazolate framework-8 (ZIF-8) with hi...

Vertical Heterostructure of SnS-MoS2 Synthesized by Sulfur-Preloaded Chemical Vapor Deposition.

The composition of p-n junction is required by application requires efficacious charge separation. A vertical heterostructure (HS) between tin sulfide (SnS) and molybdenum sulfide (MoS2) is synthesized by chemical vapor deposition, basing on the preferential adsorption of sulfur on MoS2. Most of the SnS grains nucleate on MoS2 nanosheets, formatting partially stacked HS with large overlapping regions. Photoluminescence quenching of MoS2 is observed, and illustrates effective charge separation in HS. The HS ...


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