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Molybdenum

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https://www.readbyqxmd.com/read/28524651/electrodeposited-mo3s13-films-from-nh4-2mo3s13%C3%A2-2h2o-for-electrocatalysis-of-hydrogen-evolution-reaction
#1
Kuangzhou Du, Lirong Zheng, Tanyuan Wang, Junqiao Zhuo, Zhiwei Zhu, Yuanhua Shao, Meixian Li
Molybdenum sulfides are considered to be one kind of the promising candidates as cheap and efficient electrocatalysts for hydrogen evolution reaction (HER). But this is still a gap on electrocatalytic performance toward Pt. In order to further enhance electrocatalytic activity of molybdenum sulfides, in this work, Mo3S13 films with high ratio of sulfur to molybdenum were prepared by electrodeposition. The Mo3S13 films exhibit highly efficient electrocatalytic activity for HER and achieve a current density of 10 mA/cm2 at an overpotential of 200 mV with an onset potential of 130 mV vs...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524215/-novel-therapies-in-neurometabolic-diseases-the-importance-of-early-intervention
#2
L G Gutierrez-Solana
INTRODUCTION: Individually, neurometabolic diseases are ultra rare, but for some of them there is an effective treatment. DEVELOPMENT: Several recent therapeutic advances are reviewed. Today, the possibilities of treatment for lysosomal diseases have improved. In recent years the use of enzyme replacement therapy has become more widely extended to treat mucopolysaccharidosis type IVA (Morquio A), mucopolysaccharidosis type VII (Sly syndrome), lysosomal acid lipase deficiency and alpha-mannosidosis...
May 17, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28523865/the-interstitial-carbon-of-the-nitrogenase-femo-cofactor-is-far-better-stabilized-than-previously-assumed
#3
Jörg Grunenberg
The first quantum-mechanical calculations of all relevant potential constants in both the iron-molybdenum cofactor and the iron-vanadium cofactor of nitrogenase suggest that the carbide is bound to the center of the enzyme much more strongly than hitherto assumed. Previous studies seemed to indicate a dummy function of the interstitial carbon, with a weak force constant (ca. 0.32 N cm(-1) ). Our new investigations confirm a different picture: the central carbon atom binds the iron-sulfur cluster through six covalent C-Fe bonds...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28516988/syntheses-and-catalytic-oxotransfer-activities-of-oxo-molybdenum-vi-complexes-of-a-new-aminoalcohol-phenolate-ligand
#4
M K Hossain, M Haukka, R Sillanpää, D A Hrovat, M G Richmond, E Nordlander, A Lehtonen
The new aminoalcohol phenol 2,4-di-tert-butyl-6-(((2-hydroxy-2-phenylethyl)amino)methyl)phenol (H2L) was prepared by a facile solvent-free synthesis and used as a tridentate ligand for new cis-dioxomolybdenum(vi)(L) complexes. In the presence of a coordinating solvent (DMSO, MeOH, pyridine), the complexes crystallise as monomeric solvent adducts while in the absence of such molecules, a trimer with asymmetric Mo[double bond, length as m-dash]O→Mo bridges crystallises. The complexes can catalyse epoxidation of cis-cyclooctene and sulfoxidation of methyl-p-tolylsulfide, using tert-butyl hydroperoxide as oxidant...
May 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28516986/single-layer-mos2-formation-by-sulfidation-of-molybdenum-oxides-in-different-oxidation-states-on-au-111
#5
Norberto Salazar, Igor Beinik, Jeppe V Lauritsen
The sulfidation of a MoO3 precursor into MoS2 is an important step in the preparation of catalysts for the hydrodesulfurization process that is widely utilized in oil refineries. Molybdenum oxides are also the most commonly used precursors for MoS2 growth in, e.g., the synthesis of novel two-dimensional materials. In the present study, we investigate the transformation of MoOx into MoS2 on a model Au(111) surface through sulfidation in H2S gas atmosphere using in situ scanning tunneling microscopy and X-ray photoemission spectroscopy...
May 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28514699/profiling-of-illicit-cocaine-seized-in-china-by-icp-ms-analysis-of-inorganic-elements
#6
Cuimei Liu, Zhendong Hua, Xin Meng
For the first time in China, the inorganic element profiling of cocaine specimens was performed at the National Narcotics Laboratory. An inductive coupled plasma-mass spectrometry (ICP-MS) method was developed and validated for simultaneous analysis of 26 inorganic elements, including sodium (Na), magnesium (Mg), aluminuim (Al), potassium (K), calcium (Ca), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), molybdenum (Mo), silver (Ag), cadmium (Cd), antimony (Sb), barium (Ba), lanthanum (La), cerium (Ce), thallium (Tl), lead (Pb), thorium (Th), and uranium (U) in illicit cocaine samples...
April 29, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28513434/a-unifying-mechanism-for-the-biogenesis-of-membrane-proteins-co-operatively-integrated-by-the-sec-and-tat-pathways
#7
Fiona J Tooke, Marion Babot, Govind Chandra, Grant Buchanan, Tracy Palmer
The majority of multi-spanning membrane proteins are co-translationally inserted into the bilayer by the Sec pathway. An important subset of membrane proteins have globular, cofactor-containing extracytoplasmic domains requiring the dual action of the co-translational Sec and post-translational Tat pathways for integration. Here, we identify further unexplored families of membrane proteins that are dual Sec-Tat-targeted. We establish that a predicted heme-molybdenum cofactor-containing protein, and a complex polyferredoxin, each require the concerted action of two translocases for their assembly...
May 17, 2017: ELife
https://www.readbyqxmd.com/read/28512314/water-assisted-synthesis-of-molybdenum-disulfide-film-with-single-organic-liquid-precursor
#8
Soo Ho Choi, Boandoh Stephen, Ji-Hoon Park, Joo Song Lee, Soo Min Kim, Woochul Yang, Ki Kang Kim
We report on the synthesis of large-area molybdenum disulfide (MoS2) film on an insulating substrate by means of chemical vapor deposition. A single mixture of molybdenum hexacarbonyl (Mo(CO)6) and dimethyl disulfide (C2H6S2) was utilized as an organic liquid precursor for the synthesis of MoS2 film. Carbon impurities stemming from the dissociation of the organic precursor are effectively removed by water oxidation, and hydrogen gas, which is a by-product of the oxidation of carbon impurities, inhibits the formation of molybdenum oxides...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28511533/composition-morphology-and-topography-of-galvanic-coatings-fe-co-w-and-fe-co-mo
#9
Iryna Yu Yermolenko, Maryna V Ved, Nykolay D Sakhnenko, Yulya I Sachanova
Ternary coatings Fe-Co-W with an iron content of 40-55 at.%, cobalt 39-44 at.%, and tungsten 4-12 at.% and Fe-Co-Mo with an iron content of 40-55 at.%, cobalt 39-44 at.%, and tungsten 4-12 at.% were obtained by galvanostatic and pulse electrolysis on the mild steel substrate from iron(III) citrate-based electrolyte. The influence of electrolysis mode and parameters on composition of deposited alloys was studied. The competing reduction of iron and tungsten in Fe-Co-W coatings as well as the competitive deposition of iron and cobalt in Fe-Co-Mo coatings at various current densities were defined...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28510441/molybdenum-carbamate-nanosheets-as-a-new-class-of-potential-phase-change-materials
#10
Maksym Zhukovskyi, Vladimir V Plashnitsa, Nattasamon Petchsang, Anthony Ruth, Anshumaan Bajpai, Felix Vietmeyer, Yuanxing Wang, Michael Brennan, Yunsong Pang, Kalpani Werellapatha, Bruce A Bunker, Soma Chattopadhyay, Tengfei Luo, Boldizsar Janko, Patrick Fay, Masaru Kuno
We report, for the first time, the synthesis of large, free-standing, Mo2O2(µ-S)2(Et2dtc)2 (MoDTC) nanosheets (NSs), which exhibit an electron-beam induced crystalline-to-amorphous phase transition. Both electron beam ionization and femtosecond (fs) optical excitation induce the phase transition, which is size-, morphology- and composition-preserving. Resulting NSs are the largest, free standing regularly-shaped two-dimensional amorphous nanostructures made to date. More importantly, amorphization is accompanied by dramatic changes to the NS electrical and optical response wherein resulting amorphous species exhibit room temperature conductivities 5 orders of magnitude larger than those of their crystalline counterparts...
May 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28509561/lattice-and-valence-electronic-structures-of-crystalline-octahedral-molybdenum-halide-clusters-based-compounds-cs2-mo6x14-x-cl-br-i-studied-by-density-functional-theory-calculations
#11
Norio Saito, Stéphane Cordier, Pierric Lemoine, Takeo Ohsawa, Yoshiki Wada, Fabien Grasset, Jeffrey S Cross, Naoki Ohashi
The electronic and crystal structures of Cs2[Mo6X14] (X = Cl, Br, I) cluster-based compounds were investigated by density functional theory (DFT) simulations and experimental methods such as powder X-ray diffraction, ultraviolet-visible spectroscopy, and X-ray photoemission spectroscopy (XPS). The experimentally determined lattice parameters were in good agreement with theoretically optimized ones, indicating the usefulness of DFT calculations for the structural investigation of these clusters. The calculated band gaps of these compounds reproduced those experimentally determined by UV-vis reflectance within an error of a few tenths of an eV...
May 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28509535/molybdenum-tungsten-mixed-oxide-deposited-into-titanium-dioxide-nanotube-arrays-for-ultrahigh-rate-supercapacitors
#12
He Zhou, Xiaopeng Zou, Kaikai Zhang, Peng Sun, Md Suzaul Islam, Jianyu Gong, Yanrong Zhang, Jiakuan Yang
A novel method involving the fabrication of Mo-W mixed oxide (MoxW1-xO3) is proposed to modify the modest reaction kinetics and poor cycling stability of MoO3 material. By a simple co-electrodeposition method, a series of MoxW1-xO3 oxides is deposited on a TiO2 nanotube array substrate. Due to the differences between Mo6+ and W6+ in nature, there is significant distortion existing in the mixed oxides, leading to their decreased crystallite size and enlarged lattice space, which facilitates ion diffusion in the solid...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508628/defect-dominated-charge-transport-and-fermi-level-pinning-in-mos2-metal-contacts
#13
Pantelis Bampoulis, Rik Van Bremen, Qirong Yao, Bene Poelsema, Harold J W Zandvliet, Kai Sotthewes
Understanding the electronic contact between molybdenum disulfide (MoS2) and metal electrodes is vital for the realization of future MoS2-based electronic devices. Natural MoS2 suffers from a high density of both metal and sulfur defects and impurities. We present evidence that subsurface metal-like defects with a density of ∼10(11) cm(-2) induce a negative ionization of the outermost S atom complex. We investigate with high spatial resolution surface characterization techniques the effect of these defects on the local conductance of MoS2...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508585/exploring-the-molecular-growth-of-two-gigantic-half-closed-polyoxometalate-clusters-mo180-and-mo130ce6
#14
Lee Cronin, Weimin Xuan, Robert Pow, De-Liang Long
Understanding the process of the self-assembly of gigantic polyoxometalates and their subsequent molecular growth, by the addition of capping moieties onto the oxo-frameworks, is critical for the development of the designed assembly of complex high nuclearity cluster species, yet such processes remain far from being understood. Here we describe that the molecular growth from {Mo150} and {Mo120Ce6} to afford two half-closed gigantic molybdenum blue clusters {Mo180} (1) and {Mo130Ce6} (2), respectively. 1 features a hat-shaped structure with the parent wheel-shaped {Mo150} being capped by a {Mo30} unit on one side...
May 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28507721/mo-6-activated-multimetal-oxygen-evolving-catalysts
#15
Peng Fei Liu, Shuang Yang, Li Rong Zheng, Bo Zhang, Hua Gui Yang
Water splitting is key to electrically-powered chemical fuel synthesis, but the slow kinetics of the oxygen evolution reaction (OER) hinder the wider promotion of such technology. Several first-row (3d) transition metal-based catalysts have been developed for the OER; however, these catalysts still require operating voltages that lie well above the fundamental thermodynamic potential. Here, we report high-valence metal molybdenum (Mo(6+)) modulated 3d metal (oxy)hydroxides. The obtained multimetal FeCoMo based OER catalysts require an overpotential of 277 mV to reach the current density of 10 mA cm(-2) on the glassy carbon electrode, and there was no evidence of degradation for about 40 hours of stability testing...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28505530/photocatalytic-wastewater-purification-with-simultaneous-hydrogen-production-using-mos2-qd-decorated-hierarchical-assembly-of-znin2s4-on-reduced-graphene-oxide-photocatalyst
#16
Shuqu Zhang, Longlu Wang, Chengbin Liu, Jinming Luo, John Crittenden, Xia Liu, Tao Cai, Jili Yuan, Yong Pei, Yutang Liu
It is attractive to photocatalytically purify wastewater and simultaneously convert solar energy into clean hydrogen energy. However, it is still a challenge owing to the relatively low photocatalytic efficiency of photocatalysts. In this study, we synthesized a molybdenum disulfide (MoS2) quantum dot-decorated 3D nanoarchitecture (MoS2QDs) of indium zinc sulfide (ZnIn2S4) and reduced grapheme oxide (MoS2QDs@ZnIn2S4@RGO) photocatalyst using a simple solvothermal method. The RGO promotes the electron transfer, and the highly dispersed MoS2QDs provides numerous catalytic sites...
May 10, 2017: Water Research
https://www.readbyqxmd.com/read/28505419/copper-zinc-tin-sulfide-thin-films-via-annealing-of-ultrasonic-spray-deposited-nanocrystal-coatings
#17
Bryce A Williams, Nancy D Trejo, Albert Wu, Collin S Holgate, Lorraine F Francis, Eray S Aydil
Thin polycrystalline films of the solar absorber copper zinc tin sulfide (CZTS) were formed by annealing coatings deposited on molybdenum-coated soda lime glass via ultrasonic spraying of aerosol droplets from colloidal CZTS nanocrystal dispersions. Production of uniform continuous nanocrystal coatings with ultrasonic spraying requires that the evaporation time is longer than the aerosol flight time from the spray nozzle to the substrate such that the aerosol droplets still have low enough viscosity to smooth the impact craters that form on the coating surface...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28502322/high-prevalence-of-elevated-molybdenum-levels-in-pediatric-ckd-patients-a-cross-sectional-and-longitudinal-study%C3%A2
#18
Guido Yang, Vladimir Belostotsky, Marta Kobrzynski, Shih-Han S Huang, Liju Yang
AIMS: Many of the secondary effects of high levels of molybdenum (Mo) overlap with symptoms commonly seen in pediatric patients with chronic kidney disease (CKD). We measured plasma Mo levels and examined the relationship between Mo levels and kidney function. MATERIALS AND METHODS: The study was carried out at the London Health Sciences Centre in London, Ontario, Canada with 36 children and adolescents 4 - 18 years of age with CKD. There were 1 - 6 trace element measurements (Mo and copper (Cu)) per patient...
May 15, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28500584/specific-interactions-of-antitumor-metallocenes-with-deoxydinucleoside-monophosphates
#19
Rahel P Eberle, Yvonne Hari, Stefan Schürch
Bent metallocenes Cp2MCl2 (M = Ti, V, Nb, Mo) are known to exhibit cytotoxic activity against a variety of cancer types. Though the mechanism of action is not fully understood yet, the accumulation of the metal ions in the nucleus points towards DNA as one of the primary targets. A set of eight deoxydinucleoside monophosphates was used to study the adduct yields with metallocenes and cisplatin. The binding affinities are reflected by the relative intensities of the adducts and were found to follow the order of Pt > V > Ti > Mo (no adducts were detected with Nb)...
May 12, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28497908/the-molybdenum-cofactor-enzyme-marc-moonlighting-or-promiscuous-enzyme
#20
REVIEW
Angel Llamas, Alejandro Chamizo-Ampudia, Manuel Tejada-Jimenez, Aurora Galvan, Emilio Fernandez
Molybdenum (Mo) is present in the active center of eukaryotic enzymes as a tricyclic pyranopterin chelate compound forming the Mo Cofactor (Moco). Four Moco containing enzymes are known in eukaryotes, nitrate reductase (NR), sulfite oxidase (SO), xanthine oxidoreductase (XOR), and aldehyde oxidase (AO). A fifth Moco enzyme has been recently identified. Because of the ability of this enzyme to convert by reduction several amidoximes prodrugs into their active amino forms, it was named mARC (mitochondrial Amidoxime Reducing Component)...
May 12, 2017: BioFactors
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